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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3200 Security Bulletin - McAfee Agent for Windows update fixes three vulnerabilities (CVE-2021-31836, CVE-2021-31841, CVE-2021-31847) (SB10369) 23 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: McAfee Agent Publisher: McAfee Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Increased Privileges -- Existing Account Access Confidential Data -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-31847 CVE-2021-31841 CVE-2021-31836 Original Bulletin: https://kc.mcafee.com/corporate/index?page=content&id=SB10369 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletins ID : SB10369 Last Modified : 9/21/2021 Summary First Published: September 21, 2021 +----------------+---------+--------------+-----------------+--------+--------+ | | | | | |CVSS | | |Impacted | |Impact of |Severity|v3.1 | |Product: |Versions:|CVE ID: |Vulnerabilities: |Ratings:|Base/ | | | | | | |Temporal| | | | | | |Scores: | +----------------+---------+--------------+-----------------+--------+--------+ | | | |CWE-269: Improper| | | | | | |Privilege | | | |McAfee Agent |Prior to | |Management | |8.2 / | |(MA) for Windows|5.7.4 |CVE-2021-31847|CWE-347: Improper|High |7.4 | | | | |Verification of | | | | | | |Cryptographic | | | | | | |Signature | | | +----------------+---------+--------------+-----------------+--------+--------+ | | | |CWE-347: Improper| | | | | | |Verification of | | | | |Prior to | |Cryptographic | |8.2 / | |MA for Windows |5.7.4 |CVE-2021-31841|Signature |High |7.4 | | | | |CWE-426: | | | | | | |Untrusted Search | | | | | | |Path | | | +----------------+---------+--------------+-----------------+--------+--------+ | |Prior to | |CWE-269: Improper| |5.6 / | |MA for Windows |5.7.4 |CVE-2021-31836|Privilege |Medium |5.1 | | | | |Management | | | +----------------+---------+--------------+-----------------+--------+--------+ |Recommendations:|Install or update to MA 5.7.4 | +----------------+------------------------------------------------------------+ |Security | | |Bulletin |None | |Replacement: | | +----------------+------------------------------------------------------------+ |Location of | | |updated |Product Downloads site | |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 Acknowledgments o Frequently Asked Questions (FAQs) o Resources o Disclaimer Vulnerability Description This Security Bulletin covers security fixes for MA on Windows. In all three issues, the attacker would need to place files on the local machine to exploit them. The issues are listed in descending order of severity. 1. CVE-2021-31847 Improper access control vulnerability in the repair process for McAfee Agent for Windows prior to 5.7.4 could allow a local attacker to perform a DLL preloading attack using unsigned DLLs. This would result in elevation of privileges and the ability to execute arbitrary code as the system user, through not correctly protecting a temporary directory used in the repair process and not checking the DLL signature. NVD CVE-2021-31847 MITRE CVE-2021-31847 2. CVE-2021-31841 A DLL sideloading vulnerability in McAfee Agent for Windows prior to 5.7.4 could allow a local user to perform a DLL sideloading attack with an unsigned DLL with a specific name and in a specific location. This would result in the user gaining elevated permissions and the ability to execute arbitrary code as the system user, through not checking the DLL signature. NVD CVE-2021-31841 MITRE CVE-2021-31841 3. CVE-2021-31836 Improper privilege management vulnerability in maconfig for McAfee Agent for Windows prior to 5.7.4 allows a local user to gain access to sensitive information. The utility was able to be run from any location on the file system and by a low privileged user. NVD CVE-2021-31836 MITRE CVE-2021-31836 Remediation To remediate this issue, customers should update to MA 5.7.4. Go to the Product Downloads site , and download the applicable product update file: +--------------+-------+------+------------------+ |Product |Version|Type |Release Date | +--------------+-------+------+------------------+ |MA for Windows|5.7.4 |Update|September 21, 2021| +--------------+-------+------+------------------+ Download and Installation Instructions For instructions to download 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 our Product Documentation site . Acknowledgments McAfee Enterprise credits the following for responsibly reporting these flaws: CVE-2021-31847 - @Kharosx0 working with Trend Micro Zero Day Initiative CVE-2021-31836 - mr.d0x - https://twitter.com/mrd0x Frequently Asked Questions (FAQs) How do I know if my product is vulnerable or not For ePO/server products: Use the following instructions for server-based products: o Check the version and build of ePO that is installed. For instructions, see: KB52634 - How to determine what hotfix is installed for ePO . o Create a query in ePO for the product version of the product installed within your organization. What is CVSS Common Vulnerability Scoring System (CVSS) 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 . When calculating CVSS scores, McAfee Enterprise 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-2021-31847: Improper privilege management in repair process of MA for Windows +------------------------+--------------------+ |Base Score |8.2 | +------------------------+--------------------+ |Attack Vector (AV) |Local (L) | +------------------------+--------------------+ |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) |High (H) | +------------------------+--------------------+ |Availability (A) |High (H) | +------------------------+--------------------+ |Temporal Score (Overall)|7.4 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |Remediation Level (RL) |Official Fix (O) | +------------------------+--------------------+ |Report Confidence (RC) |Confirmed (C) | +------------------------+--------------------+ NOTE: This CVSS version 3.1 vector was used to generate this score. 2. CVE-2021-31841: DLL side loading vulnerability in MA for Windows +------------------------+--------------------+ |Base Score |8.2 | +------------------------+--------------------+ |Attack Vector (AV) |Local (L) | +------------------------+--------------------+ |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) |High (H) | +------------------------+--------------------+ |Availability (A) |High (H) | +------------------------+--------------------+ |Temporal Score (Overall)|7.4 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |Remediation Level (RL) |Official Fix (O) | +------------------------+--------------------+ |Report Confidence (RC) |Confirmed (C) | +------------------------+--------------------+ NOTE: This CVSS version 3.1 vector was used to generate this score. 3. CVE-2021-31836: Improper Privilege Management in MA for Windows +------------------------+--------------------+ |Base Score |5.6 | +------------------------+--------------------+ |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) |Low (L) | +------------------------+--------------------+ |Availability (A) |None (N) | +------------------------+--------------------+ |Temporal Score (Overall)|5.1 | +------------------------+--------------------+ |Exploitability (E) |Proof-of-Concept (P)| +------------------------+--------------------+ |Remediation Level (RL) |Official Fix (O) | +------------------------+--------------------+ |Report Confidence (RC) |Confirmed (C) | +------------------------+--------------------+ NOTE: This CVSS version 3.1 vector was used to generate this score. Where can I find a list of all Security Bulletins All Security Bulletins are published on our external PSIRT website . 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 Enterprise If you have information about a security issue or vulnerability with a McAfee Enterprise product, go to the PSIRT website , click Report a Security Vulnerability , and follow the instructions. How does McAfee Enterprise 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 Enterprise 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 Enterprise 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 PSIRT website by clicking About PSIRT . Resources To contact Technical Support, go to the Create a Service Request page and log on to the ServicePortal. 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 fields to have your password and instructions emailed to you. Disclaimer The information provided in this Security Bulletin is provided as is without warranty of any kind. McAfee Enterprise disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall McAfee Enterprise or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if McAfee Enterprise 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-------------------- 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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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