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AUSCERT External Security Bulletin Redistribution
ESB-2013.0177
sol14190: TLS / DTLS 'Lucky 13' vulnerability
11 February 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP LTM
BIG-IP AFM
BIG-IP Analytics
BIG-IP APM
BIG-IP ASM
BIG-IP Edge Gateway
BIG-IP GTM
BIG-IP Link Controller
BIG-IP PEM
BIG-IP PSM
BIG-IP WebAccelerator
BIG-IP WOM
ARX
Enterprise Manager
FirePass
Publisher: F5
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-0169
Reference: ESB-2013.0161
Original Bulletin:
http://support.f5.com/kb/en-us/solutions/public/14000/100/sol14190.html
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sol14190: TLS / DTLS 'Lucky 13' vulnerability CVE-2013-0169
Security Advisory
Original Publication Date: 02/08/2013
Description
A vulnerability exists in the TLS and DTLS protocols that may allow an attacker
to recover plaintext from TLS / DTLS connections that use CBC-mode encryption.
Note: Stream ciphers, such as RC4, are not vulnerable to this issue.
Impact
The vulnerability may allow an attacker to recover plaintext from TLS / DTLS
connections.
Status
F5 Product Development has assigned ID 407706 (BIG-IP and Enterprise Manager),
ID 410613 (FirePass), and ID 410742 (ARX) to this vulnerability. To find out
whether F5 has determined that your release is vulnerable, and to obtain
information about releases or hotfixes that resolve 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 9.0.0 - 9.6.1 None Configuration utility
10.0.0 - 10.2.4
11.0.0 - 11.3.0 SSL virtual servers
BIG-IP AFM 11.3.0 None Configuration utility
SSL virtual servers
BIG-IP Analytics 11.0.0 - 11.3.0 None Configuration utility
BIG-IP APM 10.1.0 - 10.2.4 None Configuration utility
11.0.0 - 11.3.0
SSL virtual servers
BIG-IP ASM 9.2.0 - 9.4.8 None Configuration utility
10.0.0 - 10.2.4
11.0.0 - 11.3.0 SSL virtual servers
BIG-IP Edge Gateway 10.1.0 - 10.2.4 None Configuration utility
11.0.0 - 11.3.0
SSL virtual servers
BIG-IP GTM 9.2.2 - 9.4.8 None Configuration utility
10.0.0 - 10.2.4
11.0.0 - 11.3.0
BIG-IP Link Controller 9.2.2 - 9.4.8 None Configuration utility
10.0.0 - 10.2.4
11.0.0 - 11.3.0 SSL virtual servers
BIG-IP PEM 11.3.0 None Configuration utility
SSL virtual servers
BIG-IP PSM 9.4.5 - 9.4.8 None Configuration utility
10.0.0 - 10.2.4
11.0.0 - 11.3.0 SSL virtual servers
BIG-IP WebAccelerator 9.4.0 - 9.4.8 None Configuration utility
10.0.0 - 10.2.4
11.0.0 - 11.3.0 SSL virtual servers
BIG-IP WOM 10.0.0 - 10.2.4 None Configuration utility
11.0.0 - 11.3.0
SSL virtual servers
ARX 5.0.0 - 5.3.1 None ARX Manager GUI
6.0.0 - 6.3.0
API (disabled by default)
Enterprise Manager 1.6.0 - 1.8.0 None Configuration utility
2.0.0 - 2.3.0
3.0.0 - 3.1.0
FirePass 6.0.0 - 6.1.0 None Administrative interface
7.0.0
WebServices
Recommended action
BIG-IP
FirePass
Enterprise Manager
ARX
BIG-IP
The following section describes affected BIG-IP components and how to protect
the components from potential exploit.
The Configuration utility
The BIG-IP Configuration utility is vulnerable. To mitigate potential
exploit, F5 recommends that you limit network access to the MGMT
interface to a secure, management-only network.
