Several security issues were fixed in urllib3.
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)
21 May 2019
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in urllib3.
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)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.