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             AUSCERT External Security Bulletin Redistribution

       Symantec Antivirus products fail to properly handle CAB files
                              7 November 2012


        AusCERT Security Bulletin Summary

Product:           Symantec Antivirus products
Publisher:         US-CERT
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-4953  

Original Bulletin: 

Comment: As Symantec Endpoint Protection 11 uses an older scan engine there are
         currently no plans to update this version. Symantec recommends that 
         users upgrade to Symantec Endpoint Protection 12.

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Vulnerability Note VU#985625
Symantec Antivirus products fail to properly handle CAB files

Original Release date: 05 Nov 2012 | Last revised: 05 Nov 2012


Multiple Symantec Antivirus products fail to properly handle CAB files, which 
may allow a remote, unauthenticated attacker to execute arbitrary code with 
SYSTEM privileges.


The CAB file decomposer component that is used by multiple Symantec Antivirus 
products fails to properly handle malformed CAB files, which can result in 
memory corruption. Successful exploitation may result in arbitrary code 
execution as the result of a file being scanned. We have confirmed that 
Symantec Endpoint Protection 11, which uses dec_abi.dll, and Symantec Scan 
Engine 5.2, which uses Dec2CAB.dll, are affected.


A remote, unauthenticated attacker may be able to execute arbitrary code with 
SYSTEM privileges on a vulnerable system.


Apply an update

Symantec has indicated that Symantec Endpoint Protection 11 uses an older scan 
engine, and that the best course of remediation is to upgrade to Symantec 
Endpoint Protection 12. Symantec currently has no plans to update Symantec 
Endpoint Protection 11. We have verified that Symantec Scan Engine, now known 
as Symantec Protection Engine for Cloud Services, version 7 does not appear to 
be affected.

Use the Microsoft Enhanced Mitigation Experience Toolkit

The Microsoft Enhanced Mitigation Experience Toolkit (EMET) can be used to 
help prevent exploitation of this vulnerability. CERT/CC has created a video 
tutorial for setting up EMET 3.0 on Windows 7. Note that platforms that do not 
support ASLR, such as Windows XP and Windows Server 2003, will not receive the 
same level of protection that modern Windows platforms will.

Enable DEP in Microsoft Windows

Consider enabling Data Execution Prevention (DEP) in supported versions of 
Windows. DEP should not be treated as a complete workaround, but it can 
mitigate the execution of attacker-supplied code in some cases. Microsoft has 
published detailed technical information about DEP in Security Research & 
Defense blog posts "Understanding DEP as a mitigation technology" part 1 and 
part 2. DEP should be used in conjunction with the application of patches or 
other mitigations described in this document.

Note that when relying on DEP for exploit mitigation, it is important to use 
a system that supports Address Space Layout Randomization (ASLR) as well. ASLR 
is not supported by Windows XP or Windows Server 2003 or earlier. ASLR was 
introduced with Microsoft Windows Vista and Windows Server 2008. Please see the 
Microsoft SRD blog entry: On the effectiveness of DEP and ASLR for more 

Vendor Information (Learn More)

Vendor		Status		Date Notified	Date Updated
Symantec	Affected	08 Apr 2011	05 Nov 2012
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)
Group 		Score 	Vector
Base 		10.0 	AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal 	7.8 	E:POC/RL:OF/RC:C
Environmental 	7.8 	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND




This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.
Other Information

    CVE IDs: CVE-2012-4953
    Date Public: 05 Nov 2012
    Date First Published: 05 Nov 2012
    Date Last Updated: 05 Nov 2012
    Document Revision: 15


If you have feedback, comments, or additional information about this
vulnerability, please send us email.

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