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AUSCERT External Security Bulletin Redistribution
ESB-2021.0819.2
Linux kernel vulnerability CVE-2019-18282
14 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
BIG-IQ
F5OS
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-18282
Reference: ESB-2020.4406
ESB-2020.2309
ESB-2020.0766
Original Bulletin:
https://support.f5.com/csp/article/K32380005
Revision History: September 14 2021: Vendor updated versions known to be vulnerable
March 9 2021: Initial Release
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K32380005: Linux kernel vulnerability CVE-2019-18282
Original Publication Date: 09 Mar, 2021
Latest Publication Date: 13 Sep, 2021
Security Advisory Description
The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10
has a device tracking vulnerability, aka CID-55667441c84f. This occurs because
the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a
secret, and because jhash (instead of siphash) is used. The hashrnd value
remains the same starting from boot time, and can be inferred by an attacker.
This affects net/core/flow_dissector.c and related code. (CVE-2019-18282)
Impact
An attacker can exploit this vulnerability and access sensitive information on
an affected system.
Security Advisory Status
F5 Product Development has assigned ID 993681 (BIG-IP and BIG-IQ) and ID 989189
(F5OS) 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 |
| | |be |in | |1 |or feature|
| | |vulnerable| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |16.0.0 - |None | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |14.1.0 - |None | | | |
|Analytics, APM, | |14.1.4 | | | |Linux |
|ASM, DDHD, DNS, +------+----------+----------+Medium |5.3 |kernel |
|FPS, GTM, Link |13.x |13.1.0 - |None | | | |
|Controller, PEM, | |13.1.3 | | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |8.x |8.0.0 |None | | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |7.x |None |Not | | |Linux |
|Management | | |applicable|Medium |5.3 |kernel |
| +------+----------+----------+ | | |
| |6.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5OS |1.x |1.0.0 - |None |Medium |5.3 |Linux |
| | |1.1.4 | | | |kernel |
+-------------------+------+----------+----------+----------+------+----------+
|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.
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
There is no mitigation for this vulnerability. To reduce the risk of exploiting
this vulnerability, you should permit management access to F5 products only
over a secure network and limit access to only trusted users. For more
information about securing access to BIG-IP systems, refer to K13092: Overview
of securing access to the BIG-IP 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 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 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
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