Operating System:

[Appliance]

Published:

09 September 2015

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2364
                 sol17155: TMM vulnerability CVE-2015-4638
                             9 September 2015

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

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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