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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1073 ePolicy Orchestrator update addresses three vulnerabilities (CVE-2021-23888, CVE-2021-23889, CVE-2021-23890) 29 March 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: McAfee ePolicy Orchestrator Publisher: McAfee Operating System: Windows Impact/Access: Cross-site Scripting -- Remote with User Interaction Provide Misleading Information -- Remote with User Interaction Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-23890 CVE-2021-23889 CVE-2021-23888 Original Bulletin: https://kc.mcafee.com/corporate/index?page=content&id=SB10352 - --------------------------BEGIN INCLUDED TEXT-------------------- McAfee Security Bulletin - ePolicy Orchestrator update addresses three vulnerabilities (CVE-2021-23888, CVE-2021-23889, CVE-2021-23890) Security Bulletins ID : SB10352 Last Modified : 3/25/2021 Summary First Published: March 25, 2021 +----------------+----------+--------------+----------------+--------+--------+ | | | | | |CVSS | | |Impacted | |Impact of |Severity|v3.1 | |Product: |Versions: |CVE ID: |Vulnerabilities:|Ratings:|Base/ | | | | | | |Temporal| | | | | | |Scores: | +----------------+----------+--------------+----------------+--------+--------+ | | | |CWE-938: | | | | | |CVE-2021-23888|Unvalidated |Medium |6.3 / | | |5.10 prior| |Redirects and | |5.7 | | |to Update | |Forwards | | | |ePolicy |10 +--------------+----------------+--------+--------+ |Orchestrator |5.9.1 | |CWE 79: | |3.5 / | |(ePO) |prior to |CVE-2021-23889|Cross-Site |Low |3.2 | | |HF | |Scripting (XSS) | | | | |EPO-937000+--------------+----------------+--------+--------+ | | | |CWE-717: | |6.5 / | | | |CVE-2021-23890|Information Leak|Medium |5.9 | | | | |/Disclosure | | | +----------------+----------+--------------+----------------+--------+--------+ | |Install or update to the versions listed below: | |Recommendations:| | | | o ePO 5.10.0 Update 10 | | | o ePO 5.9.1 HF EPO-937000 | +----------------+------------------------------------------------------------+ |Security | | |Bulletin |None | |Replacement: | | +----------------+------------------------------------------------------------+ |Location of | | |updated |http://www.mcafee.com/us/downloads/downloads.aspx | |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 Additional steps required to address CVE-2021-23890 o Acknowledgments o Frequently Asked Questions (FAQs) o Resources o Disclaimer Vulnerability Description 1. CVE-2021-23888 Unvalidated client-side URL redirect vulnerability in McAfee ePolicy Orchestrator (ePO) prior to 5.10 Update 10 could cause an authenticated ePO user to load an untrusted site in an ePO iframe which could steal information from the authenticated user. This would require the attacker to convince the ePO user to click a malicious link whilst logged into the ePO server through the same browser they clicked on the malicious link in. The results of this attack are not stored in ePO. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23888 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23888 2. CVE-2021-23889 Cross-Site Scripting vulnerability in McAfee ePolicy Orchestrator (ePO) prior to 5.10 Update 10 allows ePO administrators to inject arbitrary web script or HTML via multiple parameters where the administrator's entries were not correctly sanitized. To exploit this the attacker would either: Need to know an existing registered command in the ePO system which they can pass parameters to, triggering the Cross-site scripting vulnerability Add a new registered command to the ePO system which does not sanitize parameters. Adding a new command to the ePO system requires administrator privileges and they must be logged onto the local ePO system, not through the User Interface. This could then be exploited by a another ePO user. Execution of these commands is not granted by default to non-administrator ePO users. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23889 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23889 3. CVE-2021-23890 Information leak vulnerability in the Agent Handler of McAfee ePolicy Orchestrator (ePO) prior to 5.10 Update 10 allows an unauthenticated user to download McAfee product packages (specifically McAfee Agent) available in ePO repository and install them on their own machines to have it managed and then in turn get policy details from the ePO server. This can only happen when the ePO Agent Handler is installed in a Demilitarized Zone (DMZ) to service machines not connected to the network through a VPN. Once the software fix has been applied, further configuration changes are required. See the Additional steps required to address CVE-2021-23890 section below. https://web.nvd.nist.gov/view/vuln/detailvulnId=CVE-2021-23890 https://cve.mitre.org/cgi-bin/cvename.cginame=CVE-2021-23890 Remediation To remediate this issue: o Customers using ePO 5.10 should update to ePO 5.10.0 Update 10. o Customers using ePO 5.9.x and earlier should upgrade to ePO 5.10.0 Update 10. o Customers using ePO 5.9.x and earlier could apply ePO 5.9.1 HF EPO-937000 to