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AUSCERT External Security Bulletin Redistribution
ESB-2020.4482.2
BIG-IP Products - Configuration utility XSS vulnerability CVE-2020-27719
18 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27719
Original Bulletin:
https://support.f5.com/csp/article/K19166530
Revision History: January 18 2021: Vendor updated mitigation section
December 18 2020: Initial Release
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K19166530: XSS vulnerability CVE-2020-27719
Original Publication Date: 17 Dec, 2020
Latest Publication Date: 16 Jan, 2021
Security Advisory Description
A cross-site scripting (XSS) vulnerability exists in an undisclosed page of the
BIG-IP Configuration utility. (CVE-2020-27719)
Impact
An attacker can exploit this vulnerability to run JavaScript in the context of
the currently logged-in user. An administrative user with access to the
Advanced Shell (bash) who successfully exploits this vulnerability can
completely compromise the BIG-IP system through remote code execution.
Security Advisory Status
F5 Product Development has assigned ID 928321 (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, 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 or |
| | |be |in | |1 |feature |
| | |vulnerable| | | | |
+----------------+------+----------+----------+----------+------+-------------+
| |16.x |16.0.0 |16.0.1 | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.1 | | | |
| | |15.1.0 | | | | |
|BIG-IP (LTM, +------+----------+----------+ | | |
|AAM, Advanced |14.x |14.1.0 - |14.1.3.1 | | | |
|WAF, AFM, | |14.1.3 | | | | |
|Analytics, APM, +------+----------+----------+High |7.5 |Configuration|
|ASM, DDHD, DNS, |13.x |None |Not | | |utility |
|FPS, GTM, Link | | |applicable| | | |
|Controller, PEM,+------+----------+----------+ | | |
|SSLO) |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+----------------+------+----------+----------+----------+------+-------------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IQ +------+----------+----------+ | | |
|Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+----------------+------+----------+----------+----------+------+-------------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+----------------+------+----------+----------+----------+------+-------------+
^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.
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 should permit management access to F5
products only over a secure network, and limit access to only trusted users.
For more information about securing access to BIG-IP systems, refer to K13092:
Overview of securing access to the BIG-IP system.
The trusted users with access to the Configuration utility should take
precaution when selecting hyperlinks from untrusted or unknown sources. The
attack for this vulnerability is most likely to happen in the form of a
phishing attack.
Acknowledgements
F5 acknowledges Kevin Breen for bringing this issue to our
attention and following the highest standards of coordinated disclosure.
Supplemental Information
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 - 16.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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