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AUSCERT External Security Bulletin Redistribution
ESB-2021.3405
Apache HTTPD vulnerability CVE-2021-34798
14 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
F5OS
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2021-34798
Reference: ESB-2021.3387
ESB-2021.3357
ESB-2021.3250
ESB-2021.3239
Original Bulletin:
https://support.f5.com/csp/article/K72382141
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K72382141: Apache HTTPD vulnerability CVE-2021-34798
Original Publication Date: 13 Oct, 2021
Security Advisory Description
Malformed requests may cause the server to dereference a NULL pointer. This
issue affects Apache HTTP Server 2.4.48 and earlier. (CVE-2021-34798)
Impact
A NULL pointer dereference in httpd allows an unauthenticated remote attacker
to cause httpd to terminate by providing malformed HTTP requests. The highest
threat from this vulnerability is to system availability.
Security Advisory Status
F5 Product Development has assigned ID 1051305 (BIG-IP), 1052821 (F5OS) and ID
SDC-1410, SDC-1415 (Traffix SDC) 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 Applies to (see versions) box of this
article 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 |16.1.0 |None | | | |
| +------+--------------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.4 | | | | |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |None | | | |
| | |14.1.4 | | | | |
|BIG-IP (all +------+--------------+----------+High |7.5 |Apache HTTPD |
|modules) |13.x |13.1.0 - |None | | | |
| | |13.1.4 | | | | |
| +------+--------------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.6 | | | | |
| +------+--------------+----------+ | | |
| |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 |1.2.0 - 1.2.1 |None |High |7.5 |Apache HTTPD |
| | |1.1.0 - 1.1.4 | | | | |
+------------+------+--------------+----------+----------+------+-------------+
|Traffix SDC |5.x |5.2.0 |None |High |7.5 |Apache HTTPD |
| | |5.1.0 | | | | |
+------------+------+--------------+----------+----------+------+-------------+
^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
To mitigate this vulnerability, you can restrict access to the Configuration
utility to only trusted users and devices over a secure network. For more
information about securing access to BIG-IP systems, refer to the following
articles:
o K13092: Overview of securing access to the BIG-IP system
o K69354049: Restricting access to the BIG-IP management interface for
Configuration Utility and iControl REST services using iptables
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 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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