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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0555 Endpoint Security for Windows update fixes five vulnerabilities 15 February 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: McAfee Endpoint Security Publisher: McAfee Operating System: Windows Impact/Access: Denial of Service -- Existing Account Access Confidential Data -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-23883 CVE-2021-23882 CVE-2021-23881 CVE-2021-23880 CVE-2021-23878 Original Bulletin: https://kc.mcafee.com/corporate/index?page=content&id=SB10345 - --------------------------BEGIN INCLUDED TEXT-------------------- McAfee Security Bulletin - Endpoint Security for Windows update fixes five vulnerabilities (CVE-2021-23878, CVE-2021-23880, CVE-2021-23881, CVE-2021-23882, CVE-2021-23883) Security Bulletins ID : SB10345 Last Modified : 2/10/2021 Summary First Published: February 9, 2021 Recent updates to this article +-------------------+-------------------------------+ | Date | Update | +-------------------+-------------------------------+ | February 10, 2021 | Fixed a typo in a CVE number. | +-------------------+-------------------------------+ 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. +----------------+----------+--------------+----------------+--------+--------+ | | | | | |CVSS | | |Impacted | |Impact of |Severity|v3.1 | |Product: |Versions: |CVE ID: |Vulnerabilities:|Ratings:|Base/ | | | | | | |Temporal| | | | | | |Scores: | +----------------+----------+--------------+----------------+--------+--------+ | |Prior to | |CWE-312: | | | | |10.7.0 and| |Cleartext | | | |Endpoint |10.6.1 |CVE-2021-23878|storage of |High |7.3 / | |Security (ENS) |February | |sensitive | |6.6 | | |2021 | |information | | | | |Update | | | | | +----------------+----------+--------------+----------------+--------+--------+ | |Prior to | | | | | | |10.7.0 and| |CWE-269: | | | |ENS |10.6.1 |CVE-2021-23880|Improper |Medium |6.7 / | | |February | |Privilege | |6.0 | | |2021 | |Management | | | | |Update | | | | | +----------------+----------+--------------+----------------+--------+--------+ | |Prior to | | | | | | |10.7.0 and| |CWE-79: Stored | | | |ENS |10.6.1 |CVE-2021-23881|Cross Site |Medium |4.8 / | | |February | |Scripting | |4.3 | | |2021 | | | | | | |Update | | | | | +----------------+----------+--------------+----------------+--------+--------+ | |Prior to | | | | | | |10.7.0 and| |CWE-269: | | | |ENS |10.6.1 |CVE-2021-23882|Improper |High |8.2 / | | |February | |Privilege | |7.1 | | |2021 | |Management | | | | |Update | | | | | +----------------+----------+--------------+----------------+--------+--------+ | |Prior to | | | | | | |10.7.0 and| |CWE-476: NULL | | | |ENS |10.6.1 |CVE-2021-23883|Pointer |Medium |4.0 / | | |February | |Dereference | |3.6 | | |2021 | | | | | | |Update | | | | | +----------------+----------+--------------+----------------+--------+--------+ |Recommendations:|Install or update to ENS 10.7.0 and 10.6.1 February 2021 | | |Update | +----------------+------------------------------------------------------------+ |Security | | |Bulletin |None | |Replacement: | | +----------------+------------------------------------------------------------+ |Location of | | |updated |http://www.mcafee.com/us/downloads/downloads.aspx | |software: | | +----------------+------------------------------------------------------------+ Article contents: o Vulnerability Description o Remediation o Mitigations o Acknowledgments o Frequently Asked Questions (FAQs) o Resources o Disclaimer Vulnerability Description 1. CVE-2021-23878 Clear text storage of sensitive Information in memory vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 February 2021 Update allows a local user to view ENS settings and credentials via accessing process memory after the ENS administrator has performed specific actions. To exploit this, the local user has to access the relevant memory location immediately after an ENS administrator has made a configuration change through the console on their machine. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23878 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23878 2. CVE-2021-23880 Improper Access Control in attribute in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 February 2021 Update allows authenticated local administrator user to perform an uninstallation of the anti-malware engine via the running of a specific command with the correct parameters. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23880 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23880 3. CVE-2021-23881 A stored cross site scripting vulnerability in ePO extension of McAfee Endpoint Security (ENS) prior to 10.7.0 February 2021 Update allows an ENS ePO administrator to add a script to a policy event which will trigger the script to be run through a browser block page when a local non-administrator user triggers the policy. