Incidents
Possible Mail server compromise ? Feb 04 2008 06:28PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (3 replies)
Re: Possible Mail server compromise ? Feb 12 2008 11:41PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (3 replies)
Re: Possible Mail server compromise ? Feb 18 2008 07:19PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (2 replies)
Re: Possible Mail server compromise ? Feb 20 2008 02:43AM
Eduardo Tongson (propolice gmail com) (1 replies)
Re: Possible Mail server compromise ? Feb 20 2008 07:33PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (1 replies)
Re: Possible Mail server compromise ? Feb 21 2008 02:38AM
Eduardo Tongson (propolice gmail com)
Re: Possible Mail server compromise ? Feb 19 2008 05:35PM
Bob Toxen (vger verysecurelinux com) (2 replies)
Re: Possible Mail server compromise ? Feb 20 2008 02:14AM
Jon Oberheide (jon oberheide org) (1 replies)
Re: Possible Mail server compromise ? Feb 20 2008 05:11PM
Valdis Kletnieks vt edu (1 replies)
Re: Possible Mail server compromise ? Feb 20 2008 07:25PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (1 replies)
Re: Possible Mail server compromise ? Feb 20 2008 11:07PM
Peter Kosinar (goober ksp sk) (1 replies)
Re: Possible Mail server compromise ? Feb 21 2008 10:49AM
Faas M. Mathiasen (faas m mathiasen googlemail com) (1 replies)
RE: Possible Mail server compromise ? Feb 22 2008 12:38AM
Richard C Lewis (chad mr-lew com) (1 replies)
Re: Possible Mail server compromise ? Feb 26 2008 04:19PM
Faas M. Mathiasen (faas m mathiasen googlemail com)
Re: Possible Mail server compromise ? Feb 19 2008 06:46PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (3 replies)
Re: Possible Mail server compromise ? Feb 20 2008 02:48PM
Eygene Ryabinkin (rea-sec codelabs ru) (2 replies)
Re: Possible Mail server compromise ? Feb 20 2008 10:59PM
Valdis Kletnieks vt edu (1 replies)
Re: Possible Mail server compromise ? Feb 21 2008 10:31AM
Faas M. Mathiasen (faas m mathiasen googlemail com) (1 replies)
Re: Possible Mail server compromise ? Feb 21 2008 05:13PM
Paul Schmehl (pauls utdallas edu)
Re: Possible Mail server compromise ? Feb 20 2008 07:10PM
Faas M. Mathiasen (faas m mathiasen googlemail com)
Re: Possible Mail server compromise ? Feb 20 2008 07:05AM
Bob Toxen (vger VerySecureLinux com) (1 replies)
Re: Possible Mail server compromise ? Feb 20 2008 07:25PM
Faas M. Mathiasen (faas m mathiasen googlemail com)
Re: Possible Mail server compromise ? Feb 20 2008 01:51AM
Valdis Kletnieks vt edu
Re: Possible Mail server compromise ? Feb 13 2008 09:55AM
Michael Loftis (mloftis wgops com)
Re: Possible Mail server compromise ? Feb 13 2008 05:09AM
Jon Oberheide (jon oberheide org)
On Wed, 2008-02-13 at 00:41 +0100, Faas M. Mathiasen wrote:
[snip]
> Is anybody aware if this is common knowledge? Who else has seen such
> an attack ? Are you monitoring your mail servers for such compromises
> regularly? The name of the Anti-Virus scanner will not be told,
> exploit might be available up on request, as soon as we analyzed it
> for content that might reveal specifics
> about us.

Unfortunately, this is not an uncommon occurance as numerous
vulnerabilities have been discovered in AV vendor software [1]. In
fact, SANS listed antivirus software as one of the top 20 security risks
of 2007 [2]. While many of these vulnerabilities are considered only
"locally" exploitable, using the engines within the context of a mail
server exposes them to be triggered remotely by any rogue email as you
have seen.

To address these exploits against mail servers (and against normal end
hosts as well), I'd suggest deploying your scan engines within a
disposable virtualized environment that can be thrown away when a
exploit is detected and restored from a clean snapshot. For example, we
currently employ a milter frontend that sends mail attachments to a
backend service for analysis that has 10 antivirus engines and 2
behavioral engines, each within a Xen VM instance. This obviously
increases the amount of malware we can detect with multiple,
heterogeneous engines, but more importantly, provides strong isolation
from the mail server itself.

Regards,
Jon Oberheide

[1] NVD ulnerabilities by AV vendor between 2005 and 2007
[2] http://www.sans.org/top20/#s5

--
Jon Oberheide <jon (at) oberheide (dot) org [email concealed]>
GnuPG Key: 1024D/F47C17FE
Fingerprint: B716 DA66 8173 6EDD 28F6 F184 5842 1C89 F47C 17FE
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[ reply ]
Re: Possible Mail server compromise ? Feb 04 2008 07:05PM
Jon R. Kibler (Jon Kibler aset com) (1 replies)
Re: Possible Mail server compromise ? Feb 04 2008 09:39PM
Tony Maupin (tony themaupins com) (1 replies)
Re: Possible Mail server compromise ? Feb 04 2008 09:57PM
Faas M. Mathiasen (faas m mathiasen googlemail com) (1 replies)
Re: Possible Mail server compromise ? Feb 05 2008 05:49PM
Valdis Kletnieks vt edu
RE: Possible Mail server compromise ? Feb 04 2008 06:58PM
Worrell, Brian (BWorrell isdh IN gov)


 

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