{"id":"USN-4233-2","summary":"gnutls28 update","details":"USN-4233-1 disabled SHA1 being used for digital signature operations in\nGnuTLS. In certain network environments, certificates using SHA1 may still\nbe in use. This update adds the %VERIFY_ALLOW_BROKEN and\n%VERIFY_ALLOW_SIGN_WITH_SHA1 priority strings that can be used to\ntemporarily re-enable SHA1 until certificates can be replaced with a\nstronger algorithm.\n\nOriginal advisory details:\n\n As a security improvement, this update marks SHA1 as being untrusted for\n digital signature operations.\n","modified":"2026-04-22T09:51:07.827113Z","published":"2020-01-23T16:57:09Z","references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4233-2"},{"type":"REPORT","url":"https://launchpad.net/bugs/1860656"}],"affected":[{"package":{"name":"gnutls28","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/gnutls28@3.4.10-4ubuntu1.7?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.10-4ubuntu1.7"}]}],"versions":["3.3.15-5ubuntu2","3.3.18-1ubuntu1","3.3.20-1ubuntu1","3.4.9-2ubuntu1","3.4.10-4ubuntu1","3.4.10-4ubuntu1.1","3.4.10-4ubuntu1.2","3.4.10-4ubuntu1.3","3.4.10-4ubuntu1.4","3.4.10-4ubuntu1.5","3.4.10-4ubuntu1.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"gnutls-bin","binary_version":"3.4.10-4ubuntu1.7"},{"binary_name":"guile-gnutls","binary_version":"3.4.10-4ubuntu1.7"},{"binary_name":"libgnutls-openssl27","binary_version":"3.4.10-4ubuntu1.7"},{"binary_name":"libgnutls30","binary_version":"3.4.10-4ubuntu1.7"},{"binary_name":"libgnutlsxx28","binary_version":"3.4.10-4ubuntu1.7"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:16.04:LTS","cves":[]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4233-2.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/gnutls28@3.5.18-1ubuntu1.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.18-1ubuntu1.3"}]}],"versions":["3.5.8-6ubuntu3","3.5.17-1ubuntu1","3.5.17-1ubuntu3","3.5.18-1ubuntu1","3.5.18-1ubuntu1.1","3.5.18-1ubuntu1.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"gnutls-bin","binary_version":"3.5.18-1ubuntu1.3"},{"binary_name":"libgnutls-dane0","binary_version":"3.5.18-1ubuntu1.3"},{"binary_name":"libgnutls-openssl27","binary_version":"3.5.18-1ubuntu1.3"},{"binary_name":"libgnutls30","binary_version":"3.5.18-1ubuntu1.3"},{"binary_name":"libgnutlsxx28","binary_version":"3.5.18-1ubuntu1.3"}]},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4233-2.json"}}],"schema_version":"1.7.5"}