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             AUSCERT External Security Bulletin Redistribution

                    Python vulnerability CVE-2019-9636
                              6 January 2021


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP products
                   F5 BIG-IQ Centralized Management
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-9636  

Reference:         ASB-2020.0026

Original Bulletin: 

Revision History:  January    6 2021: Additional vulnerable versions added by vendor 
                   September 17 2020: Initial Release

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K57542514: Python vulnerability CVE-2019-9636

Original Publication Date: 17 Sep, 2020
Latest   Publication Date: 06 Jan, 2021

Security Advisory Description

Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper
Handling of Unicode Encoding (with an incorrect netloc) during NFKC
normalization. The impact is: Information disclosure (credentials, cookies,
etc. that are cached against a given hostname). The components are:
urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially
crafted URL could be incorrectly parsed to locate cookies or authentication
data and send that information to a different host than when parsed correctly. 


A remote attacker may be able to use a specially crafted URL to locate cookies
or authentication data and send that information to a different host than when
parsed correctly.

BIG-IP Extended Application Verification (EAV) monitors using the Python
urlsplit() function with URLs from an untrusted source may be impacted by this

Security Advisory Status

F5 Product Development has assigned ID 945033 (BIG-IP) and (BIG-IQ) to this

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,    |      |14.1.3    |          |          |      |          |
|ASM, DDHD, DNS,    +------+----------+----------+Medium    |4.8   |Python    |
|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    |          |          |      |          |
|                   |7.x   |7.0.0 -   |None      |          |      |          |
|                   |      |7.1.0     |          |          |      |          |
|BIG-IQ Centralized +------+----------+----------+          |      |          |
|Management         |6.x   |6.0.0 -   |None      |Medium    |4.8   |Python    |
|                   |      |6.1.0     |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.x   |5.4.0     |None      |          |      |          |
|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.

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.


Do not use URLs from an untrusted source for custom EAV monitors that use the
Python urlsplit() function.

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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