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McAfee - Security Bulletin: 5900 Anti-Malware Scan Engine update fixes a Denial of Service issue (CVE-2016-8031)
Security Bulletins ID:   SB10191
Last Modified:  5/19/2017
Rated:


Summary

First Published: 3/24/2017
 
 CVE Numbers:  CVE-2016-8031
 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
Anti-Malware Scan Engine for Linux 5200 liblnxfv.so.4 July 2007
Anti-Malware Scan Engine for Windows 5200 mcscan32.dll
mscan64a.dll
July 2007
Anti-Malware Scan Engine for FreeBSD 5200 libbsdfv.so.4 July 2007
Anti-Malware Scan Engine for AIX 5200 libaixfv.a July 2007
Anti-Malware Scan Engine for Sun Solaris 5200 libsunfv.so.4 July 2007
Anti-Malware Scan Engine for HP-UX 5200 libhpxfv.4 July 2007
Anti-Malware Scan Engine for Linux 5300 liblnxfv.so.4 July 2008
Anti-Malware Scan Engine for Windows 5300 mcscan32.dll
mscan64a.dll
July 2008
Anti-Malware Scan Engine for FreeBSD 5300 libbsdfv.so.4 July 2008
Anti-Malware Scan Engine for AIX 5300 libaixfv.a July 2008
Anti-Malware Scan Engine for Sun Solaris 5300 libsunfv.so.4 July 2008
Anti-Malware Scan Engine for HP-UX 5300 libhpxfv.4 July 2008
Anti-Malware Scan Engine for Linux 5400 liblnxfv.so.4 September 2009
Anti-Malware Scan Engine for Windows 5400 mcscan32.dll
mscan64a.dll
September 2009
Anti-Malware Scan Engine for FreeBSD 5400 libbsdfv.so.4 September 2009
Anti-Malware Scan Engine for AIX 5400 libaixfv.a September 2009
Anti-Malware Scan Engine for Sun Solaris 5400 libsunfv.so.4 September 2009
Anti-Malware Scan Engine for HP-UX 5400 libhpxfv.4 September 2009
Anti-Malware Scan Engine for Linux 5500 liblnxfv.so.4 March 2012
Anti-Malware Scan Engine for Windows 5500 mcscan32.dll
mscan64a.dll
March 2012
Anti-Malware Scan Engine for FreeBSD 5500 libbsdfv.so.4 March 2012
Anti-Malware Scan Engine for AIX 5500 libaixfv.a March 2012
Anti-Malware Scan Engine for Sun Solaris 5500 libsunfv.so.4 March 2012
Anti-Malware Scan Engine for HP-UX 5500 libhpxfv.4 March 2012
Anti-Malware Scan Engine for Linux 5600 liblnxfv.so.4 April 2013
Anti-Malware Scan Engine for Windows 5600 mcscan32.dll
mscan64a.dll
April 2013
Anti-Malware Scan Engine for FreeBSD 5600 libbsdfv.so.4 April 2013
Anti-Malware Scan Engine for AIX 5600 libaixfv.a April 2013
Anti-Malware Scan Engine for Sun Solaris 5600 libsunfv.so.4 April 2013
Anti-Malware Scan Engine for HP-UX 5600 libhpxfv.4 April 2013
Anti-Malware Scan Engine for Linux 5700 liblnxfv.so.4 September 2014
Anti-Malware Scan Engine for Windows 5700 mcscan32.dll
mscan64a.dll
September 2014
Anti-Malware Scan Engine for FreeBSD 5700 libbsdfv.so.4 September 2014
Anti-Malware Scan Engine for AIX 5700 libaixfv.a September 2014
Anti-Malware Scan Engine for Sun Solaris 5700 libsunfv.so.4 September 2014
Anti-Malware Scan Engine for HP-UX 5700 libhpxfv.4 September 2014
Anti-Malware Scan Engine for Linux 5800 liblnxfv.so.4 September 2015
Anti-Malware Scan Engine for Windows 5800 mcscan32.dll
mscan64a.dll
September 2015
Anti-Malware Scan Engine for FreeBSD 5800 libbsdfv.so.4 September 2015
Anti-Malware Scan Engine for Sun Solaris 5800 libsunfv.so.4 September 2015
Anti-Malware Scan Engine for HP-UX 5800 libhpxfv.4 September 2015
Anti-Malware Scan Engine for HP-UX 5800 libhpxfv.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-2016-8031
Software Integrity Attacks vulnerability in McAfee Anti-Virus Engine (AVE) 5200 through 5800 allows local users to bypass local security protection via a crafted input file.
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-8031
 
Affected Components:
  • mcscan32.dll
  • mscan64a.dll
  • liblnxfv.so.4
  • libbsdfv.so.4
  • libaixfv.a
  • libsunfv.so.4
  • libhpxfv.4
All of these issues are resolved in the 5900 Anti-Malware Scan Engine released on March 6, 2017.

Remediation

Upgrade products to use the new 5900 Anti-Malware Scan Engine.
 
Product Type Version File Name Release Date
Anti-Malware Scan Engine for Linux     RTW 5900 liblnxfv.so.4 March 6, 2017
Anti-Malware Scan Engine for Windows RTW 5900 mcscan32.dll
mscan64a.dll
March 6, 2017
Anti-Malware Scan Engine for FreeBSD RTW 5900 libbsdfv.so.4 March 6, 2017
Anti-Malware Scan Engine for AIX RTW 5900 libaixfv.a March 6, 2017
Anti-Malware Scan Engine for Sun Solaris RTW 5900 libsunfv.so.4 March 6, 2017
Anti-Malware Scan Engine for HP-UX RTW 5900 libhpxfv.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 test samples and investigation, it was determined that the vulnerability affects the Anti-Malware Scan Engine (versions 5200 to 5800), on both Windows and non-Windows platforms. The issue affects certain file format parsing modules of the Anti-Malware Scan Engine: Windows 32-bit PE (Portable Executable), PDF, RTF, TAR, and CAB. When the affected code paths are executed, the engine either loops indefinitely or crashes, causing a Denial of Service (DoS). There is no Remote Code Execution (RCE) in either case. No DAT mitigations exist. These issues are fixed in the current 5900 Anti-Malware Scan Engine release.

Workaround

There are no workarounds.

Acknowledgements

McAfee credits Otto Airamo and Antti Levomäki from Forcepoint for reporting this flaw.

Frequently Asked Questions (FAQs)

What are the CVSS scoring metrics that have been used?
 
CVE-2016-8031:
 
 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.
 
Any future product release dates mentioned in this security bulletin are intended to outline our general product direction and they should not be relied on in making a purchasing decision. The product release dates are for information purposes only, and may not be incorporated into any contract. The product release dates are not a commitment, promise, or legal obligation to deliver any material, code, or functionality. The development, release, and timing of any features or functionality described for our products remains at our sole discretion and may be changed or cancelled at any time.

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