[USN-5079-1] curl vulnerabilities

========================================================================== Ubuntu Security Notice USN-5079-1 September 15, 2021
curl vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.04 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Several security issues were fixed in curl.
Software Description: – curl: HTTP, HTTPS, and FTP client and client libraries
It was discovered that curl incorrect handled memory when sending data to an MQTT server. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-22945)
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 21.04: curl 7.74.0-1ubuntu2.3 libcurl3-gnutls 7.74.0-1ubuntu2.3 libcurl3-nss 7.74.0-1ubuntu2.3 libcurl4 7.74.0-1ubuntu2.3
Ubuntu 20.04 LTS: curl 7.68.0-1ubuntu2.7 libcurl3-gnutls 7.68.0-1ubuntu2.7 libcurl3-nss 7.68.0-1ubuntu2.7 libcurl4 7.68.0-1ubuntu2.7
Ubuntu 18.04 LTS: curl 7.58.0-2ubuntu3.15 libcurl3-gnutls 7.58.0-2ubuntu3.15 libcurl3-nss 7.58.0-2ubuntu3.15 libcurl4 7.58.0-2ubuntu3.15
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5079-1 CVE-2021-22945, CVE-2021-22946, CVE-2021-22947
Package Information: launchpad.net/ubuntu/+source/curl/7.74.0-1ubuntu2.3 launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.7 launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.15