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AUSCERT External Security Bulletin Redistribution
ESB-2016.2047
sol46514822: Linux TCP Stack vulnerability CVE-2016-5696
29 August 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
F5 ARX
F5 Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Virtualisation
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2016-5696
Reference: ESB-2016.1997
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/k/46/sol46514822.html
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sol46514822: Linux TCP Stack vulnerability CVE-2016-5696
Security Advisory
Original Publication Date: 08/26/2016
Vulnerability Description
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly
determine the rate of challenge ACK segments, which makes it easier for
man-in-the-middle attackers to hijack TCP sessions via a blind in-window
attack. (CVE-2016-5696)
Impact
Attackers may be able to hijack network sessions by determining the shared
counter that could be used to determine sequence numbers for TCP stream
injection. Connections to or from the BIG-IP system by administrative
applications such as BIG-IP health monitors, SNMP, SMTP, SSH, NTP, etc., are
processed by the Linux operating system, and may be exploited by this
vulnerability. For more information, refer to SOL13284: Overview of management
interface routing (11.x - 12.x).
Security Issue Status
F5 Product Development has assigned ID 610107 (BIG-IP), ID 461496 (ARX), and
INSTALLER-2561 (Traffix SDC) 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 to be vulnerable Versions known to be not vulnerable Severity Vulnerable component or feature
BIG-IP LTM 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
11.2.1
10.2.1 - 10.2.4
BIG-IP AAM 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
BIG-IP AFM 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
BIG-IP Analytics 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
11.2.1
BIG-IP APM 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
11.2.1
10.2.1 - 10.2.4
BIG-IP ASM 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
11.2.1
10.2.1 - 10.2.4
BIG-IP DNS 12.0.0 - 12.1.1 None Medium Linux kernel
BIG-IP Edge Gateway None 11.2.1 Not vulnerable None
10.2.1 - 10.2.4
BIG-IP GTM None 11.4.0 - 11.6.1 Not vulnerable None
11.2.1
10.2.1 - 10.2.4
BIG-IP Link Controller 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
11.2.1
10.2.1 - 10.2.4
BIG-IP PEM 12.0.0 - 12.1.1 11.4.0 - 11.6.1 Medium Linux kernel
BIG-IP PSM None 11.4.0 - 11.4.1 Not vulnerable None
10.2.1 - 10.2.4
BIG-IP WebAccelerator None 11.2.1 Not vulnerable None
10.2.1 - 10.2.4
BIG-IP WOM None 11.2.1 Not vulnerable None
10.2.1 - 10.2.4
BIG-IP WebSafe 12.0.0 - 12.1.1 11.6.0 - 11.6.1 Medium Linux kernel
ARX 6.2.0 - 6.4.0 None Low Linux kernel
Enterprise Manager None 3.1.1 Not vulnerable None
FirePass None 7.0.0 Not vulnerable None
BIG-IQ Cloud None 4.0.0 - 4.5.0 Not vulnerable None
BIG-IQ Device None 4.2.0 - 4.5.0 Not vulnerable None
BIG-IQ Security None 4.0.0 - 4.5.0 Not vulnerable None
BIG-IQ ADC None 4.5.0 Not vulnerable None
BIG-IQ Centralized Management None 5.0.0 Not vulnerable None
4.6.0
BIG-IQ Cloud and Orchestration None 1.0.0 Not vulnerable None
F5 iWorkflow None 2.0.0 Not vulnerable None
LineRate None 2.5.0 - 2.6.1 Not vulnerable None
Traffix SDC 5.0.0 None Low Linux kernel
4.0.0 - 4.4.0
Vulnerability 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.
To mitigate this vulnerability, you should permit management access to F5
products only over a secure network and limit shell access to only trusted
users. For more information for the BIG-IP system, refer to SOL13309:
Restricting access to the Configuration utility by source IP address (11.x -
12.x) and SOL13092: Overview of securing access to the BIG-IP system.
Supplemental Information
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
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