bugtraq - RE: Multiple Antivirus Scanners DoS attack.

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Date: Tue, 15 Jun 2004 10:10:36 +0200
From: "Bo Rasmussen" <brr@...esign.dk>
To: <bugtraq@...urityfocus.com>
Subject: RE:  Multiple Antivirus Scanners DoS attack.


Hi,

Just tried with clamscan and clamdscan v.0.71 on a OpenBSD 3.5, with
these signatures:

ClamAV update process started at Tue Jun 15 09:13:49 2004
main.cvd is up to date (version: 23, sigs: 21096, f-level: 2, builder:
ddm)
daily.cvd updated (version: 357, sigs: 866, f-level: 2, builder:
ccordes)
Database updated (21962 signatures) from database.clamav.net
(152.66.249.132).


mail# clamscan SERVER_dwn.zip 
SERVER_dwn.zip: Eicar-Test-Signature FOUND

----------- SCAN SUMMARY -----------
Known viruses: 21962
Scanned directories: 0
Scanned files: 1
Infected files: 1
Data scanned: 20.13 MB
I/O buffer size: 131072 bytes
Time: 9.006 sec (0 m 9 s)
mail#

mail# clamdscan SERVER_dwn.zip 
/var/amavis/SERVER_dwn.zip: Eicar-Test-Signature FOUND

----------- SCAN SUMMARY -----------
Infected files: 1
Time: 8.053 sec (0 m 8 s)
mail#


No problems whatsoever.


Regards

Bo Rising Rasmussen
it/security consultant
brr@...esign.dk

> -----Original Message-----
> From: bipin gautam [mailto:visitbipin@...mail.com] 
> Sent: Monday, June 14, 2004 4:39 PM
> To: cert@...t.org; bugtraq@...urityfocus.com
> Cc: wk@....org; vulndiscuss@...nwatch.org; 
> vulndiscuss-owner@...nwatch.org
> Subject: Multiple Antivirus Scanners DoS attack.
> 
> Multiple Antivirus Scanners DoS attack.
> 
> --- [Vulnerable Products] ---
>       Only tested on...
> 
> * Norton Antivirus 2002
> * Norton Antivirus 2003
> * Mcafee VirusScan 6
> * Network Associates (McAfee) VirusScan Enterprise 7.1
> * Windows Xp default ZIP manager [report's wrong size of 
> compress ZIP files.]
> 
> There has been multiple reports [Unconfirmed] *F-Prot 4.4.2 
> for Linux *Panda Antivirus
> 
> Are vulnerable.
> 
> 
> Risk Impact: Medium
> 
> --- [Details] ---
> 
> While having a manual scan of compressed files; several 
> Antivirus, Trojan, Spy ware scanners suffer a DoS attack if 
> the software tries to completely extract the archive and scan 
> its content for a hostile file.
> 
> --- [Proof of Concept] ---
> Please download this file.
> http://www.geocities.com/visitbipin/SERVER_dwn.zip
> 
> Moreover it's not safe to set automatically 
> 'Quarantine/delete' option set for your AV scanner as it may 
> try to Quarantine the virus by extracting the archive.
> 
> -----------
> Bipin Gautam
> http://www.geocities.com/visitbipin/
> 
> Disclaimer: The information in the advisory is believed to be 
> accurate at the time of printing based on currently available 
> information. Use of the information constitutes acceptance 
> for use in an AS IS condition. There are no warranties with 
> regard to this information. Neither the author nor the 
> publisher accepts any liability for any direct, indirect or 
> consequential loss or damage arising from use of, or reliance 
> on this information.
> 
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