07 November 2012
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.1063 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: 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. - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to firstname.lastname@example.org and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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