- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200503-02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: phpBB: Multiple vulnerabilities Date: March 01, 2005 Bugs: #82955 ID: 200503-02 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Several vulnerabilities allow remote attackers to gain phpBB administrator rights or expose and manipulate sensitive data. Background ========== phpBB is an Open Source bulletin board package. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 www-apps/phpBB < 2.0.13 >= 2.0.13 Description =========== It was discovered that phpBB contains a flaw in the session handling code and a path disclosure bug. AnthraX101 discovered that phpBB allows local users to read arbitrary files, if the "Enable remote avatars" and "Enable avatar uploading" options are set (CAN-2005-0259). He also found out that incorrect input validation in "usercp_avatar.php" and "usercp_register.php" makes phpBB vulnerable to directory traversal attacks, if the "Gallery avatars" setting is enabled (CAN-2005-0258). Impact ====== Remote attackers can exploit the session handling flaw to gain phpBB administrator rights. By providing a local and a remote location for an avatar and setting the "Upload Avatar from a URL:" field to point to the target file, a malicious local user can read arbitrary local files. By inserting "/../" sequences into the "avatarselect" parameter, a remote attacker can exploit the directory traversal vulnerability to delete arbitrary files. A flaw in the "viewtopic.php" script can be exploited to expose the full path of PHP scripts. Workaround ========== There is no known workaround at this time. Resolution ========== All phpBB users should upgrade to the latest available version: # emerge --sync # emerge --ask --oneshot --verbose ">=www-apps/phpBB-2.0.13" References ========== [ 1 ] CAN-2005-0258 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0258 [ 2 ] CAN-2005-0259 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0259 [ 3 ] phpBB announcement http://www.phpbb.com/phpBB/viewtopic.php?f=14&t=267563 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200503-02.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 2005 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