[NEWS] Buffer Overflow in Netware Web Server PERL Handler

From: SecuriTeam (support_at_securiteam.com)
Date: 07/23/03

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Date: 23 Jul 2003 17:49:20 +0200

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      Buffer Overflow in Netware Web Server PERL Handler
    ------------------------------------------------------------------------

    SUMMARY

    The Netware Enterprise Server does not perform proper bounds check on
    requests passed to the PERL interpreter through the PERL virtual
    directory. This results in a buffer overflow condition, when large
    requests are sent to the PERL interpreter.

    DETAILS

    Vulnerable systems:
     * Netware 5.1 SP6
     * Netware 6

    The issue can be triggered by requesting the PERL virtual directory
    followed by a long string.
    http://server/perl/aaaaaa...[Unspecified number of characters]

    The vulnerability occurs in the CGI2PERL.NLM module.

    Impact:
    A request as shown above will overrun the allocated buffer and overwrite
    EIP, causing the server to ABEND and either suspend the process or restart
    itself, thereby creating a Denial of Service situation.

    Corrective actions:
    Novell has made a patch for this issue:
    <http://support.novell.com/servlet/tidfinder/2966549>
    http://support.novell.com/servlet/tidfinder/2966549

    ADDITIONAL INFORMATION

    The original advisory can be downloaded from:
     <http://www.protego.dk/advisories/200301.html>
    http://www.protego.dk/advisories/200301.html

    The information has been provided by <mailto:uni@protego.dk> Uffe
    Nielsen.

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