13 February 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.0369 sol16135: OpenSSL vulnerability CVE-2015-0205 13 February 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-0205 Reference: ASB-2015.0015 ESB-2015.0318 ESB-2015.0317 ESB-2015.0291 ESB-2015.0149 ESB-2015.0101 ESB-2015.0056 ESB-2015.0048.2 Original Bulletin: https://support.f5.com/kb/en-us/solutions/public/16000/100/sol16135.html - --------------------------BEGIN INCLUDED TEXT-------------------- sol16135: OpenSSL vulnerability CVE-2015-0205 Security Advisory Original Publication Date: 02/12/2015 Description The ssl3_get_cert_verify function in s3_srvr.c in OpenSSL 1.0.0 before 1.0.0p and 1.0.1 before 1.0.1k accepts client authentication with a Diffie-Hellman (DH) certificate without requiring a CertificateVerify message, which allows remote attackers to obtain access without knowledge of a private key via crafted TLS Handshake Protocol traffic to a server that recognizes a Certification Authority with DH support. (CVE-2015-0205) Impact If you have enabled client certificate authentication for the BIG-IP Configuration utility, a remote attacker with a client certificate that contains a static Diffie-Hellman (DH) key may be able to authenticate successfully without a private key and gain access to the BIG-IP Configuration utility. The affected client certificate must be signed by a Certificate Authority (CA) that is trusted by the BIG-IP system. By default, the BIG-IP Configuration utility does not use client certificate authentication for access control. Status F5 Product Development has assigned ID 500092 (BIG-IP) and LRS-37958 (LineRate) to this vulnerability, and has evaluated the currently supported releases for potential vulnerability. 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: Product Versions known to be vulnerable Versions known to be not vulnerable Vulnerable component or feature BIG-IP LTM 11.5.0 - 11.6.0 11.0.0 - 11.4.1 10.1.0 - 10.2.4 Configuration utility BIG-IP AAM 11.5.0 - 11.6.0 11.4.0 - 11.4.1 Configuration utility BIG-IP AFM 11.5.0 - 11.6.0 11.3.0 - 11.4.1 Configuration utility BIG-IP Analytics 11.5.0 - 11.6.0 11.0.0 - 11.4.1 Configuration utility BIG-IP APM 11.5.0 - 11.6.0 11.0.0 - 11.4.1 10.1.0 - 10.2.4 Configuration utility BIG-IP ASM 11.5.0 - 11.6.0 11.0.0 - 11.4.1 10.1.0 - 10.2.4 Configuration utility BIG-IP GTM 11.5.0 - 11.6.0 11.0.0 - 11.4.1 10.1.0 - 10.2.4 Configuration utility BIG-IP Link Controller 11.5.0 - 11.6.0 11.0.0 - 11.4.1 10.1.0 - 10.2.4 Configuration utility BIG-IP PEM 11.5.0 - 11.6.0 11.3.0 - 11.4.1 Configuration utility LineRate 2.5.0 2.4.0 - 2.4.2 None OpenSSL Recommended Action If the previous table lists a version in the Versions known to be not vulnerable column, you can eliminate this vulnerability by upgrading to the listed version. If the listed version is older than the version you are currently running, or if the table does not list any version in the column, then no upgrade candidate currently exists. F5 is responding to this vulnerability as determined by the parameters defined in SOL4602: Overview of the F5 security vulnerability response policy. BIG-IP To mitigate this vulnerability, you should consider the following recommendations: Revoke and reissue the affected client certificates, if applicable, for your environment. Disable client certificate authentication for the BIG-IP Configuration utility. To disable client certificate authentication for the BIG-IP Configuration utility, perform the following procedure: Impact of action: Performing the following procedure should not have a negative impact on your system. Log in to the tmsh utility. Disable the client certificate authentication by typing the following command: modify /sys httpd ssl-ca-cert-file none ssl-verify-client no Save the configuration to the configuration files by typing the following command: save /sys config LineRate To mitigate the risk posed by this vulnerability for the affected LineRate versions, you can remove the affected trusted Certificate Authority in the SSL component. For information about removing trusted Certificate Authority for LineRate, refer to the following guides: Note: The following links take you to a resource outside of AskF5. The third party could remove the documents without our knowledge. The SSL Mode Commands chapter of the LineRate 2.5.0 CLI Reference Guide The SSL Mode Commands chapter of the LineRate 2.4.x CLI Reference Guide Supplemental Information SOL9970: Subscribing to email notifications regarding F5 products SOL9957: Creating a custom RSS feed to view new and updated documents SOL4602: Overview of the F5 security vulnerability response policy SOL4918: Overview of the F5 critical issue hotfix policy - --------------------------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 firstname.lastname@example.org and we will forward your request to the appropriate person. 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