[ GLSA 200404-03 ] Tcpdump Vulnerabilities in ISAKMP Parsing

From: Joshua J. Berry (condordes_at_gentoo.org)
Date: 04/06/04

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    Gentoo Linux Security Advisory GLSA 200404-03
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                                                 http://security.gentoo.org
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      Severity: High
         Title: Tcpdump Vulnerabilities in ISAKMP Parsing
          Date: March 31, 2004
          Bugs: #38206, #46258
            ID: 200404-03

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    Synopsis
    ========

    There are multiple vulnerabilities in tcpdump and libpcap related to
    parsing of ISAKMP packets.

    Background
    ==========

    Tcpdump is a program for monitoring IP network traffic. Libpcap is a
    supporting library which is responsibile for capturing packets off a
    network interface.

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

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
         net-analyzer/tcpdump <= 3.8.1 >= 3.8.3-r1
         net-libs/libpcap <= 0.8.1-r1 >= 0.8.3-r1

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

    There are two specific vulnerabilities in tcpdump, outlined in [
    reference 1 ]. In the first scenario, an attacker may send a
    specially-crafted ISAKMP Delete packet which causes tcpdump to read
    past the end of its buffer. In the second scenario, an attacker may
    send an ISAKMP packet with the wrong payload length, again causing
    tcpdump to read past the end of a buffer.

    Impact
    ======

    Remote attackers could potentially cause tcpdump to crash or execute
    arbitrary code as the 'pcap' user.

    Workaround
    ==========

    There is no known workaround at this time. All tcpdump users are
    encouraged to upgrade to the latest available version.

    Resolution
    ==========

    All tcpdump users should upgrade to the latest available version.
    ADDITIONALLY, the net-libs/libpcap package should be upgraded.

        # emerge sync

        # emerge -pv ">=net-libs/libpcap-0.8.3-r1"
    ">=net-analyzer/tcpdump-3.8.3-r1"
        # emerge ">=net-libs/libpcap-0.8.3-r1" ">=net-analyzer/tcpdump-3.8.3-r1"

    References
    ==========

      [ 1 ] http://www.rapid7.com/advisories/R7-0017.html
      [ 2 ] http://rhn.redhat.com/errata/RHSA-2004-008.html
      [ 3 ] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0989

    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.
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