[NT] Denial of Service Vulnerability in WU-FTPD

From: SecuriTeam (support_at_securiteam.com)
Date: 03/07/05

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Date: 7 Mar 2005 10:27:49 +0200

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      Denial of Service Vulnerability in WU-FTPD
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.wu-ftpd.org/> Wuarchive-ftpd, more affectionately known as
    WU-FTPD, is a replacement ftp daemon for Unix systems developed at
    Washington University by Chris Myers and later by Bryan D. O'Connor.
    WU-FTPD is the most popular ftp daemon on the Internet, used on many
    anonymous ftp sites all around the world.

    Remote exploitation of an input validation vulnerability in WU-FPTD could
    allow for a denial of service of the system by resource exhaustion.

    DETAILS

    Vulnerable Systems:
     * WU-FPTD version 2.6.2

    The vulnerability specifically exists in the wu_fnmatch() function in
    wu_fnmatch.c. When a pattern containing a '*' character is supplied as
    input, the function calls itself recursively on a smaller substring. By
    supplying a string which contains a large number of '*' characters, the
    system will take a long time to return the results, during which time it
    will be using a large amount of CPU time. After a user logs into the ftpd,
    an attacker can send a simple command which will cause high CPU
    utilization.
    To exploit this vulnerability, a simple ftp client is sufficient. Once
    logged in, either anonymously or as an authenticated user, issuing the
    following command will cause the machine to become less responsive.

    ftp> dir ***************************************************************
             ***************************************************************
             ***************************************************************
             **.*

    By re-connecting and issuing the command multiple times, the system can be
    made completely unresponsive. This may prevent legitimate access to
    services provided by the system for the period of the attack.

    Workaround:
    Consider disabling the ftpd. If this is not viable as an option, consider
    disabling anonymous access. Disabling anonymous access will not prevent
    registered users from exploiting this vulnerability.

    Disclosure Timeline:
     * 02.09.2005 - Initial vendor notification - No response.
     * 02.18.2005 - Additional vendor notification - No response.
     * 02.25.2005 - Public disclosure.

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:idlabs-advisories@idefense.com> iDEFENSE.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=207&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=207&type=vulnerabilities

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