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AUSCERT External Security Bulletin Redistribution
ESB-2019.3057
BIG-IP mcpd vulnerability CVE-2019-6647
12 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6647
Original Bulletin:
https://support.f5.com/csp/article/K87920510
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K87920510:BIG-IP mcpd vulnerability CVE-2019-6647
Security Advisory
Original Publication Date: 09 Aug, 2019
Security Advisory Description
When processing authentication attempts for control-plane users, mcpd leaks a
small amount of memory. Under rare conditions, attackers with access to the
management interface can eventually deplete memory on the system. (
CVE-2019-6647)
Impact
Repeated failed authentication attempts progressively increase memory usage,
potentially leading to a fail-over event when memory is exhausted. The rate of
memory use increase is small, but an attack at scale may trigger low-memory
conditions eventually depleting memory and affecting the operation of the
Traffic Management Microkernel (TMM) and other components.
Security Advisory Status
F5 Product Development has assigned ID 757455 (BIG-IP) to this vulnerability.
To determine if your product and version have been evaluated for this
vulnerability, refer to the Applies to (see versions) box. 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. For more information
about security advisory versioning, refer to K51812227: Understanding Security
Advisory versioning.
+-------------------+------+----------+----------+----------+------+----------+
| | |Versions |Fixes | |CVSSv3|Vulnerable|
|Product |Branch|known to |introduced|Severity |score |component |
| | |be |in | | |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |None |15.0.0 | | | |
| +------+----------+----------+ | | |
| | |14.1.0 |14.1.0.6 | | | |
|BIG-IP (LTM, AAM, |14.x +----------+----------+ | | |
|AFM, Analytics, | |14.0.0 |14.0.0.5 | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |13.0.0 - |13.1.3 |Medium |5.3 |mcpd |
|Link Controller, | |13.1.1 | | | | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |12.1.5 | | | |
| | |12.1.4 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.1 - |None | | | |
| | |11.6.4 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |5.x |None |Not | | | |
| | | |applicable|Not | | |
|Traffix SDC +------+----------+----------+vulnerable|None |None |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
Security Advisory 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 Fixes introduced in 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.
Mitigation
To mitigate this vulnerability, management port access should be limited to
trusted and secure networks. For more information, refer to K13092: Overview
of securing access to the BIG-IP system. In addition, BIG-IP AFM systems can
use iptables firewall rules to limit management access to trusted sources.
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