USN-4898-1: curl vulnerabilities

Viktor Szakats discovered that curl did not strip off user credentials
from referrer header fields. A remote attacker could possibly use this
issue to obtain sensitive information. (CVE-2021-22876)

Mingtao Yang discovered that curl incorrectly handled session tickets when
using an HTTPS proxy. A remote attacker in control of an HTTPS proxy could
use this issue to bypass certificate checks and intercept communications.
This issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10.

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I'm a retired mathematician that has a fondness for Linux and many (not all) things tech. I'm an old-school geek that just enjoys the life he has. I live in a very, very rural area of Maine.

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