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AUSCERT External Security Bulletin Redistribution
ESB-2020.1550.2
BIG-IP APM Edge Client vulnerability CVE-2020-5893
2 July 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP APM Edge Client
Publisher: F5 Networks
Operating System: Network Appliance
Windows
Mac OS
Linux variants
Impact/Access: Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-5893
Original Bulletin:
https://support.f5.com/csp/article/K97733133
Revision History: July 2 2020: Vendor released minor update
April 30 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K97733133:BIG-IP APM Edge Client vulnerability CVE-2020-5893
Security Advisory
Original Publication Date: 30 Apr, 2020
Latest Publication Date: 02 Jul, 2020
Security Advisory Description
When a user connects to a VPN using BIG-IP Edge Client over an unsecure
network, BIG-IP Edge Client responds to authentication requests over HTTP while
sending probes for captive portal detection. (CVE-2020-5893)
Impact
An attacker can use a man-in-the-middle (MITM) attack by deploying a
malicious captive portal to exploit this vulnerability to obtain the
encrypted NT Lan Manager (NTLM) challenge response. This can be used to carry
out brute force dictionary attacks or NTLM relay attacks if the attacker has
access to the Active Directory network.
Security Advisory Status
F5 Product Development has assigned ID 838909 (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, 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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| | | | | | |BIG-IP |
| | |7.1.5 - | | | |Edge |
|APM Clients |7.1.x |7.1.8 |7.1.9 |Low |3.7 |Client |
| | | | | | |captive |
| | | | | | |portal |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |None | | | |
| | |15.1.0^2 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.0.0 - |None | | | |
| | |14.1.2^2 | | | |BIG-IP |
| +------+----------+----------+ | |Edge |
|BIG-IP (APM) |13.x |13.1.0 - |None |Low |3.7 |Client |
| | |13.1.3^2 | | | |captive |
| +------+----------+----------+ | |portal |
| |12.x |12.1.0 - |12.1.5.2 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (LTM, AAM, | | |applicable| | | |
|AFM, Analytics, +------+----------+----------+ | | |
|ASM, DNS, FPS, GTM,|13.x |None |Not |Not |None |None |
|Link Controller, | | |applicable|vulnerable| | |
|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| | |
+-------------------+------+----------+----------+----------+------+----------+
^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.
^2In BIG-IP 13.1.0 and later, you can update APM client components
independently from BIG-IP software. To address this vulnerability, customers
running BIG-IP 13.1.0 and later can download and install an APM Clients version
listed in the Fixed introduced in column, and then redeploy the BIG-IP Edge
Client to end users.
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 disable captive portal detection. For
more information, refer to K14766: Disabling BIG-IP Edge Client captive portal
detection.
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
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