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AUSCERT External Security Bulletin Redistribution
ESB-2020.2934
iControl REST CSRF vulnerability CVE-2020-5922
26 August 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Cross-site Request Forgery -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5922
Original Bulletin:
https://support.f5.com/csp/article/K20606443
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K20606443: iControl REST CSRF vulnerability CVE-2020-5922
Security Advisory
Original Publication Date: 26 Aug, 2020
Security Advisory Description
iControl REST does not implement cross-site request forgery (CSRF) protections
for users applying basic authentication in a web browser. (CVE-2020-5922)
Impact
In a successful exploit, an attacker can run JavaScript in the context of the
currently logged-in user. For an administrative user with access to the
Advanced Shell (bash), successful exploitation of this vulnerability can be
leveraged to compromise the BIG-IP system through remote code execution.
The attack conditions require a valid user to first authenticate to the
iControl REST API using Basic Auth credentials in their browser, which is an
uncommon use case and not recommended. Standard Configuration utility use of
iControl REST and manually browsing REST through /mgmt/toc does not expose this
issue, as these mechanisms use token-based authentication with custom HTTP
headers.
Security Advisory Status
F5 Product Development has assigned ID 841577 (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 |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |16.0.0 | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.0.5 | | | |
| | |15.1.0 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |14.1.0 - |14.1.2.7 | | | |
|Analytics, APM, | |14.1.2 | | | | |
|ASM, DDHD, DNS, +------+----------+----------+High |7.5 |iControl |
|FPS, GTM, Link |13.x |13.1.0 - |13.1.3.4 | | |REST |
|Controller, PEM, | |13.1.3 | | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.2 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |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 eliminate this vulnerability, you can avoid using iControl REST with basic
authentication through a web browser. F5 does not recommend this method.
If you must use basic authentication in the browser with iControl REST, you can
mitigate this vulnerability by performing the following actions:
o When finished, log off immediately by closing all instances of the web
browser to which you applied iControl REST with basic authentication.
o Do not allow the web browser to save usernames and passwords, and do not
allow sites to remember the log-in details for iControl REST.
o Do not use the same web browser that you used iControl REST with basic
authentication for any other purposes, such as surfing the Internet. If it
is necessary to perform both actions on the same client machine, do so in
separate browsers.
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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