[Full-Disclosure] [ GLSA 200503-02 ] phpBB: Multiple vulnerabilities

From: Thierry Carrez (koon_at_gentoo.org)
Date: 03/01/05

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    Gentoo Linux Security Advisory GLSA 200503-02
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: phpBB: Multiple vulnerabilities
          Date: March 01, 2005
          Bugs: #82955
            ID: 200503-02

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    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

    
    

    
    

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