Ubuntu Security Notices
USN-4570-1

USN-4570-1: urllib3 vulnerability

Publication date

5 October 2020

Overview

urllib3 could be used to perform a CRLF injection if it received a specially crafted request.

Releases

20.04 LTS 18.04 LTS 16.04 LTS

Packages

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

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release	Package Version
20.04 focal	python3-urllib3 – 1.25.8-2ubuntu0.1
18.04 bionic	python-urllib3 – 1.22-1ubuntu0.18.04.2
18.04 bionic	python3-urllib3 – 1.22-1ubuntu0.18.04.2
16.04 xenial	python-urllib3 – 1.13.1-2ubuntu0.16.04.4
16.04 xenial	python3-urllib3 – 1.13.1-2ubuntu0.16.04.4

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References

CVE-2020-26137

CVE-2020-26137