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             AUSCERT External Security Bulletin Redistribution

          sol70191975: Apache Xerces vulnerability CVE-2016-4463
                             16 September 2016


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP APM
                   F5 ARX
                   F5 Enterprise Manager
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2016-4463  

Reference:         ESB-2016.1626

Original Bulletin: 

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sol70191975: Apache Xerces vulnerability CVE-2016-4463

Security Advisory

Original Publication Date: 09/15/2016

Vulnerability Description

Stack-based buffer overflow in Apache Xerces-C++ before 3.1.4 allows 
context-dependent attackers to cause a denial of service via a deeply nested 
DTD. (CVE-2016-4463)


An attacker requires privileged access to a dynamically generated XML file to
exploit one of the affected components of the BIG-IP APM system. Additionally,
an attacker must have access to a privileged user in order to download a 
malformed XML file on the system to trigger the exploit.

Security Issue Status

F5 Product Development has assigned ID 612393 (BIG-IP), ID 599815 (Enterprise
Manager), and ID 595939 (ARX) 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 

Product                         Versions known to be vulnerable    Versions known to be not vulnerable    Severity        Vulnerable component or feature
BIG-IP APM                      12.0.0 - 12.1.1                    11.2.1                                 Medium          PolicySync and the samlidpd daemon
                                11.4.0 - 11.6.1                    10.2.1 - 10.2.4
ARX                             6.2.0 - 6.4.0                      None                                   Low             XML parser
Enterprise Manager              3.1.1                              None                                   Medium          EM daemons

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 determine the necessary upgrade path for your BIG-IQ system, you should 
understand the BIG-IQ product offering name changes. For more information, 
refer to SOL21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow 


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, 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

SOL167: Downloading software and firmware from F5

SOL13123: Managing BIG-IP product hotfixes (11.x - 12.x)

SOL9502: BIG-IP hotfix matrix

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