Joined: 25 Feb 2003
Location: Essen, Germany
|Posted: Tue Mar 01, 2005 6:52 pm Post subject: [ GLSA 200503-02 ] phpBB: Multiple vulnerabilities
|Gentoo Linux Security Advisory
Title: phpBB: Multiple vulnerabilities (GLSA 200503-02)
Exploitable: local and remote
Date: March 01, 2005
Several vulnerabilities allow remote attackers to gain phpBB administrator rights or expose and manipulate sensitive data.
phpBB is an Open Source bulletin board package.
Vulnerable: < 2.0.13
Unaffected: >= 2.0.13
Architectures: All supported architectures
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).
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.
There is no known workaround at this time.
All phpBB users should upgrade to the latest available version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apps/phpBB-2.0.13"
Last edited by GLSA on Sun May 07, 2006 4:55 pm; edited 1 time in total