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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.3219 K42378447: IPsec IKEv1 vulnerability CVE-2018-5389 23 October 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2018-5389 Original Bulletin: https://support.f5.com/csp/article/K42378447 - --------------------------BEGIN INCLUDED TEXT-------------------- K42378447: IPsec IKEv1 vulnerability CVE-2018-5389 Security Advisory Original Publication Date: Oct 23, 2018 Security Advisory Description The Internet Key Exchange v1 main mode is vulnerable to offline dictionary or brute force attacks. Reusing a key pair across different versions and modes of IKE could lead to cross-protocol authentication bypasses. It is well known, that the aggressive mode of IKEv1 PSK is vulnerable to offline dictionary or brute force attacks. For the main mode, however, only an online attack against PSK authentication was thought to be feasible. This vulnerability could allow an attacker to recover a weak Pre-Shared Key or enable the impersonation of a victim host or network. (CVE-2018-5389) Impact BIG-IP There are four types of attacks on the IKEv1 protocol implementations affected by this vulnerability: o Impersonating a device by performing a Bleichenbacher Oracle attack on its IKEv1 implementation of PKE (Public Key Encryption) based authentication. o Impersonating a device by performing a Bleichenbacher Oracle attack on its IKEv1 implementation of RPKE (Revised Public Key Encryption) based authentication. o Impersonating a device by forging its RSA signature through Bleichenbacher Oracle attack on its IKEv1 implementation of the PKE and RPKE-based authentication types. o Performing an offline dictionary attack on a Pre-Shared Key (PSK) based authentication type for IKEv1. The BIG-IP system is not affected by the three impersonating attack types. The BIG-IP system that contains IKEv1 configuration using a weak (low-entropy) PSK is susceptible to the exploit of this vulnerability. Enterprise Manager / BIG-IQ / iWorkflow / Traffix SDC There is no impact for these F5 products; they are not affected by this vulnerability. Security Advisory Status F5 Product Development has assigned ID 741694 (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 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| | | | | +-------------------+------+----------+----------+----------+------+----------+ | |14.x |14.0.0 |None | | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |AFM, Analytics, |13.x |13.0.0 - |None | | | | |APM, ASM, DNS, Edge| |13.1.1 | | | | | |Gateway, FPS, GTM, +------+----------+----------+Medium |5.9 |IPsec | |Link Controller, |12.x |12.1.0 - |None | | |IKEv1 | |PEM, | |12.1.3 | | | | | |WebAccelerator) +------+----------+----------+ | | | | |11.x |11.2.1 - |None | | | | | | |11.6.3 | | | | | +-------------------+------+----------+----------+----------+------+----------+ |Enterprise Manager |3.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ | |6.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | |BIG-IQ Centralized |5.x |None |Not |Not |None |None | |Management | | |applicable|vulnerable| | | | +------+----------+----------+ | | | | |4.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ |BIG-IQ Cloud and |1.x |None |Not |Not |None |None | |Orchestration | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ |F5 iWorkflow |2.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ | |5.x |None |Not | | | | | | | |applicable|Not | | | |Traffix SDC +------+----------+----------+vulnerable|None |None | | |4.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ ^1 The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Security Advisory 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 modify the affected IKEv1 configuration to use a 256 bit or higher entropy for the PSK. Supplemental Information o K51812227: Understanding Security Advisory versioning 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 - 13.x) 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. 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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