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McAfee Security Bulletin: McAfee Agent update fixes a vulnerability in its remote log viewing feature (CVE-2017-3896)
Security Bulletins ID:   SB10183
Last Modified:  5/22/2017
Rated:


Summary

First Published: 1/17/2017
 
 Impact of Vulnerability:  Denial of Service (CWE-730, OWASP 2004:A9)
 Input Validation (CWE-20)
 CVE Numbers:  CVE-2017-3896
 Severity Rating:  High
 Base / Overall CVSS v3 Scores:  7.5 / 7.0
 Recommendations:  Apply McAfee Agent 5.0.4 Hotfix 1174804 (5.0.4.449)
 Security Bulletin Replacement:  None
 Affected Software:  McAfee Agent 5.0.x versions prior to 5.0.4.449
 Location of Updated Software:  http://www.mcafee.com/us/downloads/downloads.aspx

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Article contents:

Description

This McAfee Agent release addresses a vulnerability in the remote log viewing functionality, where an input parameter passed through the URL was not completely validated.

CVE-2017-3896
Unvalidated parameter vulnerability in the remote log viewing capability in McAfee Agent 5.0.x versions prior to 5.0.4.449 allows remote attackers to pass unexpected input parameters via a URL that was not completely validated.
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-3896
 
CWE-20
Improper Input Validation
https://cwe.mitre.org/data/definitions/20.html
 
OWASP 2004:A9
Application Denial of Service
https://www.owasp.org/index.php/OWASP_Top_10
https://www.owasp.org/index.php/A9_2004_Application_Denial_of_Service
 
This issue is encountered only if both of the following two conditions are met. Please note that these are not enabled by default:
  • McAfee Agent remote log viewing functionality is enabled.
  • Remote logs access is not restricted to ePolicy Orchestrator administrators only.
If both of the above conditions are satisfied, only then can a malicious user pass unexpected inputs to McAfee Agent via the URL.

Affected Component:
  • McAfee Agent remote log viewer

Remediation

This issue is resolved in McAfee Agent 5.0.4 Hotfix 1174804 (5.0.4.449). The fix will be included in the next McAfee Agent patch as well.

NOTE: This issue has been confirmed to not affect McAfee Agent 4.8.x versions.

Go to the Product Downloads site and download the applicable product patch/hotfix files:
 
Product Type Version File Name Release Date
McAfee Agent 5.0.4 for Windows          Hotfix 5.0.4.449 MA504HF1174804WIN.zip January 17, 2017
McAfee Agent 5.0.4 for Linux Hotfix 5.0.4.449  MA504 HF1174804LNX.zip January 17, 2017
McAfee Agent 5.0.4 for Mac OS Hotfix 5.0.4.449 MA504HF1174804MAC.zip January 17, 2017
McAfee Agent 5.0.4 for Windows Embedded Hotfix 5.0.4.449 MA504HF1174804WIN_Embedded.zip January 17, 2017

Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation, security updates, patches, and hotfixes. Review the Release Notes and the Installation Guide, which you can download from the Documentation tab, for instructions on how to install these updates.

Product Specific Notes

Product Exposures
If you have enabled the McAfee Agent remote log functionality, and the log access is not restricted to the ePolicy Orchestrator console, you need to update to this hotfix.

Workaround

McAfee strongly recommends that you install the available hotfix. If you cannot, consider using the following as a temporary workaround:
  1. Disable the McAfee Agent remote log viewing functionality via policy.
  2. Restrict remote logs access to ePolicy Orchestrator administrators only.

Mitigations

No vulnerability detection signatures are available.

Acknowledgements

McAfee credits Marcel Bilal for reporting this flaw.

Frequently Asked Questions (FAQs)

How do I know whether my McAfee product is vulnerable or not?
For ePO:
Check the version and build of ePO that is installed. For information on how to check the version, see KB52634.

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-2017-3896: Input validation vulnerability in the McAfee Agent remote log viewing feature
 
 Base Score 7.5
 Attack Vector (AV) Network (N)
 Attack Complexity (AC) Low (L)
 Privileges Required (PR) None (N)
 User Interaction (UI) None (N)
 Scope (S) Unchanged (U)
Confidentiality (C) None (N)
Integrity (I) None (N)
Availability (A) High (H)
 Temporal Score (Overall) 7.0
 Exploitability (E) Functional (F)
 Remediation Level (RL) Official Fix (O)
 Report Confidence (RC) Confirmed (C)

NOTE: The below CVSS version 3.0 vector was used to generate this score.

https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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