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AUSCERT External Security Bulletin Redistribution
ESB-2021.2869
BIG-IP APM vulnerabilities
25 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP APM
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23052 CVE-2021-23047
Original Bulletin:
https://support.f5.com/csp/article/K79428827
https://support.f5.com/csp/article/K32734107
Comment: This bulletin contains two (2) F5 Networks security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
K79428827: BIG-IP APM OCSP vulnerability CVE-2021-23047
Original Publication Date: 24 Aug, 2021
Security Advisory Description
When BIG-IP APM performs Online Certificate Status Protocol (OCSP) verification
of a certificate that contains Authority Information Access (AIA), undisclosed
requests may cause an increase in memory use. (CVE-2021-23047)
Impact
This vulnerability allows a remote attacker to cause a degradation of service
that may cause a denial-of-service (DoS) on the BIG-IP system and send OCSP AIA
requests to the wrong server.
Security Advisory Status
F5 Product Development has assigned ID 962069 (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.
Note: After a fix is introduced for a given minor branch, that fix applies to
all subsequent maintenance and point releases for that branch, and no
additional fixes for that branch will be listed in the table. For example, when
a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all
later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to
K51812227: Understanding security advisory versioning. Additionally, software
versions preceding those listed in the following table have reached the End of
Technical Support (EoTS) phase of their lifecycle and are no longer evaluated
for security issues. For more information, refer to the Security hotfixes
section of K4602: Overview of the F5 security vulnerability response policy.
+------------+------+-------------+----------+----------+------+--------------+
| | |Versions |Fixes | |CVSSv3|Vulnerable |
|Product |Branch|known to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+------------+------+-------------+----------+----------+------+--------------+
| | |None |16.1.0 | | | |
| |16.x +-------------+----------+ | | |
| | |16.0.0 - |Will not | | | |
| | |16.0.1 |fix | | | |
| +------+-------------+----------+ | | |
| |15.x |15.1.0 - |15.1.3.1 | | | |
| | |15.1.3 | | | | |
| +------+-------------+----------+ | | |
| |14.x |14.1.0 - |14.1.4.3 | | |OCSP |
|BIG-IP APM | |14.1.4 | |Medium |5.3 |authentication|
| +------+-------------+----------+ | |module |
| |13.x |13.1.0 - |None | | | |
| | |13.1.4 | | | | |
| +------+-------------+----------+ | | |
| |12.x |12.1.0 - |Will not | | | |
| | |12.1.6 |fix | | | |
| +------+-------------+----------+ | | |
| |11.x |11.6.1 - |Will not | | | |
| | |11.6.5 |fix | | | |
+------------+------+-------------+----------+----------+------+--------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+-------------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+-------------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (all | | |applicable|Not | | |
|modules) +------+-------------+----------+vulnerable|None |None |
| |13.x |None |Not | | | |
| | | |applicable| | | |
| +------+-------------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+-------------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+-------------+----------+----------+------+--------------+
| |8.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IQ +------+-------------+----------+ | | |
|Centralized |7.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+-------------+----------+ | | |
| |6.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+-------------+----------+----------+------+--------------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+-------------+----------+----------+------+--------------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+-------------+----------+----------+------+--------------+
^1F5 only evaluates software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle.
^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by installing a version listed in
the Fixes introduced in column. If the Fixes introduced in column does not list
a version for your branch, then no update candidate currently exists for that
branch and F5 recommends upgrading to a version with the fix (refer to the
table).
If the Fixes introduced in column lists a version prior to the one you are
running, in the same branch, then your version should have the fix.
Mitigation
To mitigate this vulnerability, you can enable the Ignore AIA setting in the
OCSP Responder settings. To do so, perform the following procedure:
Impact of action: Enabling the Ignore AIA setting instructs the BIG-IP APM
system to ignore the URL contained in the certificate's AIA fields, and instead
always use the URL that the responder specifies.
1. Log in to the BIG-IP Configuration utility.
2. Go to Access > Authentication > OSCP Responder (13.x and later) or Access
Policy > AAA Servers > OCSP Responder (11.x - 12.x).
3. Select the name of the OCSP Responder configuration to edit.
4. Select Advanced.
5. For Options, select the Ignore AIA check box.
6. Select Update.
Acknowledgements
This issue was discovered internally by F5.
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 K8986: F5 software lifecycle policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
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
- --------------------------------------------------------------------------------
K32734107: BIG-IP APM vulnerability CVE-2021-23052
Original Publication Date: 24 Aug, 2021
Security Advisory Description
An open redirect vulnerability exists on virtual servers enabled with a BIG-IP
APM access policy. This vulnerability allows an unauthenticated malicious user
to build an open redirect URI. (CVE-2021-23052)
Impact
An unauthenticated attacker can create an open redirect URI with a specially
crafted value and trick BIG-IP APM users into visiting the crafted URI. Victims
may be redirected to a malicious website by following the misleading URI.
Security Advisory Status
F5 Product Development has assigned ID 1013145 (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.
Note: After a fix is introduced for a given minor branch, that fix applies to
all subsequent maintenance and point releases for that branch, and no
additional fixes for that branch will be listed in the table. For example, when
a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all
later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to
K51812227: Understanding security advisory versioning. Additionally, software
versions preceding those listed in the following table have reached the End of
Technical Support (EoTS) phase of their lifecycle and are no longer evaluated
for security issues. For more information, refer to the Security hotfixes
section of K4602: Overview of the F5 security vulnerability response policy.
+------------+------+--------------+----------+----------+------+-------------+
| | |Versions known|Fixes | |CVSSv3|Vulnerable |
|Product |Branch|to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+------------+------+--------------+----------+----------+------+-------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |14.1.4.4 | | | |
| | |14.1.4 | | | |BIG-IP APM |
|BIG-IP APM +------+--------------+----------+Medium |6.1 |access |
| |13.x |13.1.0 - |None | | |profile |
| | |13.1.4 | | | | |
| +------+--------------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+--------------+----------+----------+------+-------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (all | | |applicable|Not | | |
|other +------+--------------+----------+vulnerable|None |None |
|modules) |13.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+--------------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+--------------+----------+----------+------+-------------+
| |8.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IQ +------+--------------+----------+ | | |
|Centralized |7.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+--------------+----------+ | | |
| |6.x |None |Not | | | |
| | | |applicable| | | |
+------------+------+--------------+----------+----------+------+-------------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EoTS) phase of their lifecycle.
^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by installing a version listed in
the Fixes introduced in column. If the Fixes introduced in column does not list
a version for your branch, then no update candidate currently exists for that
branch and F5 recommends upgrading to a version with the fix (refer to the
table).
If the Fixes introduced in column lists a version prior to the one you are
running, in the same branch, then your version should have the fix.
Mitigation
None
Acknowledgements
F5 acknowledges Peter Lapp (lappsec) for bringing this issue to our attention
and for 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 K8986: F5 software lifecycle policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
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
- --------------------------END INCLUDED TEXT--------------------
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