{"id":"UBUNTU-CVE-2018-16868","details":"A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.","modified":"2026-04-22T11:47:40.327556Z","published":"2018-12-03T14:29:00Z","upstream":["CVE-2018-16868"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-16868"},{"type":"REPORT","url":"http://cat.eyalro.net/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-16868"}],"affected":[{"package":{"name":"gnutls26","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/gnutls26@2.12.23-12ubuntu2.8?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.23-1ubuntu4","2.12.23-1ubuntu5","2.12.23-12ubuntu1","2.12.23-12ubuntu2","2.12.23-12ubuntu2.1","2.12.23-12ubuntu2.2","2.12.23-12ubuntu2.3","2.12.23-12ubuntu2.4","2.12.23-12ubuntu2.5","2.12.23-12ubuntu2.6","2.12.23-12ubuntu2.7","2.12.23-12ubuntu2.8"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.11+really2.12.23-12ubuntu2.8","binary_name":"gnutls-bin"},{"binary_version":"2.12.23-12ubuntu2.8","binary_name":"libgnutls-openssl27"},{"binary_version":"2.12.23-12ubuntu2.8","binary_name":"libgnutls26"},{"binary_version":"2.12.23-12ubuntu2.8","binary_name":"libgnutlsxx27"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-16868.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/gnutls28@3.4.10-4ubuntu1.9+esm2?arch=source&distro=esm-infra/xenial"},"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"],"ecosystem_specific":{"binaries":[{"binary_version":"3.4.10-4ubuntu1.9+esm2","binary_name":"gnutls-bin"},{"binary_version":"3.4.10-4ubuntu1.9+esm2","binary_name":"guile-gnutls"},{"binary_version":"3.4.10-4ubuntu1.9+esm2","binary_name":"libgnutls-openssl27"},{"binary_version":"3.4.10-4ubuntu1.9+esm2","binary_name":"libgnutls30"},{"binary_version":"3.4.10-4ubuntu1.9+esm2","binary_name":"libgnutlsxx28"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-16868.json"}},{"package":{"name":"gnutls28","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/gnutls28@3.5.18-1ubuntu1.6+esm2?arch=source&distro=esm-infra/bionic"},"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"],"ecosystem_specific":{"binaries":[{"binary_version":"3.5.18-1ubuntu1.6+esm2","binary_name":"gnutls-bin"},{"binary_version":"3.5.18-1ubuntu1.6+esm2","binary_name":"libgnutls-dane0"},{"binary_version":"3.5.18-1ubuntu1.6+esm2","binary_name":"libgnutls-openssl27"},{"binary_version":"3.5.18-1ubuntu1.6+esm2","binary_name":"libgnutls30"},{"binary_version":"3.5.18-1ubuntu1.6+esm2","binary_name":"libgnutlsxx28"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-16868.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:P/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:P/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"},{"type":"Ubuntu","score":"low"}]}