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Date: Tue, 17 May 2011 13:32:56 -0600
From: Vincent Danen <>
To: Wouter Verhelst <>
Subject: Re: CVE request: nbd-server

* [2011-05-17 20:40:01 +0200] Wouter Verhelst wrote:

>On Tue, May 17, 2011 at 11:07:46AM -0600, Vincent Danen wrote:
>> * [2011-05-17 10:38:20 +0200] Thijs Kinkhorst wrote:
>> >Hi,
>> >
>> >In Debian the following was reported:
>> >nbd-server 2.9.21 has a NULL-pointer dereference in its negotiation
>> >phase, which allows unauthenticated users to DoS the server by causing
>> >the negotiation to fail (e.g., by specifying a non-existing name for an
>> >export).
>> >
>> >Filed as This affects only 2.9.21 so for us
>> >goes that only our unstable distribution is affected.
>> >
>> >We'd like to have a CVE name for this.
>> The Debian bug is really light on details, so here is the git commit
>> that fixes this:
>> But I don't see any evidence that this _only_ affects 2.9.21.  Are we
>> sure that it doesn't affect earlier versions?  The reporter doesn't
>> indicate one way or the other.
>Yes, absolutely; 2.9.21 and 2.9.21a (diff between .21 and .21a is a
>documentation-related file that wasn't added to The bug
>was introduced with this commit:
>To be 100% sure, I just checked out the tree at the 2.9.20 tag and
>recompiled; I couldn't reproduce it.

Fantastic.  Thank you for the check and the additional commit link.

Vincent Danen / Red Hat Security Response Team 

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