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AUSCERT External Security Bulletin Redistribution
ESB-2015.2133
SOL17113: OpenSSH vulnerability CVE-2015-5600
17 August 2015
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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
ESB-2015.1975.2
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/17000/100/sol17113.html
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SOL17113: OpenSSH vulnerability CVE-2015-5600
Security Advisory
Original Publication Date: 08/14/2015
Description
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.
Status
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
table:
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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