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AUSCERT External Security Bulletin Redistribution
ESB-2020.3446
USN-4570-1: urllib3 vulnerability
6 October 2020
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AusCERT Security Bulletin Summary
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Product: urllib3
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-26137
Original Bulletin:
https://usn.ubuntu.com/4570-1/
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running urllib3 check for an updated version of the software for
their operating system.
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USN-4570-1: urllib3 vulnerability
05 October 2020
urllib3 could be used to perform a CRLF injection if it received a
specially crafted request.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o python-urllib3 - HTTP library with thread-safe connection pooling
Details
It was discovered that urllib3 incorrectly handled certain character
sequences. A remote attacker could possibly use this issue to perform CRLF
injection.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o python3-urllib3 - 1.25.8-2ubuntu0.1
Ubuntu 18.04
o python-urllib3 - 1.22-1ubuntu0.18.04.2
o python3-urllib3 - 1.22-1ubuntu0.18.04.2
Ubuntu 16.04
o python-urllib3 - 1.13.1-2ubuntu0.16.04.4
o python3-urllib3 - 1.13.1-2ubuntu0.16.04.4
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-26137
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