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AUSCERT External Security Bulletin Redistribution
ESB-2020.1444.2
Endpoint products update to protect against arbitrary file
deletion via symbolic links vulnerability (SB10316)
11 May 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Endpoint Security for Windows
Endpoint Security for Mac
Viruscan Enterprise for Linux
Viruscan Enterprise for Windows
Publisher: McAfee
Operating System: Windows
Linux variants
Mac OS
Impact/Access: Delete Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
Original Bulletin:
https://kc.mcafee.com/corporate/index?page=content&id=SB10316
Revision History: May 11 2020: Vendor released update to Security Bulletins ID: SB10316
April 27 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
McAfee Security Bulletin - Endpoint products update to protect against
arbitrary file deletion via symbolic links vulnerability (CVE-2020-7264,
CVE-2020-7265, CVE-2020-7266, CVE-2020-7267)
Security Bulletins ID : SB10316
Last Modified : 5/7/2020
Summary
First Published: April 23, 2020
+-----------------+---------+-------------+----------------+--------+---------+
| | | | | |CVSS v3.1|
|Product: |Impacted |CVE ID: |Impact of |Severity|Base/ |
| |Versions:| |Vulnerabilities:|Ratings:|Temporal |
| | | | | |Scores: |
+-----------------+---------+-------------+----------------+--------+---------+
|Endpoint Security|10.7.0 | |Privilege | | |
|(ENS) for Windows|10.6.x |CVE-2020-7264|Escalation |High |8.8 / 8.2|
| |10.5.x | |(CWE-274) | | |
+-----------------+---------+-------------+----------------+--------+---------+
|Endpoint Security|10.6.x | |Privilege | | |
|for Mac (ENSM) |10.5.x |CVE-2020-7265|Escalation |High |8.8 / 8.2|
| | | |(CWE-274) | | |
+-----------------+---------+-------------+----------------+--------+---------+
|VirusScan |2.0.x | |Privilege | | |
|Enterprise for |1.9.x |CVE-2020-7266|Escalation |High |8.8 / 8.2|
|Linux (VSEL) | | |(CWE-274) | | |
+-----------------+---------+-------------+----------------+--------+---------+
|VirusScan | | |Privilege | | |
|Enterprise (VSE) |8.8 |CVE-2020-7267|Escalation |High |8.8 / 8.2|
|for Windows | | |(CWE-274) | | |
+-----------------+---------+-------------+----------------+--------+---------+
|Recommendations: |See the Remediation and Mitigations sections below |
+-----------------+-----------------------------------------------------------+
|Security Bulletin|None |
|Replacement: | |
+-----------------+-----------------------------------------------------------+
|Location of |https://www.mcafee.com/us/downloads/downloads.aspx |
|updated software:| |
+-----------------+-----------------------------------------------------------+
To receive email notification when this Security Bulletin is updated, click
Subscribe on the right side of the page. You must be logged on to subscribe.
Article contents:
o Vulnerability Description
o Remediation
o Mitigations
o Product Specific Notes
o CVE Details
o Acknowledgments
o Frequently Asked Questions (FAQs)
o Resources
o Disclaimer
Vulnerability Description
An issue related to an attack technique impacting multiple cybersecurity
vendors has been publicly disclosed.
This vulnerability does not provide the ability to remotely exploit a system,
but rather enables malware or a malicious actor to delete files that they
otherwise would not have access to. Exploitation of the vulnerability requires
running code (or a script) on a victim system that maliciously manipulates
symbolic links to redirect a delete action of a privileged process to an
unintended file.
Remediation
To remediate this issue:
o ENS for Windows
ENS 10.7.x - Update to ENS 10.7.0 Security Hotfix 199847.
ENS 10.6.x - Upgrade to ENS 10.7.0 Security Hotfix 199847, or update to
ENS 10.6.1 Security Hotfix 199847.
ENS 10.5.x - Upgrade to ENS 10.7.0 Hotfix Security 199847, upgrade to
ENS 10.6.1 Security Hotfix 199847, or update to ENS 10.5.5 Security
Hotfix 199847.
o ENSM
ENSM 10.6.x - Update to ENSM 10.6.9.
ENSM 10.5.x - Upgrade to ENSM 10.6.9 or update to ENSM 10.5.10.
o VSE for Windows - Update to VSE 8.8 Patch 14 Security Hotfix 116778.
o VSEL
VSEL 2.0.x - Update to VSEL 2.0.3 Security Hotfix 2635000.
VSEL 1.9.x - Upgrade to VSEL 2.0.3 Security Hotfix 2635000, or update
to VSEL 1.9.2 Security Hotfix 2637000.
+-------------+-------------------------------+------+-----------+------------+
|Product |Version |Type |Release |Restart |
| | | |Date |Needed |
+-------------+-------------------------------+------+-----------+------------+
|ENS for |10.7.0 Security Hotfix 199847 |Hotfix|May 7, 2020|Recommended |
|Windows | | | | |
+-------------+-------------------------------+------+-----------+------------+
|ENS for |10.6.1 Security Hotfix 199847 |Hotfix|May 7, 2020|Recommended |
|Windows | | | | |
+-------------+-------------------------------+------+-----------+------------+
|ENS for |10.5.5 Security Hotfix 199847 |Hotfix|May 7, 2020|Recommended |
|Windows | | | | |
+-------------+-------------------------------+------+-----------+------------+
|ENSM |10.6.9 |Update|May 7, 2020|Not required|
+-------------+-------------------------------+------+-----------+------------+
|ENSM |10.5.10 |Update|May 7, 2020|Not required|
+-------------+-------------------------------+------+-----------+------------+
|VSE for |8.8 Patch 14 Security Hotfix |Hotfix|May 7, 2020|Recommended |
|Windows |116778 | | | |
+-------------+-------------------------------+------+-----------+------------+
|VSEL |2.0.3 Security Hotfix 2635000 |Hotfix|May 7, 2020|Not required|
+-------------+-------------------------------+------+-----------+------------+
|VSEL |1.9.2 Security Hotfix 2637000 |Hotfix|May 7, 2020|Not required|
+-------------+-------------------------------+------+-----------+------------+
Download and Installation Instructions
See KB56057 for instructions on how to download McAfee products, documentation,
updates, 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.
