===================================================================== CERT-Renater Note d'Information No. 2004/VULN571 _____________________________________________________________________ DATE : 23/12/2004 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Systems runninp PHP versions prior to 4.3.10. ====================================================================== - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200412-14 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: PHP: Multiple vulnerabilities Date: December 19, 2004 Bugs: #74547 ID: 200412-14 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Several vulnerabilities were found and fixed in PHP, ranging from an information leak and a safe_mode restriction bypass to a potential remote execution of arbitrary code. Background ========== PHP is a general-purpose scripting language widely used to develop web-based applications. It can run inside a web server using the mod_php module or the CGI version of PHP, or can run stand-alone in a CLI. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-php/php < 4.3.10 >= 4.3.10 2 dev-php/mod_php < 4.3.10 >= 4.3.10 3 dev-php/php-cgi < 4.3.10 >= 4.3.10 ------------------------------------------------------------------- 3 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description =========== Stefan Esser and Marcus Boerger reported several different issues in the unserialize() function, including serious exploitable bugs in the way it handles negative references (CAN-2004-1019). Stefan Esser also discovered that the pack() and unpack() functions are subject to integer overflows that can lead to a heap buffer overflow and a heap information leak. Finally, he found that the way multithreaded PHP handles safe_mode_exec_dir restrictions can be bypassed, and that various path truncation issues also allow to bypass path and safe_mode restrictions. Ilia Alshanetsky found a stack overflow issue in the exif_read_data() function (CAN-2004-1065). Finally, Daniel Fabian found that addslashes and magic_quotes_gpc do not properly escape null characters and that magic_quotes_gpc contains a bug that could lead to one level directory traversal. Impact ====== These issues could be exploited by a remote attacker to retrieve web server heap information, bypass safe_mode or path restrictions and potentially execute arbitrary code with the rights of the web server running a PHP application. Workaround ========== There is no known workaround at this time. Resolution ========== All PHP users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-php/php-4.3.10" All mod_php users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-php/mod_php-4.3.10" All php-cgi users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-php/php-cgi-4.3.10" References ========== [ 1 ] PHP 4.3.10 Release Announcement http://www.php.net/release_4_3_10.php [ 2 ] Hardened-PHP Security Advisory http://www.hardened-php.net/advisories/012004.txt [ 3 ] SEC Consult Advisory http://www.securityfocus.com/archive/1/384663/2004-12-15/2004-12-21/0 [ 4 ] CAN-2004-1019 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1019 [ 5 ] CAN-2004-1065 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1065 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200412-14.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2004 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.0 ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================