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AUSCERT External Security Bulletin Redistribution
ESB-2021.0317.2
NTP vulnerability CVE-2019-11331
17 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP Products
F5 Enterprise Manager
F5 BIG-IQ Centralized Management
F5 iWorkflow
F5 Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: None
CVE Names: CVE-2019-11331
Original Bulletin:
https://support.f5.com/csp/article/K09940637
Revision History: August 17 2021: Vendor issues branch updates
January 28 2021: Initial Release
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K09940637: NTP vulnerability CVE-2019-11331
Original Publication Date: 24 Jul, 2019
Latest Publication Date: 17 Aug, 2021
Security Advisory Description
Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for
modes where a fixed port number is not required, which makes it easier for
remote attackers to conduct off-path attacks. (CVE-2019-11331)
Impact
Using an off-path attack (not a man-in-the-middle attack), a remote attacker
may more easily exploit unpatched NTP vulnerabilities, which could potentially
allow an an attacker to access resources, modify files, or cause a denial of
service (DoS) attack.
This vulnerability is inherent in RFC 5905, and thus F5 cannot affect a fix
without breaking compatibility. IETF has drafted a port randomization RFC for
future publication and adoption. For further information, refer see the
Supplemental Information section in this article.
Security Advisory Status
F5 Product Development has assigned ID 805961 (BIG-IP), ID 805385 (BIG-IQ), ID
805385-2 (F5 iWorkflow), ID 805385-3 (Enterprise Manager), and CPF-25117
(Traffix) 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, point 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 | |1 |or feature|
| | |vulnerable| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |16.0.0 - |None^2 | | | |
| | |16.1.0 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None^2 | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, APM, |14.x |14.1.0 - |None^2 | | | |
|ASM, DNS, Edge | |14.1.3 | | | | |
|Gateway, FPS, GTM, +------+----------+----------+High |8.1 |NTP |
|Link Controller, PEM,|13.x |13.1.0 - |None^2 | | | |
|WebAccelerator) | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None^2 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None^2 | | | |
| | |11.6.5 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|Enterprise Manager |3.x |3.1.1 |None^2 |High |8.1 |NTP |
+---------------------+------+----------+----------+--------+------+----------+
| |8.x |8.0.0 - |None^2 | | | |
| | |8.1.0 | | | | |
| +------+----------+----------+ | | |
| |7.x |7.0.0 - |None^2 | | | |
|BIG-IQ Centralized | |7.1.0 | | | | |
|Management +------+----------+----------+High |8.1 |NTP |
| |6.x |6.0.0 - |None^2 | | | |
| | |6.1.0 | | | | |
| +------+----------+----------+ | | |
| |5.x |5.1.0 - |None^2 | | | |
| | |5.4.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|F5 iWorkflow |2.x |2.3.0 |None^2 |High |8.1 |NTP |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |5.0.0 - |None^2 |High |8.1 |NTP |
| | |5.1.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
^2F5 will not address this vulnerability because doing so would violate RFC
5905 and break compatibility with the global NTP network.
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
None
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
Note: The following link take you to a resource outside of AskF5, and it is
possible that the documents may be removed without our knowledge.
o ITEF RFC Draft: Port Randomization in the Network Time Protocol Version 4
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