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Date: Mon, 02 Aug 2010 10:29:46 -1000
From: akuster <>
CC: Eugene Teo <>, 
 "Steven M. Christey" <>
Subject: Re: CVE-2010-2524 kernel: dns_resolver upcall security


So would it mean git commit 6103335de8afa5d780dcd512abe85c696af7b040
introduced the problem?

- Armin

On 08/01/2010 05:47 PM, Eugene Teo wrote:
> CIFS has the ability to chase MS-DFS referrals. In order to do this it
> has to be able to resolve hostnames into IP addresses. For this, it uses
> the keys API to upcall to the cifs.upcall userspace helper. It then
> resolves the name and hands the address back to the kernel.
> The dns_resolver upcall currently used by CIFS is susceptible to cache
> stuffing. It's possible for a malicious user to stuff the keyring with
> the results of a lookup, and then trick the server into mounting a
> server of his choosing.
> I have assigned this with CVE-2010-2524. To be susceptible to this, you
> need CONFIG_CIFS_DFS_UPCALL enabled. Interesting bug.
> Upstream commit:
> Thanks, Eugene

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