It is also possible to change the default cipher string for the BIG-IP
Configuration utility. For example, to change the cipher string for the
Configuration utility to use the RC4-SHA cipher, refer to the following
commands:
BIG-IP 10.x - 11.x
tmsh modify /sys httpd ssl-ciphersuite RC4-SHA
BIG-IP 9.4.x
bigpipe httpd sslciphersuite RC4-SHA
SSL virtual servers
SSL virtual servers on F5 hardware appliances and blades
SSL virtual servers running on F5 hardware appliances and blades are
not vulnerable. If you have an F5 hardware appliance or blade, F5
recommends using the default cipher string for clientSSL profiles. To
verifiy the cipher string, navigate to Local Traffic > Profiles > SSL >
Client > {profile_name} > Configuration > Advanced > Ciphers.
If the cipher string is set to DEFAULT, the virtual server is not
vulnerable.
SSL virtual servers on F5 virtual editions (VE)
SSL virtual servers running on F5 virtual editions (VE) are vulnerable.
To mitigate this vulnerability configure the client-side SSL profile to
prefer RC4-SHA ciphers. To do so, perform the Configuring the SSL
profile to prefer RC4 ciphers procedure:
Configuring the SSL profile to prefer RC4 ciphers
To configure the SSL profile to prefer RC4-SHA ciphers, perform the following
procedure:
Impact of workaround: Changing the ciphers supported by the SSL profile may
result in clients being unable to establish an SSL connection.
1. Log in to the Configuration utility.
2. Click Local Traffic.
3. Click Profiles.
4. Choose Client from the SSL drop-down menu.
5. Click Create.
6. Type a name for the SSL profile.
7. Choose clientssl from the Parent Profile drop-down menu.
8. Choose Advanced from the Configuration drop-down menu.
9. Click the Custom box for Ciphers.
10. Delete the DEFAULT cipher string from the Ciphers box.
11. Enter the desired cipher string in the Ciphers box.
For example, the following string would configure an SSL profile to use
the Native SSL stack and prefer RC4-SHA ciphers:
RC4-SHA:NATIVE:!EXP:!DES:!MD5
12. Click Finished.
You must now associate the SSL profile with the virtual server.
FirePass
To protect the Firepass Controller Administrator interface from potential
exploit, perform the following procedure:
Changing the cipher string for the Firepass Administrator interface
Impact of procedure: Changing the cipher string may prevent some connections to
the Administrator interface.
1. Log in to the Firepass Administrator interface.
2. Navigate to Device Management > Security > User Access Security page >
SSL Cipher Security.
3. Click Medium-Grade Security.
4. Click Apply.
Enterprise Manager
To protect the Enterprise Manager Configuration utility from potential exploit,
F5 recommends that you limit network access to the MGMT interface to a secure,
management-only network.
It is also possible to change the default cipher string for the Enterprise
Manager Configuration utility. For example, to change the cipher string for the
Configuration utility to use the RC4-SHA cipher, refer to the following
commands:
Enterprise Manager 3x
tmsh modify /sys httpd ssl-ciphersuite RC4-SHA
Enterprise Manager 2.x
bigpipe httpd sslciphersuite RC4-SHA
ARX
The following section describes how to protect the ARX Manager GUI from
potential exploit (6.2.0 and later).
Changing the ARX Manager GUI cipher string (6.2.0 and later)
To change the ARX Manager GUI cipher string, perform the following procedure:
Impact of procedure: Changing the cipher string may prevent some connections to
the ARX Manager GUI.
1. Log in to the ARX CLI.
Enable privileged mode by typing the following command:
2. enable
Enable config mode by typing the following command:
config
3. Enter ssl mode by entering the following command:
ssl
4. Change the cipher string by entering the following command
cipher ssl-rsa-with-rc4-128-sha
5. Exit from the menu by entering the following command:
end
Acknowledgments
F5 would like to acknowledge Nadhem J. AlFardan and Kenneth G. Paterson of the
Information Security Group Royal Holloway, University of London for bringing
this issue to our attention, and for following the highest standards of
responsible disclosure.
Supplemental Information
CVE-2013-0169
http://www.isg.rhul.ac.uk/tls/
SOL8802: Using SSL ciphers with BIG-IP Client SSL and Server SSL profiles
SOL13405: Restricting Configuration utility access to clients using high encryption SSL ciphers (11.x)
SOL6768: Restricting Configuration utility access to clients using high encryption SSL ciphers (9.x - 10.x)
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
SOL9502: BIG-IP hotfix matrix
SOL10322: FirePass hotfix matrix
SOL12766: ARX hotfix matrix
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