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ZDI-07-039: Symantec AntiVirus Engine RAR File Parsing DoS Vulnerability
From: zdi-disclosures () 3com com
Date: Thu, 12 Jul 2007 17:56:18 -0700

ZDI-07-039: Symantec AntiVirus Engine RAR File Parsing DoS Vulnerability
July 12, 2007

-- CVE ID:

-- Affected Vendor:

-- Affected Products:
Symantec AntiVirus Engine

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability since November 20, 2006 by Digital Vaccine protection
filter ID 4695,4824. For further product information on the TippingPoint 


-- Vulnerability Details:
This vulnerability allows attackers to create a denial of service
condition on software with vulnerable installations of the Symantec's
AntiVirus engine. Authentication is not required to exploit this

The specific flaw resides in a forged PACK_SIZE field of a RAR file
header. By setting this field to a specific value an infinite loop
denial of service condition will occur when the scanner processes the

-- Vendor Response:
Symantec has issued an update to correct this vulnerability. More
details can be found at:


-- Disclosure Timeline:
2006.11.01 - Vulnerability reported to vendor
2006.11.20 - Digital Vaccine released to TippingPoint customers
2007.07.12 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by an anonymous researcher.

-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, a division of 3Com, The Zero Day Initiative
(ZDI) represents a best-of-breed model for rewarding security
researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:


The ZDI is unique in how the acquired vulnerability information is used.
3Com does not re-sell the vulnerability details or any exploit code.
Instead, upon notifying the affected product vendor, 3Com provides its
customers with zero day protection through its intrusion prevention
technology. Explicit details regarding the specifics of the
vulnerability are not exposed to any parties until an official vendor
patch is publicly available. Furthermore, with the altruistic aim of
helping to secure a broader user base, 3Com provides this vulnerability
information confidentially to security vendors (including competitors)
who have a vulnerability protection or mitigation product.

CONFIDENTIALITY NOTICE: This e-mail message, including any attachments,
is being sent by 3Com for the sole use of the intended recipient(s) and
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Any unauthorized review, use, disclosure and/or distribution by any 
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