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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.2447 K18484125: Eclipse Jetty vulnerability CVE-2020-27216 19 May 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP (all modules) BIG-IQ Centralized Management Traffix SDC Publisher: F5 Networks Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2020-27216 Original Bulletin: https://support.f5.com/csp/article/K18484125 Comment: CVSS (Max): 7.2 CVE-2020-27216 (CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:H) CVSS Source: F5 Networks Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- K18484125: Eclipse Jetty vulnerability CVE-2020-27216 Original Publication Date: 19 May, 2022 Security Advisory Description In Eclipse Jetty versions 1.0 thru 9.4.32.v20200930, 10.0.0.alpha1 thru 10.0.0.beta2, and 11.0.0.alpha1 thru 11.0.0.beta2O, on Unix like systems, the system's temporary directory is shared between all users on that system. A collocated user can observe the process of creating a temporary sub directory in the shared temporary directory and race to complete the creation of the temporary subdirectory. If the attacker wins the race then they will have read and write permission to the subdirectory used to unpack web applications, including their WEB-INF/lib jar files and JSP files. If any code is ever executed out of this temporary directory, this can lead to a local privilege escalation vulnerability. (CVE-2020-27216) Impact A successful exploit could allow an authenticated user to cause a local privilege escalation vulnerability. Security Advisory Status F5 Product Development has assigned ID 1070753 (BIG-IP and BIG-IQ) and ID SDC-1576 and SDC-1578 (Traffix SDC) 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. Note: After a fix is introduced for a given minor branch, that fix applies to all subsequent maintenance and point releases for that branch, and no additional fixes for that branch will be listed in the table. For example, when a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to K51812227: Understanding security advisory versioning. Additionally, software versions preceding those listed in the Applies to (see versions) box of this article have reached the End of Technical Support (EoTS) phase of their lifecycle and are no longer evaluated for security issues. For more information, refer to the Security hotfixes section of K4602: Overview of the F5 security vulnerability response policy. +------------+------+--------------+----------+----------+------+-------------+ | | |Versions known|Fixes | |CVSSv3|Vulnerable | |Product |Branch|to be |introduced|Severity |score^|component or | | | |vulnerable^1 |in | |2 |feature | +------------+------+--------------+----------+----------+------+-------------+ | |17.x |17.0.0 |None | | | | | +------+--------------+----------+ | | | | |16.x |16.0.0 - |None | | | | | | |16.1.2 | | | | | | +------+--------------+----------+ | | | |BIG-IP (all |15.x |15.1.0 - |None | | | | |modules) | |15.1.5 | |High |7.2 |iControl REST| | +------+--------------+----------+ | | | | |14.x |14.1.0 - |None | | | | | | |14.1.4 | | | | | | +------+--------------+----------+ | | | | |13.x |None |Not | | | | | | | |applicable| | | | +------------+------+--------------+----------+----------+------+-------------+ |BIG-IQ |8.x |8.0.0 - 8.2.0 |None | | | | |Centralized +------+--------------+----------+High |7.2 |Restjavad | |Management |7.x |7.0.0 - 7.1.0 |None | | | | +------------+------+--------------+----------+----------+------+-------------+ |F5OS-A |1.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------+------+--------------+----------+----------+------+-------------+ |F5OS-C |1.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------+------+--------------+----------+----------+------+-------------+ | | |5.2.0 | | | |NMS, FEP, | |Traffix SDC |5.x |5.1.0 |None |High |7.0 |CPF, CM, and | | | | | | | |webUI. | +------------+------+--------------+----------+----------+------+-------------+ ^1F5 evaluates only software versions that have not yet reached the End of Technical Support (EoTS) phase of their lifecycle. ^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by installing a version listed in the Fixes introduced in column. If the Fixes introduced in column does not list a version for your branch, then no update candidate currently exists for that branch and F5 recommends upgrading to a version with the fix (refer to the table). If the Fixes introduced in column lists a version prior to the one you are running, in the same branch, then your version should have the fix. Mitigation For BIG-IP and BIG-IQ Until you can install a fixed version, you can use the following sections as temporary mitigations. These mitigations restrict access to iControl REST to only trusted networks or devices, thereby limiting the attack surface. o Block iControl REST access through the self IP address o Block iControl REST access through the management interface Block iControl REST access through the self IP address You can block all access to the iControl REST interface of your BIG-IP or BIG-IQ system through self IP addresses. To do so, you can change the Port Lockdown setting to Allow None for each self IP address in the system. If you must open any ports, you should use the Allow Custom option, taking care to disallow access to iControl REST. By default, iControl REST listens on TCP port 443 or TCP port 8443 on single NIC BIG-IP VE instances. If you modified the default port, ensure that you disallow access to the alternate port you configured. Note: Performing this action prevents all access to the Configuration utility and iControl REST using the self IP address. These changes may also impact other services, including breaking high availability (HA) configurations. Before you make changes to the configuration of your self-IP addresses, F5 strongly recommends that you refer to the following articles: o K17333: Overview of port lockdown behavior (12.x - 17.x) o K39403510: Managing the port lockdown configuration on the BIG-IQ system o K13092: Overview of securing access to the BIG-IP system o K31003634: The Configuration utility of the Single-NIC BIG-IP Virtual Edition now defaults to TCP port 8443 o K51358480: The single-NIC BIG-IP VE may erroneously revert to the default management httpd port after a configuration reload If you must expose port 443 on your self IP addresses and want to restrict access to specific IP ranges, you may consider using the packet filtering functionality built in to the BIG-IP system. For more information, refer to the following article: o K13383: Configuring CIDR Network Addresses for the BIG-IP packet filter For BIG-IQ self IP addresses where port 443 is exposed, use an external packet filtering device such as the BIG-IP Advanced Firewall Manager (AFM). Block iControl REST access through the management interface To mitigate this vulnerability for affected F5 products, you should restrict management access to only trusted users and devices over a secure network. For more information about securing access to BIG-IP or BIG-IQ systems, refer to the following articles: o K13092: Overview of securing access to the BIG-IP system o K46122561: Restricting access to the management interface using network firewall rules o K92748202: Restricting access to the BIG-IQ management interface using network firewall rules o K69354049: Restricting access to the BIG-IP management interface for Configuration Utility and iControl REST services using iptables Note: For BIG-IQ 7.x, secure the management interface by using an external packet filtering device such as the BIG-IP Advanced Firewall Manager (AFM). Supplemental Information 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 K8986: F5 software lifecycle policy o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 17.x) o K15106: Managing BIG-IQ product hotfixes o K15113: BIG-IQ hotfix and point release matrix o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM systems (11.4.x and later) 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. 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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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