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[TZO-31-2009] Ikarus multiple generic evasions (CAB,ZIP,RAR)
From: Thierry Zoller <Thierry () Zoller lu>
Date: Sat, 13 Jun 2009 19:37:24 +0200

________________________________________________________________________

                 From the low-hanging-fruit-department
             Ikarus multiple generic evasions (CAB,RAR,ZIP)
________________________________________________________________________

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Release mode: Coordinated but limited disclosure.
Ref         : [TZO-31-2009] - Ikarus multiple evasions through CAB,RAR,ZIP
WWW         : http://blog.zoller.lu/2009/06/subscribe-to-rss-feed-in-case-you-are.html (sorry)
Vendor      : http://www.ikarus.at
Status      : Patched (after engine version 1.1.58)
CVE         : none provided
Credit      : t.b.a
OSVDB vendor entry: Ikarus is not listed as a vendor in OSVDB
Security notification reaction rating : good
Notification to patch window : 77 days
Disclosure Policy : http://blog.zoller.lu/2008/09/notification-and-disclosure-policy.html


Affected products : 
-  IKARUS virus utilities  (scan-time)
-  IKARUS myM () ilWall
-  IKARUS Content Wall
-  IKARUS security.proxy

I. Background
~~~~~~~~~~~~~
Ikarus Software GMBH is an Anti-virus company based in Austria.

II. Description
~~~~~~~~~~~~~~~
The parsing engine can be bypassed by a specially crafted and formated
RAR (Headflags and Packsize),ZIP (Filelenght) and CAB (Filesize) archive.

III. Impact
~~~~~~~~~~~
The bug results in denying the engine the possibility to inspect
code within the CAb,RAR,ZIP archives. There is no inspection of content
at all.

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


IV. Disclosure time-line
~~~~~~~~~~~~~~~~~~~~~~~~~
DD/MM/YYYY
23/03/2009 : Send proof of concept (ZIP), description the terms under which 
             I cooperate and the planned disclosure date.
                         
04/04/2009 : Send proof of concept (RAR)
         
07/04/2009 : Ikarus acknowledges receipt, patching Dev builds has begun

10/04/2009 : Resending ZIP PoC

13/04/2009 : Submitting CAB PoC

17/04/2009 : Ikarus demands to delay disclosure

01/05/2009 : Ikarus states that it has started Q&A for the new builds

03/06/2009 : Ikarus informs me that they started deploying the patches/updates
             Credit will be given on a website to come.
                     
09/06/2009 : Release of this advisory.



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  • [TZO-31-2009] Ikarus multiple generic evasions (CAB,ZIP,RAR) Thierry Zoller (Jun 15)
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