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McAfee Security Bulletin: Advanced Threat Defense update for Venom vulnerability
Security Bulletins ID:   SB10118
Last Modified:  4/7/2017


 Impact of Vulnerability:  An attacker can send commands and specially crafted parameter data from the guest system via the virtual floppy driver to execute arbitrary code in the context of the ATD’s hypervisor process.
 CVE Numbers:  CVE-2015-3456
 Severity Rating:  High
 Base / Overall CVSS v2 Scores:  7.7/6.7
 Recommendations:  Update to release
 Security Bulletin Replacement:  None
 Affected Software:  Advanced Threat Defense (ATD) and earlier
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:


VENOM, CVE-2015-3456, is a vulnerability in the floppy drive code used by many computer virtualization platforms. Venom could give significant elevated access to the host’s local network. This fix ensures that the data that the floppy controller accesses has boundary checks and should not overflow floppy Sector length. Also, the floppy controller Meta data boundary check has been provided.
McAfee recommends the following organization for information and updates related to the Venom vulnerability.
This security vulnerability in the ATD virtual floppy drive code can be attacked by buffer overflow. An attacker can send commands and specially crafted parameter data from the guest system to execute arbitrary code in the context of ATD’s hypervisor process.
Improper Restriction of Operations within the Bounds of a Memory Buffer


Update ATD to the latest hotfix release.

Go to the Product Downloads site and download the applicable product hotfix file:
Product Type Patch Version File Name Release Date
ATD 3.4.6 Hotfix system- May 18, 2015

Product Specific Notes
  • Advanced Threat Defense (ATD)
    Affected Versions:
    • and earlier
    Protected Versions:
    • and later
    This hotfix updated the affected qemu binaries.
McAfee Product Download Instructions
  1. Launch Internet Explorer.
  2. Navigate to: http://www.mcafee.com/us/downloads/downloads.aspx.
  3. Provide your valid Grant Number.
  4. Click your product suite.
  5. Click the applicable product (see table above) and click I Agree.
  6. Click the Patches tab and click the link to download the product .ZIP file under the Product column.
For instructions on how to download McAfee products, documentation, security updates, patches, or hotfixes, see: KB56057.

For instructions on how to install/upgrade these hotfixes/patches, please review the Release Notes and the Installation Guide (which you can download from the Documentation tab) following the same steps above.


None. Install the provided hotfix update.

Vulnerability detection signatures for McAfee Vulnerability Manager (MVM) are updated frequently. You can find these Foundstone Scripting Language (FSL) vulnerability checks at:
Download the latest content and enable the checks if they are not enabled by default.


McAfee credits Jason Geffner, Senior Security Researcher from CrowdStrike for reporting this flaw.

Frequently Asked Questions (FAQs)

How do I know whether my McAfee product is vulnerable or not?

For Endpoint products:
Use the following instructions for endpoint or client based products:
  1. Right-click on the McAfee tray shield icon on the Windows task bar.
  2. Select Open Console.
  3. In the console, select Action Menu.
  4. In the Action Menu, select Product Details. The product version is displayed.
For ePO / Server products:
Use the following instructions for server based products:
  • Check the version and build of ePO that is installed. For more information on how to check the version, see: KB52634.
  • Or, create a query in ePO for the product version of the product installed within your organization.
For Appliances:
Use the following instructions for Appliance based products:
  1. Open the Administrator's User Interface (UI).
  2. Click the About link. The product version is displayed.
For DLPe ePO Extension:
Use the following instructions:
  1. Log on to ePO server.
  2. Click Menu, Data Protection, DLP Policy.
  3. Inside the DLP console click the Help menu item, About. The product version is displayed.
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 v2 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.

CVSS v3 scoring is in final review as of March 2015. CVSS v2 will be replaced with CVSS v3 when v3 is fully approved.
What are the CVSS scoring metrics that have been used?
CVE-2015-3456: Venom
 Base Score 7.7
 Related exploit range (AccessVector) Adjacent Network (AV:A)
 Attack complexity (AccessComplexity) Low (L)
 Level of authentication needed (Authentication) Single (Au:S)
 Confidentiality impact Complete (C)
 Integrity impact Complete (C)
 Availability impact Complete (C)
 Temporal Score (Overall) 6.7
 Availability of exploit (Exploitability) High (E:H)
 Type of fix available (RemediationLevel) Official Fix (RL:OF)
 Level of verification that vulnerability exists (ReportConfidence) Confirmed (RC:C)

NOTE: The below CVSS version 2.0 vector was used to generate this score.

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.


To contact Technical Support, log on to the ServicePortal and go to the Create a Service Request page at https://support.mcafee.com/ServicePortal/faces/serviceRequests/createSR:
  • If you are a registered user, type your User Id and Password, and then click Log In.
  • If you are not a registered user, click Register and complete the required fields. Your password and logon instructions will be emailed to you.


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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