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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0435.6 BIG-IP Edge Client for Windows vulnerability CVE-2020-5855 15 March 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP Edge Client for Windows Publisher: F5 Networks Operating System: Windows Impact/Access: Denial of Service -- Console/Physical Access Confidential Data -- Console/Physical Resolution: Patch/Upgrade CVE Names: CVE-2020-5855 Original Bulletin: https://support.f5.com/csp/article/K55102004 Revision History: March 15 2021: Issue with vendor update and fixes introduced November 19 2020: Vendor added fixes introduced September 18 2020: Vendor updated advisory September 4 2020: Vendor updated product matrix March 4 2020: Additional versions known vulnerable February 6 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K55102004: BIG-IP Edge Client for Windows vulnerability CVE-2020-5855 Original Publication Date: 06 Feb, 2020 Latest Publication Date: 12 Mar, 2021 Security Advisory Description When the Windows Logon Integration feature is configured for BIG-IP Edge Client, unauthorized users who have physical access to an authorized user's machine can get shell access under unprivileged user. (CVE-2020-5855) Impact Attackers may be able to bypass authentication to gain unauthorized access to internal resources or compromise the availability of the resources. Security Advisory Status F5 Product Development has assigned ID 842717 (BIG-IP) to this vulnerability. To determine if your product and version have been evaluated for this vulnerability, refer to the Applies to (see versions) box. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases, point releases, or hotfixes that address the vulnerability, refer to the following table. For more information about security advisory versioning, refer to K51812227: Understanding Security Advisory versioning. +-------------------+------+----------+----------+----------+------+----------+ | | |Versions |Fixes | |CVSSv3|Vulnerable| |Product |Branch|known to |introduced|Severity |score^|component | | | |be |in | |1 |or feature| | | |vulnerable| | | | | +-------------------+------+----------+----------+----------+------+----------+ | |16.x |16.0.0 - |16.0.1.1 | | | | | | |16.0.1^2 | | | | | | +------+----------+----------+ | | | | |15.x |15.0.0 - |15.1.2 | | | | | | |15.1.1^2 | | | | | | +------+----------+----------+ | | | | |14.x |14.1.0 - |14.1.3.1 | | | | | | |14.1.2^2 | | | |Edge | |BIG-IP (APM) +------+----------+----------+Medium |4.3 |Client for| | |13.x |13.1.0 - |13.1.3.5 | | |Windows | | | |13.1.3^2 | | | | | | +------+----------+----------+ | | | | |12.x |12.1.0 - |12.1.5.3* | | | | | | |12.1.5 | | | | | | +------+----------+----------+ | | | | |11.x |11.5.2 - |None | | | | | | |11.6.5^3 | | | | | +-------------------+------+----------+----------+----------+------+----------+ | | | |7.2.1 | | |Edge | |BIG-IP (APM |7.x |7.1.9 |7.1.9.7 |Medium |4.3 |Client for| |Clients) | |7.1.5 - |7.1.8.4 | | |Windows | | | |7.1.8 | | | | | +-------------------+------+----------+----------+----------+------+----------+ | |15.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |14.x |None |Not | | | | |BIG-IP (LTM, AAM, | | |applicable| | | | |AFM, Analytics, +------+----------+----------+ | | | |ASM, DNS, FPS, GTM,|13.x |None |Not |Not |None |None | |Link Controller, | | |applicable|vulnerable| | | |PEM) +------+----------+----------+ | | | | |12.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ |Enterprise Manager |3.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ | |7.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | |BIG-IQ Centralized |6.x |None |Not |Not |None |None | |Management | | |applicable|vulnerable| | | | +------+----------+----------+ | | | | |5.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ |Traffix SDC |5.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ ^*An issue with the bigd process has been discovered in version 12.1.5.3. For more information, refer to K50524736: Bigd process memory leak after updating to BIG-IP 12.1.5.3. ^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. ^2In BIG-IP APM 13.1.0 and later, you can update the APM Clients components independently from BIG-IP software. For more information, refer to K52547540: Updating the BIG-IP Edge Client for the BIG-IP APM system. To address this vulnerability in BIG-IP 13.1.0 and later, download and install an APM Clients version listed in the Fixes introduced in column and redeploy to end users. ^3F5 will not develop a fix for vulnerable products that do not already have a fixed version listed in this article, and will not update this table with subsequent vulnerable releases in the associated branches. F5 recommends that you update to more recent, non-vulnerable versions whenever feasible. For more information, refer to K4602: Overview of the F5 security vulnerability response policy. Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in the Fixes introduced in column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists. Mitigation To mitigate this vulnerability, you can configure the following Windows registry entries on the client machine connecting to the BIG-IP APM system to disallow several Internet Explorer keyboard short cuts. To do so, perform the following procedure: For more information about configuring registry entries, refer to the Using the Registry documentation on the Microsoft Docs website. Note: This link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Impact of action: Performing the following procedure should not have a negative impact on your client system. 1. Log in to the Windows client machine. 2. To open the Registry Editor, select and hold (or right-click) Start and select Run. 3. For Open, enter regedit, then select OK. 4. Edit the registry entries as follows: Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\ Restrictions] "NoFileOpen"=dword:00000001 "NoFileNew"=dword:00000001 "NoOpeninNewWnd"=dword:00000001 5. Save the entries and exit the Registry Editor. Acknowledgements F5 would like to acknowledge Michael Molho of e-Xpert Solutions SA for bringing this issue to our attention and for following the highest standards of coordinated disclosure. Supplemental Information o K40131499: Configuring Dialup Entry/Windows Logon Integration o K41942608: Overview of Security Advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 16.x) o K167: Downloading software and firmware from F5 o K9970: Subscribing to email notifications regarding F5 products o K9957: Creating a custom RSS feed to view new and updated documents - --------------------------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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