Mitigations
McAfee strongly recommends that you install the relevant fixes listed in the
Remediation section above. Additional mitigations include:
ENS for Windows
Signatures were included in DAT 4053, which was released on April 24, 2020.
This provides prevention of the vulnerability. The signature has been
engineered to detect additional scenarios; these will be reported as
Exploit-Symlink.* . This update complements the Expert Rule outlined in KB92752
. McAfee recommends users apply both.
ENSM, VSE for Windows, VSEL, Total Protection for Mac, and LiveSafe for Mac
Detection signatures were included in DAT 9601, which was released on April 24,
2020. This update provides detection and alert capabilities for this
vulnerability. Detection of this activity will appear as Exploit-Symlink.* .
Product Specific Notes
MOVE Agentless Linux Clients
MOVE Agentless Linux Clients are not vulnerable to this attack technique.
Customers who believe they are being targeted by this attack technique should
contact VMWare for a fix.
CVE Details
1. CVE-2020-7264 - Privilege Escalation vulnerability through symbolic links
in ENS for Windows
Privilege Escalation vulnerability in McAfee Endpoint Security (ENS) for
Windows prior to 10.7.0 Hotfix 199847 allows local users to delete files
the user would otherwise not have access to via manipulating symbolic links
to redirect a McAfee delete action to an unintended file. This is achieved
through running a malicious script or program on the target machine.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2020-7264
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2020-7264
2. CVE-2020-7265 - Privilege Escalation vulnerability through symbolic links
in ENSM
Privilege Escalation vulnerability in McAfee Endpoint Security (ENS) for
Mac prior to 10.6.9 allows local users to delete files the user would
otherwise not have access to via manipulating symbolic links to redirect a
McAfee delete action to an unintended file. This is achieved through
running a malicious script or program on the target machine.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2020-7265
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2020-7265
3. CVE-2020-7266 - Privilege Escalation vulnerability through symbolic links
in VSE for Windows
Privilege Escalation vulnerability in McAfee VirusScan Enterprise (VSE) for
Windows prior to 8.8 Patch 14 Hotfix 116778 allows local users to delete
files the user would otherwise not have access to via manipulating symbolic
links to redirect a McAfee delete action to an unintended file. This is
achieved through running a malicious script or program on the target
machine.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2020-7266
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2020-7266
4. CVE-2020-7267 - Privilege Escalation vulnerability through symbolic links
in VSEL
Privilege Escalation vulnerability in McAfee VirusScan Enterprise (VSE) for
Linux prior to 2.0.3 Hotfix 2635000 allows local users to delete files the
user would otherwise not have access to via manipulating symbolic links to
redirect a McAfee delete action to an unintended file. This is achieved
through running a malicious script or program on the target machine.
https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2020-7267
https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2020-7267
Acknowledgments
Rack911 Labs discovered this vulnerability.
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 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 displays.
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 displays.
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: https://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
The CVSS score is the same for all products in this Security Bulletin.
+------------------------+----------------+
|Base Score |8.8 |
+------------------------+----------------+
|Attack Vector (AV) |Local (L) |
+------------------------+----------------+
|Attack Complexity (AC) |Low (L) |
+------------------------+----------------+
|Privileges Required (PR)|Low (L) |
+------------------------+----------------+
|User Interaction (UI) |None (N) |
+------------------------+----------------+
|Scope (S) |Changed (C) |
+------------------------+----------------+
|Confidentiality (C) |High (H) |
+------------------------+----------------+
|Integrity (I) |High (H) |
+------------------------+----------------+
|Availability (A) |High (H) |
+------------------------+----------------+
|Temporal Score (Overall)|8.2 |
+------------------------+----------------+
|Exploitability (E) |Functional (F) |
+------------------------+----------------+
|Remediation Level (RL) |Official Fix (O)|
+------------------------+----------------+
|Report Confidence (RC) |Confirmed (C) |
+------------------------+----------------+
NOTE: The below CVSS version 3.1 vector was used to generate this score.
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculatorvector=AV:L/AC:L/PR:L/UI:N
/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C&version=3.1
Where can I find a list of all Security Bulletins
All Security Bulletins are published on our external PSIRT website at https://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx > Security
Bulletins. Security Bulletins are retired (removed) once a product is both End
of Sale and End of Support (End of Life).
How do I report a product vulnerability to McAfee
If you have information about a security issue or vulnerability with a McAfee
product, visit the McAfee PSIRT website for instructions at https://
www.mcafee.com/us/threat-center/product-security-bulletins.aspx > Report a
Security Vulnerability.
Resources
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 :
o If you are a registered user, type your User ID and Password, and then
click Log In .
o If you are not a registered user, click Register and complete the required
fields. Your password and logon instructions will be emailed to you.
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 preceding 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 canceled at any time
- --------------------------END INCLUDED TEXT--------------------
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