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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== 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-------------------- 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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