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             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

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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

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