ESB-2017.2293 - [Appliance] F5 Products: Access privileged data - Remote with user interaction 2017-09-12

Printable version
PGP/GPG verifiable version

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2293
      K14059: CRIME vulnerability via the SPDY protocol CVE-2012-4930
                             12 September 2017

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

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

Product:           F5 Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Privileged Data         -- Remote with User Interaction
                   Provide Misleading Information -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-4930  

Original Bulletin: 
   https://support.f5.com/csp/article/K14059

- --------------------------BEGIN INCLUDED TEXT--------------------

K14059: CRIME vulnerability via the SPDY protocol CVE-2012-4930

Security Advisory

Original Publication Date: Dec 20, 2012

Updated Date: Sep 12, 2017

Applies to (see versions):

Security Advisory Description

The SPDY protocol 3, and earlier, can perform TLS encryption of compressed 
data without properly obfuscating the length of the unencrypted data. This 
allows man-in-the-middle attackers to obtain plain text HTTP headers by 
observing length differences during a series of guesses in which a string in 
an HTTP request potentially matches an unknown string in an HTTP header. The 
SPDY protocol 3, and earlier, is used in Mozilla Firefox, Google Chrome, and 
other products. (CVE-2012-4930)

Impact

Connections to virtual servers configured with the SPDY profile may be at 
risk.

Security Advisory Status

F5 Product Development has assigned ID 337371 (BIG-IP and Enterprise Manager)
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     	Versions known     	Vulnerable component or feature
			to be vulnerable	to be not vulnerable
BIG-IP LTM              12.0.0 - 12.1.2         11.0.0 - 11.1.0         Virtual servers configured to use a SPDY profile
                        11.4.0 - 11.6.1         10.0.0 - 10.2.4
                        11.2.0 - 11.3.0*        9.0.0 - 9.4.8
BIG-IP GTM              None                    11.x                    None
                                                10.x
9.x
BIG-IP ASM              None                    11.x                    None
                                                10.x
9.x
BIG-IP Link Controller  None                    11.x                    None
                                                10.x
9.x
BIG-IP WebAccelerator   12.0.0 - 12.1.2         11.0.0 - 11.1.0         Virtual servers configured to use a SPDY profile
                        11.4.0 - 11.6.1         10.0.0 - 10.2.4
                        11.2.0 - 11.3.0*        9.0.0 - 9.4.8
BIG-IP PSM              None                    11.x                    None
                                                10.x
9.x
BIG-IP WOM              None                    10.x                    None
                                                11.x
BIG-IP APM              None                    11.x                    None
                                                10.x
BIG-IP Edge Gateway     11.2.0 - 11.3.0*        11.0.0 - 11.1.0         Virtual servers configured to use a SPDY profile
                                                10.1.0 - 10.2.4
BIG-IP Analytics        None                    11.x                    None
BIG-IP AFM              None                    11.x                    None
BIG-IP PEM              None                    11.x                    None
BIG-IP AAM              None                    11.x                    None
FirePass                None                    7.x                     None
                                                6.x
Enterprise Manager      None                    3.x                     None
                                                2.x
1.x
ARX                     None                    6.x                     None
                                                5.x
BIG-IQ Cloud            None                    4.x                     None
BIG-IQ Device           None                    4.x                     None
BIG-IQ Security         None                    4.x                     None
LineRate                None                    2.x                     None
                                                1.x

* Versions 11.2.0 through 11.3.0 require an Early Access (EA) license to 
enable the vulnerable feature (SPDY profile). EA features are not intended for
production use.

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 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 either disable SPDY compression or use
an HTTP/2.0 profile. To do so, perform one of the following workarounds:

Using an HTTP/2 profile (12.0.0)

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

If you are using BIG-IP 12.0.0 and later, you can configure the BIG-IP system
to use an HTTP/2.0 profile. For more information, refer to the Managing HTTP 
Traffic with the HTTP2 Profile section of the BIG-IP Local Traffic Manager: 
Implementations guide.

Note: For information about how to locate F5 product guides, refer to 
K12453464: Finding product documentation on AskF5.

Disabling SPDY compression (11.2.0 - 11.6.0)

Note: Although the HTTP/2.0 profile was introduced in 11.6.0, it is considered
experimental and not intended for use in production.

Impact of action: Performing the recommended workaround causes HTTP 
compression to be performed by hardware instead or software, resulting in 
increased CPU usage.

SPDY compression is done asymmetrically. To mitigate this vulnerability for 
client requests, you should update the client browser to a patched version 
that has SPDY compression disabled. For responses from BIG-IP to the client, 
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 or, if you are using BIG-IP 11.4.0 and later, you can configure
the Compression Level to 0 for all SPDY profiles in use.

Supplemental Information

K14054: CRIME vulnerability via TLS 1.2 protocol CVE-2012-4929

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

- --------------------------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:

        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
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).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
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=ZZf5
-----END PGP SIGNATURE-----

« Back to bulletins