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23881 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23881 4. CVE-2021-23882 Improper Access Control vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 February 2021 Update allows local administrators to prevent the installation of some ENS files by placing carefully crafted files where ENS will be installed. This is only applicable to clean installations of ENS as the Access Control rules will prevent modification prior to up an upgrade. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23882 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23882 5. CVE-2021-23883 A Null Pointer Dereference vulnerability in McAfee Endpoint Security (ENS) for Windows prior to 10.7.0 February 2021 Update allows a local administrator to cause Windows to crash via a specific system call which is not handled correctly. This varies by machine and had partial protection prior to this update. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23883 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23883 Remediation To remediate this issue: o Customers on ENS 10.7.0: Update to ENS 10.7.0 February 2021 Update. o Customers on ENS 10.6.1: Upgrade to ENS 10.7.0 February 2021 Update, or update to ENS 10.6.1 February 2021 Update. Go to the Product Downloads site , and download the applicable product update files: +---------------+---------------------------+------+----------------+ |Product |Version |Type |Release Date | +---------------+---------------------------+------+----------------+ |ENS for Windows|10.7.0 February 2021 Update|Update|February 9, 2021| | |10.6.1 February 2021 Update| | | +---------------+---------------------------+------+----------------+ Download and Installation Instructions For instructions to download McAfee product updates and hotfixes, see: KB56057 - - How to download Enterprise product updates and documentation . Review the Release Notes and the Installation Guide for instructions on how to install these updates. All documentation is available at https://docs.mcafee.com . Mitigations McAfee is providing a mitigation solution for CVE-2021-23880. It is as an alternative for those customers that have ENS 10.7.0/10.6.1 November 2020 Updates or earlier, and can't immediately apply the ENS 10.7.0/10.6.1 February 2021 Updates. The mitigation is to create a custom Expert Rule in ePO that prevents unauthorized uninstallation of the ENS antimalware engine. For instructions, see: KB94133 - REGISTERED - Create an Expert Rule that prevents unauthorized uninstall of the Endpoint Security antimalware engine (CVE-2021-23880) . The referenced article is available only to registered ServicePortal users. To view registered articles: 1. Log on to the ServicePortal at http://support.mcafee.com . 2. Type the article ID in the search field on the home page. 3. Click Search or press Enter. Acknowledgments McAfee credits the following for responsibly reporting flaws. CVE-2021-23878 - Lockheed Martin Red Team CVE-2021-23883 - Alain Rodel from cirosec GmbH Frequently Asked Questions (FAQs) How do I know if my McAfee product is vulnerable or not For Endpoint Security on Windows: Use the following instructions for endpoint or client-based products: 1. Right-click the McAfee tray shield icon on the Windows taskbar. 2. Select McAfee Endpoint Security . 3. In the console, select Action Menu . 4. In the Action Menu, select About . 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 1. CVE-2021-23878: Clear text storage of sensitive Information in ENS +------------------------+--------------------+ |Base Score |7.3 | +------------------------+--------------------+ |Attack Vector (AV) |Local (L) | +------------------------+--------------------+ |Attack Complexity (AC) |Low (L) | +------------------------+--------------------+ |Privileges Required (PR)|Low (L) | +------------------------+--------------------+ |User Interaction (UI) |Required (R) | +------------------------+--------------------+ |Scope (S) |Unchanged (U) | +------------------------+--------------------+ |Confidentiality (C) |High (H) | +------------------------+--------------------+ |Integrity (I) |High (H) | +------------------------+--------------------+ |Availability (A) |High (H) | +------------------------+--------------------+ |Temporal Score (Overall)|6.6 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |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:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C&version=3.1 2. CVE-2021-23880: Improper Access Control in the ENS installer +------------------------+--------------------+ |Base Score |6.7 | +------------------------+--------------------+ |Attack Vector (AV) |Local (L) | +------------------------+--------------------+ |Attack Complexity (AC) |Low (L) | +------------------------+--------------------+ |Privileges Required (PR)|High (H) | +------------------------+--------------------+ |User Interaction (UI) |None (N) | +------------------------+--------------------+ |Scope (S) |Unchanged (U) | +------------------------+--------------------+ |Confidentiality (C) |High (H) | +------------------------+--------------------+ |Integrity (I) |High (H) | +------------------------+--------------------+ |Availability (A) |High (H) | +------------------------+--------------------+ |Temporal Score (Overall)|6.0 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |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:H/ UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C&version=3.1 3. CVE-2021-23881: Stored Cross Site Scripting in ENS +------------------------+--------------------+ |Base Score |4.8 | +------------------------+--------------------+ |Attack Vector (AV) |Network (N) | +------------------------+--------------------+ |Attack Complexity (AC) |Low (L) | +------------------------+--------------------+ |Privileges Required (PR)|High (H) | +------------------------+--------------------+ |User Interaction (UI) |Required (R) | +------------------------+--------------------+ |Scope (S) |Changed (C) | +------------------------+--------------------+ |Confidentiality (C) |Low (L) | +------------------------+--------------------+ |Integrity (I) |Low (L) | +------------------------+--------------------+ |Availability (A) |None (N) | +------------------------+--------------------+ |Temporal Score (Overall)|4.3 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |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:N/AC:L/PR:H/ UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C&version=3.1 4. CVE-2021-23882: Improper Access Control in the ENS installer +------------------------+--------------------+ |Base Score |8.2 | +------------------------+--------------------+ |Attack Vector (AV) |Local (L) | +------------------------+--------------------+ |Attack Complexity (AC) |Low (L) | +------------------------+--------------------+ |Privileges Required (PR)|High (H) | +------------------------+--------------------+ |User Interaction (UI) |None (N) | +------------------------+--------------------+ |Scope (S) |Changed (C) | +------------------------+--------------------+ |Confidentiality (C) |High (H) | +------------------------+--------------------+ |Integrity (I) |High (H) | +------------------------+--------------------+ |Availability (A) |High (H) | +------------------------+--------------------+ |Temporal Score (Overall)|7.1 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |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:H/ UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C&version=3.1 5. CVE-2021-23883: +------------------------+--------------------+ |Base Score |4.0 | +------------------------+--------------------+ |Attack Vector (AV) |Local (L) | +------------------------+--------------------+ |Attack Complexity (AC) |High (H) | +------------------------+--------------------+ |Privileges Required (PR)|High (H) | +------------------------+--------------------+ |User Interaction (UI) |Required (R) | +------------------------+--------------------+ |Scope (S) |Unchanged (U) | +------------------------+--------------------+ |Confidentiality (C) |None (N) | +------------------------+--------------------+ |Integrity (I) |None (N) | +------------------------+--------------------+ |Availability (A) |High (H) | +------------------------+--------------------+ |Temporal Score (Overall)|3.6 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |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:H/PR:H/ UI:R/S:U/C:N/I:N/A:H/E:P/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 . To see Security Bulletins for McAfee Enterprise products on this website click Enterprise 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 . To report an issue, click Report a Security Vulnerability . How does McAfee respond to this and any other reported security flaws Our key priority is the security of our customers. If a vulnerability is found within any McAfee software or services, we work closely with the relevant security software development team to ensure the rapid and effective development of a fix and communication plan. McAfee only publishes Security Bulletins if they include something actionable such as a workaround, mitigation, version update, or hotfix. Otherwise, we would simply be informing the hacker community that our products are a target, putting our customers at greater risk. For products that are updated automatically, a non-actionable Security Bulletin might be published to acknowledge the discoverer. View our PSIRT policy on the McAfee PSIRT website at https://www.mcafee.com/us/ threat-center/product-security-bulletins.aspx by clicking About PSIRT . 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. 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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-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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