Bug ID 718812: Removed 3des-cbc from default cipher list for SSHD.

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP TMOS(all modules)

Known Affected Versions:
10.1.0, 10.2.1, 10.2.2, 10.2.3, 10.2.4, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.1, 11.6.2, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1

Fixed In:
14.1.0

Opened: May 07, 2018

Severity: 3-Major

Symptoms

3des-cbc is still available in the default cipher list for the SSH daemon (sshd) on the BIG-IP management address.

Impact

There is no specific impact, however, many open source projects (e.g., OpenSSL) and international certification standards (e.g., Common Criteria) have deprecated support for 3DES-based ciphers.

Conditions

Using cipher 3des-cbc in the default configuration.

Workaround

None.

Fix Information

Removed 3des-cbc from default cipher list for sshd. Important: Clients that support only 3des-cbc will no longer be able to connect to the BIG-IP system in the default configuration. For information about restoring 3des-cbc support for configurations that require it, see K80425458: Modifying the list of ciphers and MAC algorithms used by the SSH service on the BIG-IP system or BIG-IQ system :: https://support.f5.com/csp/article/K80425458. The string needed to restore support is '3des-cbc'.

Behavior Change

The cipher 3des-cbc has been included for many releases of BIG-IP software. Starting in this release 3des-cbc has been removed from the default cipher string. This change improves overall security of the BIG-IP system's default configuration of sshd. Important: Clients that support only 3des-cbc will no longer be able to connect to the BIG-IP system in the default configuration. You can restore 3des-cbc support for configurations that require it by modifying the cipher string to include 3des-cbc. For information, see K80425458: Modifying the list of ciphers and MAC algorithms used by the SSH service on the BIG-IP system or BIG-IQ system :: https://support.f5.com/csp/article/K80425458. The string needed to restore support is '3des-cbc'.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips