[ GLSA 200411-07 ] Proxytunnel: Format string vulnerability

From: Thierry Carrez (koon_at_gentoo.org)
Date: 11/03/04

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To: gentoo-announce@gentoo.org

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    Gentoo Linux Security Advisory GLSA 200411-07
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: Proxytunnel: Format string vulnerability
          Date: November 03, 2004
          Bugs: #69379
            ID: 200411-07

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    Synopsis
    ========

    Proxytunnel is vulnerable to a format string vulnerability, potentially
    allowing a remote server to execute arbitrary code with the rights of
    the Proxytunnel process.

    Background
    ==========

    Proxytunnel is a program that tunnels connections to a remote server
    through a standard HTTPS proxy.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 net-misc/proxytunnel < 1.2.3 >= 1.2.3

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

    Florian Schilhabel of the Gentoo Linux Security Audit project found a
    format string vulnerability in Proxytunnel. When the program is started
    in daemon mode (-a [port]), it improperly logs invalid proxy answers to
    syslog.

    Impact
    ======

    A malicious remote server could send specially-crafted invalid answers
    to exploit the format string vulnerability, potentially allowing the
    execution of arbitrary code on the tunnelling host with the rights of
    the Proxytunnel process.

    Workaround
    ==========

    You can mitigate the issue by only allowing connections to trusted
    remote servers.

    Resolution
    ==========

    All Proxytunnel users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=net-misc/proxytunnel-1.2.3"

    References
    ==========

      [ 1 ] CAN-2004-0992
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0992
      [ 2 ] Proxytunnel News
            http://proxytunnel.sourceforge.net/news.html

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

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

      http://security.gentoo.org/glsa/glsa-200411-07.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 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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