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AUSCERT External Security Bulletin Redistribution
ESB-2021.2360
glibc vulnerability CVE-2020-27618
13 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP (all modules)
BIG-IQ Centralized Management
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2020-27618
Reference: ESB-2021.1743
ESB-2021.1236
Original Bulletin:
https://support.f5.com/csp/article/K08641512
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K08641512: glibc vulnerability CVE-2020-27618
Original Publication Date: 13 Jul, 2021
Security Advisory Description
The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier,
when processing invalid multi-byte input sequences in IBM1364, IBM1371,
IBM1388, IBM1390, and IBM1399 encodings, fails to advance the input state,
which could lead to an infinite loop in applications, resulting in a denial of
service, a different vulnerability from CVE-2016-10228. (CVE-2020-27618)
Impact
When the infinite loop can be influenced by an attacker, this weakness could
allow attackers to consume excessive resources such as CPU or memory resulting
in a denial of service (DoS).
Security Advisory Status
F5 Product Development has assigned ID 1026873 (BIG-IP), ID 1029705 (BIG-IQ),
and SDC-1215 and SDC-1217 (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 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 |16.0.0 - |None | | | |
| | |16.1.0 | | | | |
| +------+--------------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.3 | | | | |
| +------+--------------+----------+ | | |
| |14.x |14.1.0 - |None | | | |
|BIG-IP (all | |14.1.4 | | | | |
|modules) +------+--------------+----------+Medium |4.4 |glibc |
| |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 | | | |
+------------+------+--------------+----------+----------+------+-------------+
| |8.x |8.0.0 - 8.1.0 |None | | | |
|BIG-IQ +------+--------------+----------+ | | |
|Centralized |7.x |7.0.0 - 7.1.0 |None |Medium |4.4 |glibc |
|Management +------+--------------+----------+ | | |
| |6.x |6.0.1 - 6.1.0 |None | | | |
+------------+------+--------------+----------+----------+------+-------------+
|F5OS |1.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+------------+------+--------------+----------+----------+------+-------------+
|Traffix SDC |5.x |5.1.0 |None |Medium |5.5 |glibc |
+------------+------+--------------+----------+----------+------+-------------+
^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 for affected F5 products, you should permit
management access to F5 products only over a secure network and limit shell
access to only trusted users. For more information about securing access to
BIG-IP and BIG-IQ systems, refer to the following:
o K13092: Overview of securing access to the BIG-IP system
o K13309: Restricting access to the Configuration utility by source IP
address (11.x - 16.x)
o K31401771: Restricting access to the BIG-IQ or F5 iWorkflow user interface
by source IP address
o K39403510: Managing the port lockdown configuration on the BIG-IQ system
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 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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