USN-3990-1: urllib3 vulnerabilities

21 May 2019

python-urllib3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.04
  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Several security issues were fixed in urllib3.

Software Description

  • python-urllib3 - HTTP library with thread-safe connection pooling for Python


It was discovered that urllib3 incorrectly removed Authorization HTTP headers when handled cross-origin redirects. This could result in credentials being sent to unintended hosts. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-20060)

It was discovered that urllib3 incorrectly stripped certain characters from requests. A remote attacker could use this issue to perform CRLF injection. (CVE-2019-11236)

It was discovered that urllib3 incorrectly handled situations where a desired set of CA certificates were specified. This could result in certificates being accepted by the default CA certificates contrary to expectatons. This issue only affected Ubuntu 18.04 LTS, Ubuntu 18.10, and Ubuntu 19.04. (CVE-2019-11324)

Update instructions

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

Ubuntu 19.04
python-urllib3 - 1.24.1-1ubuntu0.1
python3-urllib3 - 1.24.1-1ubuntu0.1
Ubuntu 18.10
python-urllib3 - 1.22-1ubuntu0.18.10.1
python3-urllib3 - 1.22-1ubuntu0.18.10.1
Ubuntu 18.04 LTS
python-urllib3 - 1.22-1ubuntu0.18.04.1
python3-urllib3 - 1.22-1ubuntu0.18.04.1
Ubuntu 16.04 LTS
python-urllib3 - 1.13.1-2ubuntu0.16.04.3
python3-urllib3 - 1.13.1-2ubuntu0.16.04.3

To update your system, please follow these instructions:

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