[TZO-09-2009] NOD32 (Eset) bypass / evasion (Limited details)

[Thierry Zoller <Thierry@xxxxxxxxx>]

______________________________________________________________________

    From the low-hanging-fruit-department - Nod32 bypass/evasion
______________________________________________________________________

Release mode: Coordinated but limited disclosure.
Ref         : TZO-092009 - Nod32 Evasion RAR
WWW         : 
http://blog.zoller.lu/2005/04/nod32-eset-generic-evasion-limited.html
Vendor      : http://www.eset.com/
Security notification reaction rating : Good enough
Notification to patch window : 14 days

Intersting backround statistics:
Time required to coordinate disclosure and write the advisory: 2,5 hours
Time required to find the bug : 25 minutes

Disclosure Policy : 
http://blog.zoller.lu/2008/09/notification-and-disclosure-policy.html

Affected products : 
- ESET Smart Security 4 (before 15/04/2009)
- ESET NOD32 Antivirus 4 (before 15/04/2009)
- ESET Smart Security 4 Business Edition (before 15/04/2009)
- ESET NOD32 Antivirus 4 Business Edition (before 15/04/2009)
- ESET NOD32 Antivirus for Exchange Server (before 15/04/2009)
- ESET Mail Security  (before 15/04/2009)
- ESET NOD32 Antivirus for Lotus Domino Server (before 15/04/2009)
- ESET File Security (before 15/04/2009)
- ESET Novell Netware (before 15/04/2009)
- ESET DELL STORAGE SERVERS (before 15/04/2009)
- ESET NOD32 Antivirus for Linux gateway devices (before 15/04/2009)
- Command line version : NOD32 prior to 3.0.677


I. Background
~~~~~~~~~~~~~
ESET develops software solutions that deliver instant, comprehensive protection 
against evolving computer security threats. ESET NOD32® Antivirus, is the 
flagship
product, consistently achieves the highest accolades in all types of 
comparative testing and is the foundational product that builds 
out the ESET product line to include ESET Smart Security.

http://www.eset.com/products/eset_performance_advantages.php


II. Description
~~~~~~~~~~~~~~~
The parsing engine can be bypassed by a specially crafted and formated
RAR archive. Details are currently witheld due to other vendors that are 
in process of deploying patches.

III. Impact
~~~~~~~~~~~
A general description of the impact and nature of AV Bypasses/evasions
can be read at : 
http://blog.zoller.lu/2009/04/case-for-av-bypassesevasions.html

The bug results in denying the engine the possibility to inspect
code within the RAR archive. There is no inspection of the content
at all.


IV. Disclosure timeline
~~~~~~~~~~~~~~~~~~~~~~~~~

04/04/2009 : Send proof of concept, description the terms under which 
             I cooperate and the planned disclosure date
                         
                         No reply
                         
09/04/2009 : Resend notification with an indication this will be the last
             attempt to responsibly disclose.
                         
09/04/2009 : Eset acknowledges receipt and previous receipt and apologises 
             for not being able to answer due to an internal
                         miscommunication. Patch will be deployed on the 15th 
of April.

09/04/2009 : Ask where changelog/advisory will be posted to

09/04/2009 : Eset responds that credit will be included in changelogs
             http://www.eset.com/support/updates.php?pageno=3
                                                 
17/04/2009 : Release of this advisory