========================================================================== 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 Summary: Several security issues were fixed in curl. Software Description: - curl: HTTP, HTTPS, and FTP client and client libraries Details: 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: https://ubuntu.com/security/notices/USN-5079-1 CVE-2021-22945, CVE-2021-22946, CVE-2021-22947 Package Information: https://launchpad.net/ubuntu/+source/curl/7.74.0-1ubuntu2.3 https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.7 https://launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.15