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             AUSCERT External Security Bulletin Redistribution

               SOL17113: OpenSSH vulnerability CVE-2015-5600
                              17 August 2015


        AusCERT Security Bulletin Summary

Product:           F5 products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service   -- Remote/Unauthenticated
                   Unauthorised Access -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-5600  

Reference:         ESB-2015.2113

Original Bulletin: 

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SOL17113: OpenSSH vulnerability CVE-2015-5600

Security Advisory

Original Publication Date: 08/14/2015


The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 
6.9 does not properly restrict the processing of keyboard-interactive devices
within a single connection, which makes it easier for remote attackers to 
conduct brute-force attacks or cause a denial of service (CPU consumption) via
a long and duplicative list in the ssh -oKbdInteractiveDevices option, as 
demonstrated by a modified client that provides a different password for each
pam element on this list. (CVE-2015-5600)

Impact Remote attackers may be able to conduct brute-force attacks or cause a
denial-of-service (DoS) by way of the ssh -oKbdInteractiveDevices option.


F5 Product Development has assigned ID 534633 (BIG-IP), ID 535886 (BIG-IQ), ID
535889 (Enterprise Manager), ID 431179 (ARX), and LRS-59845 (LineRate), to 
this vulnerability, and has evaluated the currently supported releases for 
potential 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 

Product 				Versions known to be vulnerable 	Versions known to be not vulnerable 	Severity 	Vulnerable component or feature

BIG-IP LTM 				11.0.0 - 11.6.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP AAM 				11.4.0 - 11.6.0				None					Medium 		sshd

BIG-IP AFM 				11.3.0 - 11.6.0				None					Medium 		sshd

BIG-IP Analytics 			11.0.0 - 11.6.0				None					Medium 		sshd

BIG-IP APM 				11.0.0 - 11.6.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP ASM 				11.0.0 - 11.6.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP Edge Gateway			11.0.0 - 11.3.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP GTM 				11.0.0 - 11.6.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP Link Controller 			11.0.0 - 11.6.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP PEM 				11.3.0 - 11.6.0				None					Medium 		sshd

BIG-IP PSM 				11.0.0 - 11.4.1
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP WebAccelerator 			11.0.0 - 11.3.0
					10.1.0 - 10.2.4				None					Medium 		sshd

BIG-IP WOM 				11.0.0 - 11.3.0
					10.1.0 - 10.2.4				None					Medium 		sshd

ARX 					6.0.0 - 6.4.0				None					Medium 		sshd

Enterprise Manager 			3.0.0 - 3.1.1
					2.1.0 - 2.3.0				None					Medium 		sshd

FirePass 				None					7.0.0
										6.0.0 - 6.1.0				Not vulnerable 	None

BIG-IQ Cloud 				4.0.0 - 4.5.0				None					Medium 		sshd

BIG-IQ Device 				4.2.0 - 4.5.0				None					Medium 		sshd

BIG-IQ Security 			4.0.0 - 4.5.0				None					Medium 		sshd

BIG-IQ ADC 				4.5.0					None					Medium 		sshd

LineRate 				2.5.0 - 2.6.1				None					High 		sshd

F5 WebSafe 				None					1.0.0					Not vulnerable 	None

Traffix SDC 				None					4.0.0 - 4.1.0
										3.3.2 - 3.5.1				Not vulnerable 	None

Note: As of February 17, 2015, AskF5 Security Advisory articles include the 
Severity value. Security Advisory articles published before this date do not 
list a Severity value.

Recommended Action

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. If the listed version is older than the version you are 
currently running, or if the table does not list any version in the column, 
then no upgrade candidate currently exists.

F5 responds to vulnerabilities in accordance with the Severity values 
published in the previous table. The Severity values and other security 
vulnerability parameters are defined in SOL4602: Overview of the F5 security 
vulnerability response policy.

To mitigate this vulnerability, you should permit management access to F5 
products only over a secure network and limit shell access to trusted users. 
For more information, refer to SOL13309: Restricting access to the 
Configuration utility by source IP address (11.x) and SOL13092: Overview of 
securing access to the BIG-IP system. In addition, secure the BIG-IP system 
from unwanted connection attempts by controlling the level of access to each 
self IP address defined on the system. For more information, refer to 
SOL13250: Overview of port lockdown behavior (10.x - 11.x).

Supplemental Information

SOL11719: Mitigating risk from SSH brute force login attacks

SOL9970: Subscribing to email notifications regarding F5 products

SOL9957: Creating a custom RSS feed to view new and updated documents

SOL4918: Overview of the F5 critical issue hotfix policy

SOL167: Downloading software and firmware from F5

SOL13123: Managing BIG-IP product hotfixes (11.x)

SOL10942: Installing OPSWAT hotfixes on BIG-IP APM systems

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