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McAfee - Security Bulletin: 5900 Anti-Malware Scan Engine update fixes a 64-bit engine crash issue (CVE-2016-8032)
Security Bulletins ID:   SB10190
Last Modified:  5/19/2017

Summary

First Published: 3/24/2017
 
 CVE Numbers:  CVE-2016-8032
 Severity Rating:  High
 Base / Overall CVSS v3 Scores:  7.7 / 7.1
 Recommendations:  Update to the 5900 Anti-Malware Scan Engine
 Security Bulletin Replacement:  None
 Affected Software:  5200 through 5800 Anti-Malware Scan Engine:
Engine Type Engine Version Affected Component Released to World (RTW) Date
64-bit Anti-Malware Scan Engine for Linux 5200 liblnxfv.so.4 July 2007
64-bit Anti-Malware Scan Engine for Windows 5200 mscan64a.dll July 2007
64-bit Anti-Malware Scan Engine for FreeBSD 5200 libbsdfv.so.4 July 2007
64-bit Anti-Malware Scan Engine for Linux 5300 liblnxfv.so.4 July 2008
64-bit Anti-Malware Scan Engine for Windows 5300 mscan64a.dll July 2008
64-bit Anti-Malware Scan Engine for FreeBSD 5300 libbsdfv.so.4 July 2008
64-bit Anti-Malware Scan Engine for Linux 5400 liblnxfv.so.4 September 2009
64-bit Anti-Malware Scan Engine for Windows 5400 mscan64a.dll September 2009
64-bit Anti-Malware Scan Engine for FreeBSD 5400 libbsdfv.so.4 September 2009
64-bit Anti-Malware Scan Engine for Linux 5500 liblnxfv.so.4 March 2012
64-bit Anti-Malware Scan Engine for Windows 5500 mscan64a.dll March 2012
64-bit Anti-Malware Scan Engine for FreeBSD 5500 libbsdfv.so.4 March 2012
64-bit Anti-Malware Scan Engine for Linux 5600 liblnxfv.so.4 April 2013
64-bit Anti-Malware Scan Engine for Windows 5600 mscan64a.dll April 2013
64-bit Anti-Malware Scan Engine for FreeBSD 5600 libbsdfv.so.4 April 2013
64-bit Anti-Malware Scan Engine for Linux 5700 liblnxfv.so.4 September 2014
64-bit Anti-Malware Scan Engine for Windows 5700 mscan64a.dll September 2014
64-bit Anti-Malware Scan Engine for FreeBSD 5700 libbsdfv.so.4 September 2014
64-bit Anti-Malware Scan Engine for Linux 5800 liblnxfv.so.4 September 2015
64-bit Anti-Malware Scan Engine for Windows 5800 mscan64a.dll September 2015
64-bit Anti-Malware Scan Engine for FreeBSD 5800 libbsdfv.so.4 September 2015
 Location of Updated Software:  https://www.mcafee.com/apps/downloads/security-updates/security-updates.aspx?region=us

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Article contents:

Description

CVE-2016-8030
A memory corruption vulnerability in the Scriptscan COM Object in McAfee VirusScan Enterprise 8.8 Patch 8 and earlier allows remote attackers to create a Denial of Service on the active Internet Explorer tab via a crafted HTML link.
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8030
 
Affected Components:
  • mscan64a.dll
  • liblnxfv.so.4
  • libbsdfv.so.4
All of these issues are resolved in the 5900 Anti-Malware Scan Engine released on March 6, 2017.

Remediation

Upgrade point products to use the new 5900 Anti-Malware Scan Engine.
 
Product Type Version File Name Release Date
64-bit Anti-Malware Scan Engine for Linux  RTW 5900 liblnxfv.so.4 March 6, 2017
64-bit Anti-Malware Scan Engine for Windows  RTW 5900 mscan64a.dll March 6, 2017
64-bit Anti-Malware Scan Engine for FreeBSD RTW 5900 libbsdfv.so.4 March 6, 2017

5900 Anti-Malware Scan Engine Download Instructions for ePolicy Orchestrator:
  1. Launch Internet Explorer.
  2. Navigate to: https://www.mcafee.com/apps/downloads/security-updates/security-updates.aspx?region=us.
  3. Select the Engines tab.
  4. Download the epo5900lnx.zip, epo5900mub.zip, or epo5900win.zip as required for Linux, Mac, or Windows.
See KB56057 for instructions on how to download McAfee products, documentation, security updates, patches, and hotfixes.

For instructions on how to install/upgrade to the 5900 Anti-Malware Scan Engine, please review the Anti-Malware Scan Engine 5900 Release Notes (PD26750) and the ePolicy Orchestrator 5.9 Product Guide (PD26914).

Product Specific Notes

After reception of a test sample and investigation, it was determined that the bug affects the 64-bit Anti-Malware Scan Engine (versions 5200 to 5800) on both Windows and non-Windows platforms. The 32-bit version of the Anti-Malware Scan Engine is not affected. The issue affects an emulation engine and an unpacking module of the Anti-Malware Scan Engine for Windows 32-bit PE (Portable Executable) files. The issue requires DAT content to exercise a specific feature of the Anti-Malware Scan Engine to be exposed. When the code path is executed, the root cause of the crash is a 32-bit unsigned offset.

Ahead of the Anti-Malware Scan Engine 5900 release, a DAT mitigation (via automatic DAT update version 8159) was delivered for all engines on May 6, 2016.

Workaround

There are no workarounds.

Acknowledgements

McAfee credits Tavis Ormandy from Google for reporting this flaw.

Frequently Asked Questions (FAQs)

What is CVSS?
CVSS, or Common Vulnerability Scoring System, is the result of the National Infrastructure Advisory Council’s effort to standardize a system of assessing the criticality of a vulnerability. This system offers an unbiased criticality score between 0 and 10 that customers can use to judge how critical a vulnerability is and plan accordingly. For more information, please visit the CVSS website at: http://www.first.org/cvss/.

When calculating CVSS scores, McAfee has adopted a philosophy that fosters consistency and repeatability. Our guiding principle for CVSS scoring is to score the exploit under consideration by itself. We consider only the immediate and direct impact of the exploit under consideration. We do not factor into a score any potential follow-on exploits that might be made possible by successful exploitation of the issue being scored
 
What are the CVSS scoring metrics that have been used?
 
CVE-2016-8032:
 
 Base Score 7.7
 Attack Vector (AV) Local
 Attack Complexity (AC) Low
 Privileges Required (PR) None
 User Interaction (UI) None
 Scope (S) Unchanged
 Confidentiality (C) None
 Integrity (I) High
 Availability (A) High
 Temporal Score (Overall) 7.1
 Exploitability (E) Functional exploit exists
 Remediation Level (RL) Official fix
 Report Confidence (RC) Confirmed

NOTE: The below CVSS version 3.0 vector was used to generate this score.
https://nvd.nist.gov/cvss/v3-calculator?vector=AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H/E:F/RL:O/RC:C


Where can I find a list of all security bulletins or how do I report a product vulnerability?
To find a list of all security bulletins, or if you have information about a security issue or vulnerability with a McAfee product, please visit our product security website at: http://www.mcafee.com/us/threat-center/product-security-bulletins.aspx.

Resources

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Disclaimer

The information provided in this security bulletin is provided as is without warranty of any kind. McAfee disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall McAfee or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits, or special damages, even if McAfee or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
 
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