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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.0385
               K05121675: F5 TLS vulnerability CVE-2016-9244
                              9 February 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           F5 BIG IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2016-9244  

Original Bulletin: 
   https://support.f5.com/csp/article/K05121675

Comment: According to the currently available information, iterative 
         exploitation attempts may result in compromised private keys. Users 
         of affected F5 products are advised to apply the recommended 
         mitigations and regenerate private keys if a compromise is suspected.

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K05121675: F5 TLS vulnerability CVE-2016-9244

Security Advisory

Original Publication Date: Feb 09, 2017

Updated Date: Feb 09, 2017

Applies to (see versions):

Vulnerability Description

A BIG-IP SSL virtual server with the non-default Session Tickets option 
enabled may leak up to 31 bytes of uninitialized memory. (CVE-2016-9244)

Impact

A BIG-IP virtual server configured with a Client SSL profile that has the 
non-default Session Tickets option enabled may leak up to 31 bytes of 
uninitialized memory. A remote attacker may exploit this vulnerability to 
obtain Secure Sockets Layer (SSL) session IDs from other sessions. It is 
possible that other data from uninitialized memory may be returned as well.

Security Issue Status

F5 Product Development has assigned ID 596340 (BIG-IP) to this 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    Severity        Vulnerable component or feature
BIG-IP LTM                      12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1                    11.2.1
BIG-IP AAM                      12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1
BIG-IP AFM                      12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1
BIG-IP Analytics                12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1                    11.2.1
BIG-IP APM                      12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1                    11.2.1
BIG-IP ASM                      12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1                    11.2.1
BIG-IP DNS                      None                               12.0.0 - 12.1.2                        Not vulnerable  None
BIG-IP Edge Gateway             None                               11.2.1                                 Not vulnerable  None
BIG-IP GTM                      11.4.0 - 11.6.1                    11.6.1 HF2                             High            BIG-IP virtual server*
                                                                   11.2.1
BIG-IP Link Controller          12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1                    11.2.1
BIG-IP PEM                      12.0.0 - 12.1.2                    11.6.1 HF2                             High            BIG-IP virtual server*
                                11.4.0 - 11.6.1
BIG-IP PSM                      11.4.0 - 11.4.1                    None                                   High            BIG-IP virtual server*
BIG-IP WebAccelerator           None                               11.2.1                                 Not vulnerable  None
BIG-IP WebSafe                  None                               12.0.0 - 12.1.2                        Not vulnerable  None
                                                                   11.6.0 - 11.6.1
ARX                             None                               6.2.0 - 6.4.0                          Not vulnerable  None
Enterprise Manager              None                               3.1.1                                  Not vulnerable  None
BIG-IQ Cloud                    None                               4.0.0 - 4.5.0                          Not vulnerable  None
BIG-IQ Device                   None                               4.2.0 - 4.5.0                          Not vulnerable  None
BIG-IQ Security                 None                               4.0.0 - 4.5.0                          Not vulnerable  None
BIG-IQ ADC                      None                               4.5.0                                  Not vulnerable  None
BIG-IQ Centralized Management   None                               5.0.0 - 5.1.0                          Not vulnerable  None
                                                                   4.6.0
BIG-IQ Cloud and Orchestration  None                               1.0.0                                  Not vulnerable  None
F5 iWorkflow                    None                               2.0.0 - 2.0.2                          Not vulnerable  None
LineRate                        None                               2.5.0 - 2.6.1                          Not vulnerable  None
Traffix SDC                     None                               5.0.0 - 5.1.0                          Not vulnerable  None
                                                                   4.0.0 - 4.4.0

* The BIG-IP virtual server is associated with the Client SSL profile that has
the Session Ticket option enabled. Vulnerability 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 Versions known to be not vulnerable 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 disable the Session Ticket option on 
the affected Client SSL profile. To do so, perform the following procedure:

Impact of action: Performing the following procedure should not have a 
negative impact on your system.

    Log in to the Configuration utility.
    Navigate to Local Traffic > Profiles > SSL > Client.
    For the Configuration option, select Advanced.
    Clear the Session Ticket check box.
    Click Update.

Acknowledgements

F5 would like to acknowledge Cloudflare Cryptography Engineer Filippo Valsorda
for bringing this issue to our attention, and for following the highest 
standards of responsible disclosure.

Supplemental Information

    K9970: Subscribing to email notifications regarding F5 products
    K9957: Creating a custom RSS feed to view new and updated documents
    K4602: Overview of the F5 security vulnerability response policy
    K4918: Overview of the F5 critical issue hotfix policy
    K167: Downloading software and firmware from F5
    K13123: Managing BIG-IP product hotfixes (11.x - 12.x)
    K9502: BIG-IP hotfix matrix

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