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AUSCERT External Security Bulletin Redistribution
ESB-2012.1063
Symantec Antivirus products fail to properly handle CAB files
7 November 2012
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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:
http://www.kb.cert.org/vuls/id/985625
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
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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