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AUSCERT External Security Bulletin Redistribution
ESB-2019.4765.2
SCP vulnerability CVE-2019-6679
11 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Overwrite Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6679
Original Bulletin:
https://support.f5.com/csp/article/K54336216
Revision History: February 11 2020: Updated Security Advisory Status table
December 23 2019: Initial Release
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K54336216:SCP vulnerability CVE-2019-6679
Security Advisory
Original Publication Date: 20 Dec, 2019
Latest Publication Date: 10 Feb, 2020
Security Advisory Description
The system does not properly enforce the access controls for the scp.whitelist
and scp.blacklist files when paths are symbolic links (symlinks). This allows
authenticated users with Secure Copy (SCP) protocol access to overwrite certain
configuration files that would otherwise be restricted. (CVE-2019-6679)
Impact
BIG-IP
Authenticated users with access to the Secure Copy utility (scp), which is an
OpenSSH tool, but without full file system-or Advanced Shell (bash)-access, can
overwrite certain configuration files.
BIG-IQ / Enterprise Manager / Traffix SDC
There is no impact; these F5 products are not affected by this vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 789893 (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 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |15.1.0 | | | |
| | |15.0.1 |15.0.1.1 | | | |
| +------+----------+----------+ | | |
| | |14.1.0.2 -| | | | |
| |14.x |14.1.2 |14.1.2.3 | | | |
|BIG-IP (LTM, AAM, | |14.0.0.5 -|14.0.1.1 | | | |
|AFM, Analytics, | |14.0.1 | | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | |SCP (a |
|Gateway, FPS, GTM, |13.x |13.1.1.5 -|13.1.3.2 |Low |3.3 |component |
|Link Controller, | |13.1.3 | | | |of |
|PEM, +------+----------+----------+ | |OpenSSH) |
|WebAccelerator) |12.x |12.1.4.1 -|12.1.5.1 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| | |11.6.4 - | | | | |
| |11.x |11.6.5 |11.6.5.1 | | | |
| | |11.5.9 - | | | | |
| | |11.5.10 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |None |Not | | | |
|BIG-IQ Centralized | | |applicable|Not | | |
|Management +------+----------+----------+vulnerable|None |None |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|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.
F5 will not develop a fix for vulnerable products that do not already have a
fixed version listed in this article, and will not update this table with
subsequent vulnerable releases in the associated branches. F5 recommends that
you update to more recent, non-vulnerable versions whenever feasible. For more
information, refer to K4602: Overview of the F5 security vulnerability response
policy.
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Fixes introduced in column. If the table lists only an older version
than what you are currently running, or does not list a non-vulnerable version,
then no upgrade candidate currently exists.
Mitigation
Limit access to the scp utility to trusted administrative users on the BIG-IP
system.
Supplemental Information
o K51812227: Understanding Security Advisory versioning
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 - 15.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
o K13092: Overview of securing access to the BIG-IP system
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