[NEWS] Buffer Overflows in Novell iChain Authentication

From: SecuriTeam (support_at_securiteam.com)
Date: 06/09/03

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    To: list@securiteam.com
Date: 9 Jun 2003 18:45:40 +0200

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      Buffer Overflows in Novell iChain Authentication
    ------------------------------------------------------------------------

    SUMMARY

    The Novell iChain product provides identity-based web security services
    that control access to application and network resources across technical
    and organizational boundaries.

    Buffer overflows allow users without authenticating to crash the iChain
    Server. Due to the nature of the overflow, it is likely that this can lead
    to remote administrative access to the server and thus full access to the
    protected networks.

    DETAILS

    Affected products:
     * Novell iChain Server 2.1 SP2
     * Novell iChain Server 2.2
     * Novell iChain Server 2.2 incl. Field Patch 1 (see details)

    The length of the username is only restricted by the SIZE parameter in the
    HTML forms but not in the iChain proxy itself. This can be exploited
    easily by sending an overly long username in the authentication dialog
    that causes the iChain Server to abend (freeze).

    In iChain 2.2 Field Patch 1 the username has to be at the end of the POST
    parameter list, otherwise iChain only prompts with a message stating
    missing parameters.

    Although we are not aware of any exploits in the wild it seems sure that
    this is being used to gain access in any targeted attack since this
    vulnerability can be found and exploited easily.

    Fixes & Workarounds:
    Novell developed patches ic22fp1a.exe (for iChain 2.2) and ic21fp3.exe
    (for iChain 2.1), available today on Novell's support Web site at
    <http://support.novell.com/filefinder>
    http://support.novell.com/filefinder.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:security@Dunkel.de> Axel
    Dunkel.

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