USN-5079-2: curl vulnerabilities

USN-5079-2: curl vulnerabilities

USN-5079-1 fixed several vulnerabilities in curl. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Patrick Monnerat discovered that curl incorrectly handled upgrades to TLS.
When receiving certain responses from servers, curl would continue without
TLS even when the option to require a successful upgrade to TLS was
specified. (CVE-2021-22946)

Patrick Monnerat discovered that curl incorrectly handled responses
received before STARTTLS. A remote attacker could possibly use this issue
to inject responses and intercept communications. (CVE-2021-22947)
Source: USN-5079-2: curl vulnerabilities