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AUSCERT External Security Bulletin Redistribution
ESB-2020.4520
Apache Struts vulnerability CVE-2020-17530
22 December 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-17530
Reference: ESB-2020.4325
Original Bulletin:
https://support.f5.com/csp/article/K24608264
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K24608264: Apache Struts vulnerability CVE-2020-17530
Original Publication Date: 22 Dec, 2020
Security Advisory Description
Forced OGNL evaluation, when evaluated on raw user input in tag attributes, may
lead to remote code execution. Affected software : Apache Struts 2.0.0 - Struts
2.5.25. (CVE-2020-17530)
Impact
Using a forced Object-Graph Navigation Language (OGNL) evaluation on untrusted
user input allows an attacker to perform remote code execution leading to
security degradation.
Security Advisory Status
F5 Product Development has assigned ID 972613 (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| | | | |
+-----------------+------+----------+----------+----------+------+------------+
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |None | | | |
| | |14.1.3 | | | | |
| +------+----------+----------+ | |Web |
|BIG-IP (AAM) |13.x |13.1.0 - |None |Medium |4.6 |Acceleration|
| | |13.1.3 | | | |User |
| +------+----------+----------+ | |Interface |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-----------------+------+----------+----------+----------+------+------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, +------+----------+----------+ | | |
|Advanced WAF, |14.x |None |Not | | | |
|AFM, Analytics, | | |applicable|Not | | |
|APM, ASM, DDHD, +------+----------+----------+vulnerable|None |None |
|DNS, FPS, GTM, |13.x |None |Not | | | |
|Link Controller, | | |applicable| | | |
|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
You can eliminate this vulnerability by de-provisioning the BIG-IP AAM module.
Alternatively, if de-provisioning the BIG-IP AAM module is not possible, you
can eliminate this vulnerability by performing the following procedure:
1. Log in to the BIG-IP command line.
2. Use a text editor to add the following string to the /usr/local/www/waui/
WEB-INF/struts.xml file:
<constant name="struts.excludedPackageNames" value=
"java.io.,java.nio.,org.apache.tomcat." />
3. Save the changes and exit the file.
4. Restart the tomcat service by entering the following command:
tmsh restart sys service tomcat
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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