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Submission: On May 04 via manual from AU — Scanned from DE
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Impact A remote attacker could send specially crafted XML which, when parsed by an application using the Expat library, would result in a buffer over-read and cause the application to stop responding. SECURITY ADVISORY STATUS F5 Product Development has assigned ID 1093749 and 1097717 (BIG-IP), 1098829 (iControl), and 1098829-9 (BIG-IQ) 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. Product Branch Versions known to be vulnerable1 Fixes introduced in Severity CVSSv3 score2 Vulnerable component or feature BIG-IP ASM 17.x 17.0.0 None High 8.8 Control plane 16.x 16.1.0 - 16.1.2 None 15.x 15.1.0 - 15.1.5 None 14.x 14.1.0 - 14.1.4 None 13.x 13.1.0 - 13.1.5 None 12.x 12.1.0 - 12.1.6 None 11.x 11.6.1 - 11.6.5 None BIG-IP DNS 17.x 17.0.0 None High 8.8 DNS module 16.x 16.1.0 - 16.1.2 None 15.x 15.1.0 - 15.1.5 None 14.x 14.1.0 - 14.1.4 None 13.x 13.1.0 - 13.1.5 None 12.x 12.1.0 - 12.1.6 None 11.x 11.6.1 - 11.6.5 None BIG-IP (all other modules) 17.x 17.0.0 None High 8.8 iControl SOAP 16.x 16.1.0 - 16.1.2 None 15.x 15.1.0 - 15.1.5 None 14.x 14.1.0 - 14.1.4 None 13.x 13.1.0 - 13.1.5 None 12.x 12.1.0 - 12.1.6 None 11.x 11.6.1 - 11.6.5 None BIG-IQ Centralized Management 8.x 8.0.0 - 8.2.0 None High 8.8 iControl SOAP 7.x 7.0.0 - 7.1.0 None F5OS-A 1.x None Not applicable Not vulnerable None None F5OS-C 1.x None Not applicable Not vulnerable None None Traffix SDC 5.x None Not applicable Not vulnerable None None 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 Important: F5 recommends that you install a fixed software version to fix this vulnerability. If you cannot update quickly, you can use the following sections as temporary configuration mitigations until updating is complete: BIG-IP ASM * Do not write any custom scripts or tools using Expat. Be cautious when manually editing ASM XML security policies, as it is theoretically possible to manually add content to the ASM XML security policy document that will hit an Expat vulnerability upon importing that policy. The official BIG-IP ASM Module Expat usage is sanitized and is unlikely to lead to any of the vulnerabilities. BIG-IP DNS * To mitigate this vulnerability for the big3d/gtmd processes, restrict connections to port 4353 for only known trusted hosts. * Avoid or limit using remote read/write using iQuery. If needed, allow only known, trusted devices. iControl * Restrict access to the known, good source IP addresses, and allow access to only trusted users; this can reduce the impact of this vulnerability. BIG-IQ * Restrict access to the known, good source IP addresses, and allow access to only trusted users; this can reduce the impact of this vulnerability. Restricting Access * Self IP addresses Addresses unauthenticated and authenticated attackers on self IP addresses by blocking all access. * Management interface Addresses unauthenticated attackers on the management interface by restricting access. Self IP addresses You can block all access to the Configuration utility of your BIG-IP system using 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 the Configuration utility. By default, the Configuration utility listens on TCP port 443; however, beginning in BIG-IP 13.0.0, Single-NIC BIG-IP VE deployments use TCP port 8443. Alternatively, you can configure a custom port. Note: Performing this action prevents all access to the Configuration utility 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: * K17333: Overview of port lockdown behavior (12.x - 16.x) * K13092: Overview of securing access to the BIG-IP system * K31003634: The Configuration utility of the Single-NIC BIG-IP Virtual Edition now defaults to TCP port 8443 * K51358480: The single-NIC BIG-IP VE may erroneously revert to the default management httpd port after a configuration reload Management interface To mitigate this vulnerability for affected F5 products, you should permit management access to F5 products only over a secure network. For more information about securing access to BIG-IP systems, refer to K13309: Restricting access to the Configuration utility by source IP address (11.x - 16.x) and K13092: Overview of securing access to the BIG-IP system. Note: Until a fixed release is installed, authenticated users accessing the Configuration utility will always be able to exploit this vulnerability. SUPPLEMENTAL INFORMATION * K41942608: Overview of security advisory articles * K4602: Overview of the F5 security vulnerability response policy * K4918: Overview of the F5 critical issue hotfix policy * K8986: F5 software lifecycle policy * K9502: BIG-IP hotfix and point release matrix * K13123: Managing BIG-IP product hotfixes (11.x - 17.x) * K15106: Managing BIG-IQ product hotfixes * K15113: BIG-IQ hotfix and point release matrix * K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM systems (11.4.x and later) * K167: Downloading software and firmware from F5 * K9970: Subscribing to email notifications regarding F5 products * K9957: Creating a custom RSS feed to view new and updated documents Applies to: Product: BIG-IQ, BIG-IQ Centralized Management 8.2.0, 8.1.0, 8.0.0, 7.1.0, 7.0.0 Product: BIG-IP, BIG-IP AFM, BIG-IP Analytics, BIG-IP APM, BIG-IP ASM, BIG-IP DNS, BIG-IP FPS, BIG-IP GTM, BIG-IP Link Controller, BIG-IP LTM, BIG-IP PEM, BIG-IP AAM 17.0.0, 16.1.2, 16.1.1, 16.1.0, 15.1.5, 15.1.4, 15.1.3, 15.1.2, 15.1.1, 15.1.0, 14.1.4, 14.1.3, 14.1.2, 14.1.0, 13.1.5, 13.1.4, 13.1.3, 13.1.1, 13.1.0, 12.1.6, 12.1.5, 12.1.4, 12.1.3, 12.1.2, 12.1.1, 12.1.0, 11.6.5, 11.6.4, 11.6.3, 11.6.2, 11.6.1 Product: F5OS, F5OS-A, F5OS-C 1.3.1, 1.3.0, 1.2.2, 1.2.1, 1.2.0, 1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.1.0, 1.0.1, 1.0.0 Product: Traffix SDC 5.2.0, 5.1.0 Product: F5 App Protect, F5 SSL Orchestrator, F5 DDoS Hybrid Defender 17.0.0, 16.1.1, 16.1.0, 15.1.1, 15.1.0, 14.1.4, 14.1.2, 14.1.0 Leave feedback on this article QUICK TASKS * AskF5 YouTube Channel * Diagnose your system with iHealth * Create service request * Manage service requests * Find serial number * Search Bug Tracker * New and updated articles * Subscribe to mailing lists * Contact Support SUPPORT PROGRAMS Regionally located support centers enable F5 to provide support in a number of languages through native-speaking support engineers. 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