[USN-5079-2] curl vulnerabilities

========================================================================== Ubuntu Security Notice USN-5079-2 September 15, 2021
curl vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 16.04 ESM – Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in curl.
Software Description: – curl: HTTP, HTTPS, and FTP client and client libraries
Details:
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)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 ESM: curl 7.47.0-1ubuntu2.19+esm1 libcurl3 7.47.0-1ubuntu2.19+esm1 libcurl3-gnutls 7.47.0-1ubuntu2.19+esm1 libcurl3-nss 7.47.0-1ubuntu2.19+esm1
Ubuntu 14.04 ESM: curl 7.35.0-1ubuntu2.20+esm8 libcurl3 7.35.0-1ubuntu2.20+esm8 libcurl3-gnutls 7.35.0-1ubuntu2.20+esm8 libcurl3-nss 7.35.0-1ubuntu2.20+esm8
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5079-2 ubuntu.com/security/notices/USN-5079-1 CVE-2021-22946, CVE-2021-22947