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AUSCERT External Security Bulletin Redistribution
ESB-2022.2376
K67090077: Apache HTTP Server vulnerability CVE-2022-22720
16 May 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP (all modules)
BIG-IQ Centralized Management
F5OS-A
F5OS-C
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2022-22720
Original Bulletin:
https://support.f5.com/csp/article/K67090077
Comment: CVSS (Max): 7.1 CVE-2022-22720 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L)
CVSS Source: F5 Networks
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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K67090077: Apache HTTP Server vulnerability CVE-2022-22720
Original Publication Date: 14 May, 2022
Security Advisory Description
Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when
errors are encountered discarding the request body, exposing the server to HTTP
Request Smuggling. (CVE-2022-22720)
Impact
Any authenticated user may exploit this vulnerability and cause a breach in
data confidentiality, integrity, and availability.
Note: Only authenticated users, with any privilege level, can exploit this
vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 1088445 (BIG-IP), ID 1088445-10
(BIG-IQ), ID 2064321 (Traffix) and ID 1093105 (F5OS) to this vulnerability.
This issue has been classified as CWE-444: Inconsistent Interpretation of HTTP
Requests ('HTTP Request Smuggling')
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 |
+-------------+------+--------------+----------+--------+------+--------------+
| |17.x |17.0.0 |None | | | |
| +------+--------------+----------+ | | |
| |16.x |16.1.0 - |None | | | |
| | |16.1.2 | | | | |
| +------+--------------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.5 | | | | |
| +------+--------------+----------+ | | |
|BIG-IP (all |14.x |14.1.0 - |None | | | |
|modules) | |14.1.4 | |Medium |6.3 |Apache httpd |
| +------+--------------+----------+ | | |
| |13.x |13.1.0 - |None | | | |
| | |13.1.5 | | | | |
| +------+--------------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.6 | | | | |
| +------+--------------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------+------+--------------+----------+--------+------+--------------+
|BIG-IQ |8.x |8.0.0 - 8.2.0 |None | | | |
|Centralized +------+--------------+----------+Medium |6.3 |Apache httpd |
|Management |7.x |7.0.0 - 7.1.0 |None | | | |
+-------------+------+--------------+----------+--------+------+--------------+
|F5OS-A |1.x |1.0.0 - 1.0.1 |None |High |7.1 |Apache httpd |
+-------------+------+--------------+----------+--------+------+--------------+
| | |1.3.0 - 1.3.1 | | | | |
|F5OS-C |1.x |1.2.0 - 1.2.2 |None |High |7.1 |Apache httpd |
| | |1.1.0 - 1.1.4 | | | | |
+-------------+------+--------------+----------+--------+------+--------------+
|Traffix SDC |5.x |5.2.0 |None |High |7.1 |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
Until it is possible to install a fixed version, you can use the following
sections as temporary mitigations. These mitigations restrict access to the
Configuration utility to only trusted networks or devices, thereby limiting the
attack surface.
o Block Configuration utility access through self IP addresses
o Block Configuration utility access through the management interface
Block Configuration utility access through self IP addresses
You can block all access to the Configuration utility of your BIG-IP system
using self IP addresses. To do so, you can change the Port Lockdown setting
to Allow None for each self IP address on the system. If you must open any
ports, you should use the Allow Custom option, taking care to block access to
the Configuration utility. By default, the Configuration utility listens on TCP
port 443. If you modified the default port, ensure that you block access to the
alternate port you configured.
Note: Performing this action prevents all access to the Configuration utility
and iControl REST using the self IP address. These changes may also impact
other services, including breaking high availability (HA) configurations.
Before you make changes to the configuration of your self IP addresses, F5
strongly recommends that you refer to the following articles:
o K17333: Overview of port lockdown behavior (12.x - 16.x)
o K13092: Overview of securing access to the BIG-IP system
o K31003634: The Configuration utility of the Single-NIC BIG-IP Virtual
Edition now defaults to TCP port 8443
o K51358480: The single-NIC BIG-IP VE may erroneously revert to the default
management httpd port after a configuration reload
If you must expose port 443 on your self IP addresses and want to restrict
access to specific IP ranges, you may consider using the packet filtering
functionality built into the BIG-IP system. For more information, refer to the
following article:
o K13383: Configuring CIDR Network Addresses for the BIG-IP packet filter
Block Configuration utility access through the management interface
To mitigate this vulnerability for affected F5 products, you should restrict
management access to F5 products 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 K13309: Restricting access to the Configuration utility by source IP
address (11.x - 16.x)
o K13092: Overview of securing access to the BIG-IP system
o K46122561: Restricting access to the management interface using network
firewall rules
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 - 17.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
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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Australian Computer Emergency Response Team
The University of Queensland
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Qld 4072
Internet Email: auscert@auscert.org.au
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