Coda RPC2 Denial of Serviec

andrewg_at_felinemenace.org
Date: 07/09/03

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    Date: Wed, 9 Jul 2003 04:33:00 -0700
To: bugtraq@securityfocus.com

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    Program: Coda 6.0.1 and probably below
    Impact: Denial of service of all programs using RPC2
    Discovered: Andrew Griffiths

    1) Background

       Coda is an advanced network filesystem that features many things not found
       in other packages.

    2) Description

       Programs using the RPC2 library can be killed remotely by sending malformed
       packets to the services.

    3) Notes

       Nothing special, although it was disturbingly easy to find.

    4) Vendor status/notes/fixes/statements

       coda@cs.cmu.edu was contacted, and Jan Harkes responded:

    From: Jan Harkes <jaharkes@cs.cmu.edu>

    On Sun, Jul 06, 2003 at 02:32:57AM -0700, andrewg@felinemenace.org wrote:
    > While do some testing, I noticed I could reproducably trigger an assert
    > condition in the rpc2 code (I think its there).
    >
    > I managed to take out pretty much my test serverside of the coda setup.

    Yeah, there are assertions sprinkled all over the place. The closer a
    packet resembles a valid rpc2 packet, the more likely it is that some
    assertion will get triggered.

    I've committed a fix for this case (and a couple of others in the same
    area) to CVS.

    Jan

    References:
            Main coda page: http://coda.cs.cmu.edu
            Coda Denial of service code: http://felinemenace.org/exploits.html

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