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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.1623
NGINX Controller webserver vulnerabilities
7 May 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: NGINX Controller webserver
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Unauthorised Access -- Remote with User Interaction
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5895 CVE-2020-5894
Original Bulletin:
https://support.f5.com/csp/article/K13028514
https://support.f5.com/csp/article/K95120415
Comment: This bulletin contains two (2) F5 Networks security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
K13028514:NGINX Controller webserver vulnerability CVE-2020-5894
Security Advisory
Original Publication Date: 07 May, 2020
Security Advisory Description
The NGINX Controller webserver does not invalidate the server-side session
token after users log out. (CVE-2020-5894)
Impact
An attacker that successfully extracted a valid session token can use it before
it expires on the server-side, even if the valid user has logged out by
clicking the Log Out button in the user interface or by sending a POST request
to https://<NGINX Controller FQDN>/api/v1/platform/logout.
Security Advisory Status
F5 Product Development has assigned ID IND-8576 (NGINX Controller) 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (LTM, AAM, | | |applicable| | | |
|AFM, Analytics, +------+----------+----------+ | | |
|APM, ASM, DNS, FPS,|13.x |None |Not |Not |None |None |
|GTM, Link | | |applicable|vulnerable| | |
|Controller, PEM) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |3.x |3.0.0 - |3.4.0 | | | |
| | |3.3.0 | | | |The NGINX |
| +------+----------+----------+ | |Controller|
|NGINX Controller |2.x |None |Not |Medium |5.4 |user |
| | | |applicable| | |interface |
| +------+----------+----------+ | |and API. |
| |1.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
^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.
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
To mitigate this vulnerability, you can invalidate all cookies and generate a
new random secret key. To do so, perform the following procedure:
Note: The following procedure is not intended to be a long-term solution. F5
recommends that you upgrade at the earliest possible opportunity.
Impact of action: This procedure must be repeated each time a user logs in to
the NGINX Controller system.
1. Log in to the command line of the NGINX Controller system.
2. Run the following commands to update the NGINX Controller credentials
configuration:
filter='.items | map(select(.metadata.name | startswith
("controller-secrets-"))) |
sort_by(.metadata.creationTimestamp) | last.metadata.name'
secret=$(kubectl -n nginx-controller get secret -o json | jq -r "$filter")
kubectl patch secret $secret --type='json' -p="$(jq -n --arg v $(openssl
rand -hex 16 | base64)
'[{op: "replace", path: "/data/flask", value: $v}]')"
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 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 K10640269: Setting nginx-controller as the default Kubernetes namespace
Note: The following links take you to a resource outside of AskF5, and the
third party could remove the documents without our knowledge:
o Kubernetes Secrets
o Update API Objects in Place Using kubectl patch
o Kubectl Reference Docs
- ------------------------------------------------------------------------------
K95120415:NGINX Controller AVRD vulnerability CVE-2020-5895
Security Advisory
Original Publication Date: 07 May, 2020
Security Advisory Description
AVRD uses world-readable and world-writable permissions on its socket, which
allows processes or users on the local system to write arbitrary data into the
socket. A local system attacker can make AVRD segmentation fault (SIGSEGV) by
writing malformed messages to the socket. (CVE-2020-5895)
Impact
The AVRD process is subject to denial of service (DoS) from a local system
attacker.
Security Advisory Status
F5 Product Development has assigned ID IND-9067 and IND-9068 (NGINX Controller)
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 or|
| | |be |in | |1 |feature |
| | |vulnerable| | | | |
+-----------------+------+----------+----------+----------+------+------------+
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (LTM, AAM,| | |applicable| | | |
|AFM, Analytics, +------+----------+----------+ | | |
|APM, ASM, DNS, |13.x |None |Not |Not |None |None |
|FPS, GTM, Link | | |applicable|vulnerable| | |
|Controller, PEM) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-----------------+------+----------+----------+----------+------+------------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IQ +------+----------+----------+ | | |
|Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-----------------+------+----------+----------+----------+------+------------+
|Traffix SDC |5.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-----------------+------+----------+----------+----------+------+------------+
| |3.x |3.1.0 - |3.4.0 | | |The |
| | |3.3.0 | | | |Analytics, |
| +------+----------+----------+ | |Visibility, |
|NGINX Controller |2.x |None |Not |Medium |6.6 |and |
| | | |applicable| | |Reporting |
| +------+----------+----------+ | |daemon |
| |1.x |None |Not | | |(AVRD). |
| | | |applicable| | | |
+-----------------+------+----------+----------+----------+------+------------+
^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.
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
To mitigate this vulnerability, you can deploy NGINX Controller on a secure
network and allow only trusted users to access the NGINX Controller command
line.
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 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 Supported Distributions for App-Centric Metrics
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