[ GLSA 200406-07 ] Subversion: Remote heap overflow

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 06/11/04

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    Date: Thu, 10 Jun 2004 23:16:02 +0000
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    Gentoo Linux Security Advisory GLSA 200406-07
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                                                http://security.gentoo.org/
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      Severity: High
         Title: Subversion: Remote heap overflow
          Date: June 10, 2004
            ID: 200406-07

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    Synopsis
    ========

    Subversion is vulnerable to a remote Denial of Service that may be
    exploitable to execute arbitrary code on the server running svnserve.

    Background
    ==========

    Subversion is a revision control system that aims to be a "compelling
    replacement for CVS". It enjoys wide use in the open source community.
    svnserve allows access to Subversion repositories using URIs with the
    svn://, svn+ssh://, and other tunelled svn+*:// protocols.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 dev-util/subversion <= 1.0.4 >= 1.0.4-r1

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

    The svn protocol parser trusts the indicated length of a URI string
    sent by a client. This allows a client to specify a very long string,
    thereby causing svnserve to allocate enough memory to hold that string.
    This may cause a Denial of Service. Alternately, given a string that
    causes an integer overflow in the variable holding the string length,
    the server might allocate less memory than required, allowing a heap
    overflow. This heap overflow may then be exploitable, allowing remote
    code execution. The attacker does not need read or write access to the
    Subversion repository being served, since even un-authenticated users
    can send svn protocol requests.

    Impact
    ======

    Ranges from remote Denial of Service to potential arbitrary code
    execution with privileges of the svnserve process.

    Workaround
    ==========

    Servers without svnserve running are not vulnerable. Disable svnserve
    and use DAV for access instead.

    Resolution
    ==========

    All users should upgrade to the latest version of Subversion.

        # emerge sync

        # emerge -pv ">=dev-util/subversion-1.0.4-r1"
        # emerge ">=dev-util/subversion-1.0.4-r1"

    References
    ==========

      [ 1 ] CAN-2004-0413
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0413

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

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

         http://security.gentoo.org/glsa/glsa-200406-07.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 Technologies, 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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