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McAfee Security Bulletin - Common Catalog update fixes an XML External Entity Reference vulnerability (CVE-2018-6670)
Security Bulletins ID:   SB10236
Last Modified:  10/24/2019


First Published: May 30, 2018
 Impact of Vulnerability: CWE-611: Improper Restriction of XML External Entity Reference ('XXE')
CWE-827: Improper Control of Document Type Definition
 CVE ID: CVE-2018-6670
 Severity Rating: High
 CVSS v3 Base/Temporal Scores: 7.6/7.3
 Recommendations: Install Common Catalog 2.0.3
 Security Bulletin Replacement: None
 Affected Software: Common Catalog versions earlier than 2.0.3
 Location of updated software: ePO Software Manager
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Article contents: Vulnerability Description
The Common Catalog library contains XML processing code, which by default is implementing the full set of features available within the standard JAVA libraries. This fact means that DOCTYPE and ENTITY processing is available, despite the Common Catalog functionality does not require it.

This feature of the XML standard might permit access and exfiltration of files local to the running JVM, to external URLs referenced within ENTITY specifications, using technique readily documented online. This means that a suitably crafted request made by an authorized user of the ePolicy Orchestrator (ePO) system may be able to expose such material.

External Entity Attack vulnerability in the ePO extension in McAfee Common Catalog versions earlier than 2.0.3 allows remote authenticated users to view confidential information via a crafted HTTP request parameter.
Affected Component:
  • Common Catalog versions earlier than 2.0.3
Upgrade to Common Catalog 2.0.3.
The extensions are available in the ePO Software Manager by searching for Core Catalog ePO Extension:
Product Version Type File Name Release Date
Common Catalog 2.0.3 Update onPrem-common-catalog- May 30, 2018
None. McAfee strongly recommends that you install the available update.
None. McAfee strongly recommends that you install the available update.
McAfee credits Łukasz Juszczyk from ING Tech Poland for reporting this flaw.
Frequently Asked Questions (FAQs)
How do I know if 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 taskbar.
  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 information about how to check the version, see: KB52634.
  • Create a query in ePO for the product version of the product installed within your organization.
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, 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 the successful exploitation of the issue being scored.
What are the CVSS scoring metrics?
CVE-2018-6670: XML External Entity Reference vulnerability
Base Score 7.6
Attack Vector (AV) Network (N)
Attack Complexity (AC) Low (L)
Privileges Required (PR) Low (L)
User Interaction (UI) Required (R)
Scope (S) Changed (C)
Confidentiality (C) High (H)
Integrity (I) None (N)
Availability (A) Low (L)
Temporal Score (Overall) 7.3
Exploitability (E) High(H)
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.
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