[NEWS] Xitami Malformed Header Request DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 11/26/03

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    To: list@securiteam.com
Date: 26 Nov 2003 19:03:53 +0200

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      Xitami Malformed Header Request DoS
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.xitami.com/> Xitami web server has been found to contain a
    vulnerability that allows remote attackers to cause a denial of service
    against the product by sending the server a malformed header.

    DETAILS

    Vulnerable systems:
     * Xitami version 2.5 and prior

    Xitami has a logical error in the way it handles POST requests. A request
    like this will make the server not respond to any other requests although
    the server still listens to port 80:
    POST /forum/index.php HTTP/1.1
    Referer: Sentryunion
    Accept-Encoding: None
    User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
    Content-Length: 10
    (Long string here)
    0x0D 0x0A
    (Another long string here)

    Vulnerable code:
    The code that handles parsing of the HTTP header doesn't have a good
    logic:
    while(header && *header && *header != '\r')
    {
     header_name = header
     if((header_value=strchr(header_name, ":")) != NULL)
      { ... header++;}
    }

    So if inside the HTTP request the header does not contain a ":" character,
    the while loop will run until the process is manually terminated.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:trihuynh@zeeup.com> Tri
    Huynh.

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