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AUSCERT External Security Bulletin Redistribution
ESB-2017.2293
K14059: CRIME vulnerability via the SPDY protocol CVE-2012-4930
12 September 2017
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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
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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
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