[NT] Quake 2 Server Format String (Lithium II)

From: SecuriTeam (support_at_securiteam.com)
Date: 09/08/05

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Date: 8 Sep 2005 13:49:57 +0200

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      Quake 2 Server Format String (Lithium II)
    ------------------------------------------------------------------------

    SUMMARY

    " <http://www.planetquake.com/lithium/> Lithium II is a very configurable
    server-side deathmatch modification for Quake II." By crafting a special
    nick name it is possible to cause a format string attack under Quake 2
    Lithium.

    DETAILS

    Vulnerable Systems:
     * Quake 2 Lithium II version 1.2

    Quake 2 Lithium does not not filter the nick name that users selects for
    themselves. Creating a nick name such as %999f%f%f%f%f allow real number
    to overflow their range and cause a carry flag.

    The format string is entered to the stuck as following:
    004144A1 |. 68 E821AF00 PUSH QUAKE2.00AF21E8 ;
    ASCII "0.000000 0.000000 0.000000"

    The format string takes place when a user is been killed, and the server
    caused an invalid page fault in module <unknown> at 0000:3030302e.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nukemmeister@gmail.com>
    sinNULL.

    ========================================

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