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AUSCERT External Security Bulletin Redistribution
ESB-2018.2157.2
K45435121: DNS Express vulnerability CVE-2018-5538
14 August 2018
===========================================================================
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-2018-5538
Original Bulletin:
https://support.f5.com/csp/article/K45435121
Revision History: August 14 2018: Updated security advisory status table.
July 25 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K45435121:DNS Express vulnerability CVE-2018-5538
Security Advisory
Original Publication Date: 25 Jul, 2018
Latest Publication Date: 14 Aug, 2018
Security Advisory Description
DNS Express and DNS Zones accept NOTIFY messages on the management interface
from source IP addresses not listed in the 'Allow NOTIFY From' configuration
parameter when the "dnsexpress.notifyport" database variable is set to any
value other than the default of "0." (CVE-2018-5538)
Impact
This vulnerability may allow a malicious actor to cause DNS Express to
constantly check for updates. An update only occurs if the zone's serial
number has changed.
Security Advisory Status
F5 Product Development has assigned ID 698813 (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 | |1 |or feature|
| | |vulnerable| | | | |
+------------------+------+----------+----------+----------+------+----------+
| |14.x |None |14.0.0 | | | |
| +------+----------+----------+ | | |
|BIG-IP (DNS, |13.x |13.1.0 |13.1.0.8 | | | |
|GTM, LTM, Link +------+----------+----------+Medium |6.5 |DNS |
|Controller) |12.x |12.1.3 |12.1.3.6 | | |Express |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+----------+
| |14.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IP (AAM, AFM, |13.x |None |Not | | | |
|Analytics, APM, | | |applicable|Not | | |
|ASM, Edge Gateway,+------+----------+----------+vulnerable|None |None |
|FPS, PEM, |12.x |None |Not | | | |
|WebAccelerator) | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+----------+
|ARX |6.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager|3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------------+------+----------+----------+----------+------+----------+
| |6.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized|5.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+----------+
|BIG-IQ Cloud and |1.x |None |Not |Not |None |None |
|Orchestration | | |applicable|vulnerable| | |
+------------------+------+----------+----------+----------+------+----------+
|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| | | |
+------------------+------+----------+----------+----------+------+----------+
^1 The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
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, you can set the dnsexpress.notifyport database
key to '0.' To do so, perform the following procedure:
Impact of action: On heavily loaded systems, DNS NOTIFY messages may be
delayed or lost.
1. Log in to the TMOS Shell (tmsh) as an administrative user by typing the
following command:
tmsh
2. Modify the database key using the following command:
modify /sys db dnsexpress.notifyport value 0
3. Save the change by typing the following command:
save /sys config
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 K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 13.x)
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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