[ GLSA 200409-21 ] Apache 2, mod_dav: Multiple vulnerabilities

From: Thierry Carrez (koon_at_gentoo.org)
Date: 09/16/04

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    Gentoo Linux Security Advisory GLSA 200409-21
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: Apache 2, mod_dav: Multiple vulnerabilities
          Date: September 16, 2004
          Bugs: #62626, #63948, #64145
            ID: 200409-21

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    Synopsis
    ========

    Several vulnerabilities have been found in Apache 2 and mod_dav for
    Apache 1.3 which could allow a remote attacker to cause a Denial of
    Service or a local user to get escalated privileges.

    Background
    ==========

    The Apache HTTP server is one of most popular web servers on the
    internet. mod_ssl provides SSL v2/v3 and TLS v1 support for it and
    mod_dav is the Apache module for Distributed Authoring and Versioning
    (DAV).

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-www/apache < 2.0.51 >= 2.0.51
                                                                     < 2.0
      2 net-www/mod_dav <= 1.0.3-r1 >= 1.0.3-r2
        -------------------------------------------------------------------
         2 affected packages on all of their supported architectures.
        -------------------------------------------------------------------

    Description
    ===========

    A potential infinite loop has been found in the input filter of mod_ssl
    (CAN-2004-0748) as well as a possible segmentation fault in the
    char_buffer_read function if reverse proxying to a SSL server is being
    used (CAN-2004-0751). Furthermore, mod_dav, as shipped in Apache httpd
    2 or mod_dav 1.0.x for Apache 1.3, contains a NULL pointer dereference
    which can be triggered remotely (CAN-2004-0809). The third issue is an
    input validation error found in the IPv6 URI parsing routines within
    the apr-util library (CAN-2004-0786). Additionally a possible buffer
    overflow has been reported when expanding environment variables during
    the parsing of configuration files (CAN-2004-0747).

    Impact
    ======

    A remote attacker could cause a Denial of Service either by aborting a
    SSL connection in a special way, resulting in CPU consumption, by
    exploiting the segmentation fault in mod_ssl or the mod_dav flaw. A
    remote attacker could also crash a httpd child process by sending a
    specially crafted URI. The last vulnerabilty could be used by a local
    user to gain the privileges of a httpd child, if the server parses a
    carefully prepared .htaccess file.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All Apache 2 users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=net-www/apache-2.0.51"
        # emerge ">=net-www/apache-2.0.51"

    All mod_dav users should upgrade to the latest version:

        # emerge sync

        # emerge -pv ">=net-www/mod_dav-1.0.3-r2"
        # emerge ">=net-www/mod_dav-1.0.3-r2"

    References
    ==========

      [ 1 ] CAN-2004-0747
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0747
      [ 2 ] CAN-2004-0748
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0748
      [ 3 ] CAN-2004-0751
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0751
      [ 4 ] CAN-2004-0786
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0786
      [ 5 ] CAN-2004-0809
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0809

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200409-21.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/1.0

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