[UNIX] Zebra and Quagga Remote DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 11/16/03

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Date: 16 Nov 2003 18:35:24 +0200

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      Zebra and Quagga Remote DoS
    ------------------------------------------------------------------------

    SUMMARY

    A remote DoS condition exists in Zebra and/or Quagga when layer 3 access
    is possible to the telnet management port (2601/tcp or 2605/bgpd). The
    vulnerability can be recreated by sending a telnet option delimiter with
    no actual option data. This will cause a bad memory call and SIGSEV.

    DETAILS

    Vulnerable systems:
     * GNU Zebra and all versions of Quagga prior to 0.96.4

    Workaround:
    Restrict access to daemon's telnet CLI, by either configuring each
    daemon's vty with an appropriate access-class and access-list, or by some
    external firewalling application.

    Alternatively, disable external vty access completely by removing the vty
    password (and restarting) or passing the '-P 0' parameters to the daemon.

    Steps to Reproduce:
    1. Run Zebra on a machine.
    2. From another machine run: printf '\xff\xf0\xff\xf0\xff\xf0' | nc
    <zebra-host> 2601
    3. Zebra dies.

    Solution:
    Quagga version 0.96.4 contains a fix for this bug. Alternatively, one can
    manually apply the fix to whichever sources one uses currently. See the
    RedHat Bugzilla entry referenced for the fix
    <http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=107140>
    http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=107140.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:jonny@prophecy.net.nz> Jonny
    Robertson and <mailto:paul@clubi.ie> Paul Jakma.

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