{"id":"UBUNTU-CVE-2023-0361","details":"A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large amount of specially crafted messages to the vulnerable server. By recovering the secret from the ClientKeyExchange message, the attacker would be able to decrypt the application data exchanged over that connection.","modified":"2026-07-14T23:30:12.735263429Z","published":"2023-02-15T18:15:00Z","related":["USN-5901-1"],"upstream":["CVE-2023-0361"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-0361"},{"type":"REPORT","url":"https://gnutls.org/security-new.html#GNUTLS-SA-2020-07-14"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5901-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-0361"}],"affected":[{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","3.4.10-4ubuntu1.7","3.4.10-4ubuntu1.8","3.4.10-4ubuntu1.9","3.4.10-4ubuntu1.9+esm1","3.4.10-4ubuntu1.9+esm2","3.4.10-4ubuntu1.9+esm3","3.4.10-4ubuntu1.9+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"gnutls-bin","binary_version":"3.4.10-4ubuntu1.9+esm4"},{"binary_version":"3.4.10-4ubuntu1.9+esm4","binary_name":"guile-gnutls"},{"binary_name":"libgnutls-openssl27","binary_version":"3.4.10-4ubuntu1.9+esm4"},{"binary_name":"libgnutls30","binary_version":"3.4.10-4ubuntu1.9+esm4"},{"binary_version":"3.4.10-4ubuntu1.9+esm4","binary_name":"libgnutlsxx28"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-0361.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","3.5.18-1ubuntu1.3","3.5.18-1ubuntu1.4","3.5.18-1ubuntu1.5","3.5.18-1ubuntu1.6","3.5.18-1ubuntu1.6+esm1","3.5.18-1ubuntu1.6+esm2","3.5.18-1ubuntu1.6+esm3","3.5.18-1ubuntu1.6+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"gnutls-bin","binary_version":"3.5.18-1ubuntu1.6+esm4"},{"binary_name":"libgnutls-dane0","binary_version":"3.5.18-1ubuntu1.6+esm4"},{"binary_name":"libgnutls-openssl27","binary_version":"3.5.18-1ubuntu1.6+esm4"},{"binary_name":"libgnutls30","binary_version":"3.5.18-1ubuntu1.6+esm4"},{"binary_version":"3.5.18-1ubuntu1.6+esm4","binary_name":"libgnutlsxx28"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-0361.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.13-2ubuntu1.8"}]}],"versions":["3.6.9-5ubuntu1","3.6.9-5ubuntu2","3.6.10-5","3.6.11.1-2","3.6.11.1-2ubuntu2","3.6.13-2ubuntu1","3.6.13-2ubuntu1.1","3.6.13-2ubuntu1.2","3.6.13-2ubuntu1.3","3.6.13-2ubuntu1.6","3.6.13-2ubuntu1.7"],"ecosystem_specific":{"binaries":[{"binary_name":"gnutls-bin","binary_version":"3.6.13-2ubuntu1.8"},{"binary_name":"guile-gnutls","binary_version":"3.6.13-2ubuntu1.8"},{"binary_name":"libgnutls-dane0","binary_version":"3.6.13-2ubuntu1.8"},{"binary_version":"3.6.13-2ubuntu1.8","binary_name":"libgnutls-openssl27"},{"binary_version":"3.6.13-2ubuntu1.8","binary_name":"libgnutls30"},{"binary_version":"3.6.13-2ubuntu1.8","binary_name":"libgnutlsxx28"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-0361.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/gnutls28?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.3-4ubuntu1.2"}]}],"versions":["3.7.1-5ubuntu1","3.7.2-2ubuntu1","3.7.2-4ubuntu1","3.7.2-5ubuntu1","3.7.3-4ubuntu1","3.7.3-4ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"gnutls-bin","binary_version":"3.7.3-4ubuntu1.2"},{"binary_name":"guile-gnutls","binary_version":"3.7.3-4ubuntu1.2"},{"binary_version":"3.7.3-4ubuntu1.2","binary_name":"libgnutls-dane0"},{"binary_name":"libgnutls-openssl27","binary_version":"3.7.3-4ubuntu1.2"},{"binary_name":"libgnutls30","binary_version":"3.7.3-4ubuntu1.2"},{"binary_version":"3.7.3-4ubuntu1.2","binary_name":"libgnutlsxx28"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-0361.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}