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             AUSCERT External Security Bulletin Redistribution

                     SCP vulnerability CVE-2020-15778
                              6 January 2021


        AusCERT Security Bulletin Summary

Product:           BIG-IP
                   BIG-IQ Centralized Management
                   Traffix SDC
Publisher:         F5 Networks
Operating System:  Network Appliance
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-15778  

Original Bulletin: 

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than F5 Networks. It is recommended that 
         administrators running OpenSSH check for an updated version of the software for their 
         operating system.

Revision History:  January    6 2021: Additional vulnerable versions added by vendor 
                   September 24 2020: Initial Release

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K04305530: SCP vulnerability CVE-2020-15778

Original Publication Date: 24 Sep, 2020
Latest   Publication Date: 06 Jan, 2021

Security Advisory Description

scp in OpenSSH through 8.3p1 allows command injection in scp.c remote function,
as demonstrated by backtick characters in the destination argument. NOTE: the
vendor reportedly has stated that they intentionally omit validation of
"anomalous argument transfers" because that could "stand a great chance of
breaking existing workflows." (CVE-2020-15778)


This flaw is found in the SCP program shipped with the openssh-clients package.
An attacker having the ability to SCP files to a remote server could run
arbitrary commands on the remote server by including a command as a part of the
filename being copied on the server. This command runs with the user
permissions used to copy the files on the remote server. The most serious
threats from this vulnerability are to data confidentiality and integrity, as
well as to system availability.

Security Advisory Status

F5 Product Development has assigned ID 937433 (BIG-IP), ID 937037 (BIG-IQ)
and CPF-25210 (Traffix) 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      |        |      |SCP (a    |
|Analytics, APM, ASM, |      |14.1.3    |          |        |      |component |
|DDHD, DNS, FPS, GTM, +------+----------+----------+High    |7.8   |of        |
|Link Controller, PEM,|13.x  |13.1.0 -  |None      |        |      |OpenSSH)  |
|SSLO)                |      |13.1.3    |          |        |      |          |
|                     +------+----------+----------+        |      |          |
|                     |12.x  |12.1.0 -  |None      |        |      |          |
|                     |      |12.1.5    |          |        |      |          |
|                     +------+----------+----------+        |      |          |
|                     |11.x  |11.6.1 -  |None      |        |      |          |
|                     |      |11.6.5    |          |        |      |          |
|                     |7.x   |7.0.0 -   |None      |        |      |          |
|                     |      |7.1.0     |          |        |      |SCP (a    |
|BIG-IQ Centralized   +------+----------+----------+        |      |component |
|Management           |6.x   |6.0.0 -   |None      |High    |7.8   |of        |
|                     |      |6.1.0     |          |        |      |OpenSSH)  |
|                     +------+----------+----------+        |      |          |
|                     |5.x   |5.4.0     |None      |        |      |          |
|                     |      |          |          |        |      |SCP (a    |
|Traffix SDC          |5.x   |5.1.0     |None      |High    |7.8   |component |
|                     |      |          |          |        |      |of        |
|                     |      |          |          |        |      |OpenSSH)  |

^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.


To mitigate this vulnerability, you can restrict SCP access to the BIG-IP
Configuration utility (Traffic Management User Interface/TMUI) to only trusted
administrators through local or network firewalls and block SCP access by
changing the Port Lockdown setting to Allow None for each self IP in the
system. If you must open any ports, you should use the Allow Custom option,
taking care to disallow SSH access. For more information, refer to the
following articles:

  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 K17333: Overview of port lockdown behavior (12.x - 16.x)

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 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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