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                             CERT-Renater

                  Note d'Information No. 2012/VULN450
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DATE                :  08/11/2012

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S) : Systems running Symantec Antivirus products.

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http://www.kb.cert.org/vuls/id/985625
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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

Overview

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


Description

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.


Impact

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


Solution

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 details.


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


References

    http://www.symantec.com/endpoint-protection
    http://www.symantec.com/protection-engine-for-cloud-services
    http://support.microsoft.com/kb/2458544
    http://www.youtube.com/watch?v=28_LUs_g0u4

http://blogs.technet.com/srd/archive/2009/06/05/understanding-dep-as-a-mitigation-technology-part-1.aspx

http://blogs.technet.com/srd/archive/2009/06/12/understanding-dep-as-a-mitigation-technology-part-2.aspx

http://blogs.technet.com/b/srd/archive/2010/12/08/on-the-effectiveness-of-dep-and-aslr.aspx


Credit

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


Feedback

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


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