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AUSCERT External Security Bulletin Redistribution
ESB-2015.2364
sol17155: TMM vulnerability CVE-2015-4638
9 September 2015
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AusCERT Security Bulletin Summary
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Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4638
Original Bulletin:
https://support.f5.com/kb/en-us/solutions/public/17000/100/sol17155.html
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sol17155: TMM vulnerability CVE-2015-4638
Security Advisory
Original Publication Date: 09/08/2015
Updated Date: 09/08/2015
Description
The Traffic Management Microkernel (TMM) may restart and produce a core file
when a FastL4 virtual server processes a fragmented packet. (CVE-2015-4638
pending)
Impact
TMM may restart and temporarily fail to process traffic.
Status
F5 Product Development has assigned ID 437627, and ID 513034 (BIG-IP)
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 Versions known to Severity Vulnerable component or feature
to be vulnerable be not vulnerable
BIG-IP LTM 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
11.2.1 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
11.0.0 - 11.2.0
10.1.0 - 10.2.4
BIG-IP AAM 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
11.4.0 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
BIG-IP AFM 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
11.3.0 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
BIG-IP 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
Analytics 11.2.1 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
11.0.0 - 11.2.0
BIG-IP APM 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
11.2.1 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
11.0.0 - 11.2.0
10.1.0 - 10.2.4
BIG-IP ASM 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
11.2.1 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
11.0.0 - 11.2.0
10.1.0 - 10.2.4
BIG-IP DNS None 12.0.0 Not vulnerable None
BIG-IP Edge 11.2.1 - 11.3.0 11.0.0 - 11.2.0 Severe FastL4 virtual servers
Gateway 10.1.0 - 10.2.4
BIG-IP GTM 11.6.0 - 11.6.0 HF4 11.6.0 HF5 Severe FastL4 virtual servers
11.2.1 - 11.5.2 11.5.3
11.4.1 HF9
11.0.0 - 11.2.0
10.1.0 - 10.2.4
BIG-IP Link 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
Controller 11.2.1 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
11.0.0 - 11.2.0
10.1.0 - 10.2.4
BIG-IP PEM 11.6.0 - 11.6.0 HF4 12.0.0 Severe FastL4 virtual servers
11.3.0 - 11.5.2 11.6.0 HF5
11.5.3
11.4.1 HF9
BIG-IP PSM 11.2.1 - 11.4.1 11.4.1 HF9 Severe FastL4 virtual servers
11.0.0 - 11.2.0
10.0.0 - 10.2.4
BIG-IP 11.2.1 - 11.3.0 11.0.0 - 11.2.0 Severe FastL4 virtual servers
WebAccelerator 10.0.0 - 10.2.4
BIG-IP WOM 11.2.1 - 11.3.0 11.0.0 - 11.2.0 Severe FastL4 virtual servers
10.0.0 - 10.2.4
ARX None 6.0.0 - 6.4.0 Not vulnerable None
Enterprise None 3.0.0 - 3.1.1 Not vulnerable None
Manager
FirePass None 7.0.0 Not vulnerable None
6.0.0 - 6.1.0
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
LineRate None 2.5.0 - 2.6.0 Not vulnerable None
F5 WebSafe None 1.0.0 Not vulnerable None
Traffix SDC None 4.0.0 - 4.4.0 Not vulnerable None
3.3.2 - 3.5.1
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.
Mitigating this vulnerability
To mitigate this vulnerability, you can modify the FastL4 profile and
enable the Reassemble IP Fragments option. To enable the Reassemble IP
Fragments option using the Traffic Management Shell (tmsh), perform the
following steps:
Log in to the Traffic Management Shell (tmsh) by typing the following
command:
tmsh
To modify the FastL4 profile and enable the Reassemble IP Fragments
option, use the following syntax:
modify /ltm profile fastl4 <profile_name> reassemble-fragments enabled
For example, to enable the Reassemble IP Fragments option for the
FastL4 profile named MyFastL4, type the following command:
modify /ltm profile fastl4 MyFastL4 reassemble-fragments enabled
To save the configuration, type the following command:
save /sys config
Supplemental Information
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)
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