==========================================================================
Ubuntu Security Notice USN-3990-1
May 21, 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

Summary:

Several security issues were fixed in urllib3.

Software Description:
- python-urllib3: HTTP library with thread-safe connection pooling for Python

Details:

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
expectations. 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

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

References:
  https://usn.ubuntu.com/usn/usn-3990-1
  CVE-2018-20060, CVE-2019-11236, CVE-2019-11324

Package Information:
  https://launchpad.net/ubuntu/+source/python-urllib3/1.24.1-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/python-urllib3/1.22-1ubuntu0.18.10.1
  https://launchpad.net/ubuntu/+source/python-urllib3/1.22-1ubuntu0.18.04.1
  https://launchpad.net/ubuntu/+source/python-urllib3/1.13.1-2ubuntu0.16.04.3