resolve only CVE-2021-23890. McAfee strongly recommends upgrading ePO to version 5.10 as the End of Life for ePO 5.9.1 has been announced as August 31, 2021. For more information, see: KB93286 - End of Life for ePolicy Orchestrator 5.9.x . Go to the Product Downloads site , and download the applicable product update/ hotfix file: +-------+-------+------+--------------------+--------------+ |Product|Version|Type |File Name |Release Date | +-------+-------+------+--------------------+--------------+ |ePO |5.9.1 |Hotfix|EPO-937000 |March 25, 2021| +-------+-------+------+--------------------+--------------+ |ePO |5.10.0 |Update|ePO 5.10.0 Update 10|March 25, 2021| +-------+-------+------+--------------------+--------------+ 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 . Additional steps required to address CVE-2021-23890 Apply these two settings changes after applying ePO 5.10.0 Update 10 or ePO 5.9.1 HF EPO-937000: Setting 1: Stop auto-install of the agent into the ePO System Tree coming through the DMZ. 1. On the remote ePO Agent Handler that is installed in a DMZ, navigate to the Agent Handler\DB folder. 2. Edit the server.ini configuration file. 3. Add the setting DMZ=1 under the [Server] section and save the file. Setting 2: Block download of McAfee Agent packages from DMZ installed ePO Agent Handlers. NOTE: The following instructions also prevent off-network/off-VPN McAfee Agents from upgrading their McAfee Agent client software. 1. On the remote ePO Agent Handler that is installed in a DMZ, navigate to the apache2\conf folder. 2. Open the httpd.conf file. 3. Search for this line: <Location /redir/mepo> require all denied </location> 4. Add the following contents to below the location found in the previous step 3. # Block agent package requests from being served by this agent handler <LocationMatch "/Software/(i)(Current|Previous|Evaluation)/EPOAGENT(.*)"> SetHandler none Require all denied </LocationMatch> 5. Save the httpd.conf file. 6. Open Service Control Manager and restart the ePO 5.10 Server service. Acknowledgments McAfee credits the following for responsibly reporting these flaws: CVE-2021-23888 - Ricardo Almeida (vibrio) CVE-2021-23889 - Michal Skowron from ING Tech Poland CVE-2021-23890 - Saulius Pranckevicius from Danske Bank Red Team Frequently Asked Questions (FAQs) How do I know if my McAfee 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 update is installed for ePO . o 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: 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-2021-23888: ePO unvalidated URL redirect vulnerability +------------------------+--------------------+ |Base Score |6.3 | +------------------------+--------------------+ |Attack Vector (AV) |Network (N) | +------------------------+--------------------+ |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)|5.7 | +------------------------+--------------------+ |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:L/ UI:R/S:U/C:H/I:L/A:N/E:P/RL:O/RC:C&version=3.1 2. CVE-2021-23889: ePO Cross-site Scripting vulnerability +------------------------+--------------------+ |Base Score |3.5 | +------------------------+--------------------+ |Attack Vector (AV) |Network (N) | +------------------------+--------------------+ |Attack Complexity (AC) |Low (L) | +------------------------+--------------------+ |Privileges Required (PR)|High (H) | +------------------------+--------------------+ |User Interaction (UI) |Required (R) | +------------------------+--------------------+ |Scope (S) |Unchanged (U) | +------------------------+--------------------+ |Confidentiality (C) |Low (L) | +------------------------+--------------------+ |Integrity (I) |Low (L) | +------------------------+--------------------+ |Availability (A) |None (N) | +------------------------+--------------------+ |Temporal Score (Overall)|3.2 | +------------------------+--------------------+ |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:U/C:L/I:L/A:N/E:P/RL:O/RC:C&version=3.1 3. CVE-2021-23890: ePO Information Leak vulnerability +------------------------+--------------------+ |Base Score |6.5 | +------------------------+--------------------+ |Attack Vector (AV) |Network (N) | +------------------------+--------------------+ |Attack Complexity (AC) |Low (L) | +------------------------+--------------------+ |Privileges Required (PR)|None (N) | +------------------------+--------------------+ |User Interaction (UI) |None (N) | +------------------------+--------------------+ |Scope (S) |Unchanged (U) | +------------------------+--------------------+ |Confidentiality (C) |Low (L) | +------------------------+--------------------+ |Integrity (I) |Low (L) | +------------------------+--------------------+ |Availability (A) |None (N) | +------------------------+--------------------+ |Temporal Score (Overall)|5.9 | +------------------------+--------------------+ |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:N/ UI:N/S:U/C:L/I:L/A:N/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. 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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