Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Tue, 01 Jan 2013 00:07:39 -0700
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Mustapha Rabiu <muztapha@...il.com>,
        William Pitcock <nenolod@...eferenced.org>
Subject: Re: Charybdis: Improper assumptions in the server
 handshake code may lead to a remote crash

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 12/31/2012 02:57 PM, Mustapha Rabiu wrote:
> Hi.
> 
> 
> Can we get a CVE for the following
> 
> --
> 
> Access vector: network Access complexity: low Authentication
> requirement: none
> 
> Confidentiality impact: none Integrity impact: none Availability
> impact: complete
> 
> CVSSv2 temporal score: 6.4
> 
> Exploitability: functional exploit exists Remediation level:
> official fix Report confidence: confirmed
> 
> Summary:
> 
> All versions of Charybdis are vulnerable to a remotely-triggered
> crash bug caused by code originating from ircd-ratbox 2.0.
> (Incidentally, this means all versions since ircd-ratbox 2.0 are
> also vulnerable.)
> 
> The bug has to do with server capability negotiation.  A malformed
> request will trigger a crash due to invalid assumptions.
> 
> Mitigation:
> 
> A patch for all affected versions of ircd-ratbox and charybdis is
> available from the charybdis GIT repository: 
> https://github.com/atheme/charybdis/commit/ac0707aa61d9c20e9b09062294701567c9f41595.patch
>
>  To apply the patch, go to your IRCd source tree and run the
> following commands: $ patch -p1 <
> /path/to/downloaded/patchfile.patch $ make $ make install
> 
> Then you may hotfix the IRCd by running /MODRESTART as a server
> admin.
> 
> Details:
> 
> In ratbox-2, the following code was added to m_capab.c: char *t =
> LOCAL_COPY(parv[i]);
> 
> The other logic was then modified to make use of that
> stack-allocated buffer rather than the original.  LOCAL_COPY() is a
> macro which expands to alloca() and strlcpy(), and the bug
> effectively is caused by this expansion calling strlen(NULL).
> 
> 
> --
> 
> 
> Thanks.
> 
> 
> Mustapha Rabiu


Ah sorry just noticed this as well, repeating so it's not missed:

Please use CVE-2012-6084 for this issue.

Same as http://seclists.org/oss-sec/2012/q4/545


- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
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=zCqa
-----END PGP SIGNATURE-----

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.