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AUSCERT External Security Bulletin Redistribution
ESB-2020.3176.2
Python vulnerability CVE-2019-9636
6 January 2021
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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
ESB-2020.2876
ESB-2020.2421
ESB-2020.0397
Original Bulletin:
https://support.f5.com/csp/article/K57542514
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.
(CVE-2019-9636)
Impact
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
vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 945033 (BIG-IP) and (BIG-IQ) 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 | | | |
|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.
Mitigation
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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