Date: Tue, 17 May 2011 13:32:56 -0600 From: Vincent Danen <vdanen@...hat.com> To: Wouter Verhelst <w@...r.be> Cc: oss-security@...ts.openwall.com 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 http://bugs.debian.org/627042. 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: >> >> http://nbd.git.sourceforge.net/git/gitweb.cgi?p=nbd/nbd;a=commitdiff;h=ebbbe0b3ce5393fa42a259f5e03d549508586aaa >> >> 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 Makefile.am). The bug >was introduced with this commit: > >http://nbd.git.sourceforge.net/git/gitweb.cgi?p=nbd/nbd;a=commit;h=9ea4e742ce6f1b7793d1edfca70427a8660aeffa > >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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