{"id":"UBUNTU-CVE-2018-0732","details":"During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).","modified":"2026-02-04T02:57:19.940922Z","published":"2018-06-12T00:00:00Z","related":["USN-3692-1","USN-3692-2"],"upstream":["CVE-2018-0732"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-0732"},{"type":"REPORT","url":"https://www.openssl.org/news/secadv/20180612.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3692-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3692-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-0732"}],"affected":[{"package":{"name":"openssl","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/openssl@1.0.1f-1ubuntu2.26?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1f-1ubuntu2.26"}]}],"versions":["1.0.1e-3ubuntu1","1.0.1e-4ubuntu1","1.0.1e-4ubuntu2","1.0.1e-4ubuntu3","1.0.1e-4ubuntu4","1.0.1f-1ubuntu1","1.0.1f-1ubuntu2","1.0.1f-1ubuntu2.1","1.0.1f-1ubuntu2.2","1.0.1f-1ubuntu2.3","1.0.1f-1ubuntu2.4","1.0.1f-1ubuntu2.5","1.0.1f-1ubuntu2.7","1.0.1f-1ubuntu2.8","1.0.1f-1ubuntu2.11","1.0.1f-1ubuntu2.12","1.0.1f-1ubuntu2.15","1.0.1f-1ubuntu2.16","1.0.1f-1ubuntu2.17","1.0.1f-1ubuntu2.18","1.0.1f-1ubuntu2.19","1.0.1f-1ubuntu2.20","1.0.1f-1ubuntu2.21","1.0.1f-1ubuntu2.22","1.0.1f-1ubuntu2.23","1.0.1f-1ubuntu2.24","1.0.1f-1ubuntu2.25"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libssl-dev","binary_version":"1.0.1f-1ubuntu2.26"},{"binary_name":"libssl1.0.0","binary_version":"1.0.1f-1ubuntu2.26"},{"binary_name":"openssl","binary_version":"1.0.1f-1ubuntu2.26"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-0732.json"}},{"package":{"name":"openssl","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/openssl@1.0.2g-1ubuntu4.13?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2g-1ubuntu4.13"}]}],"versions":["1.0.2d-0ubuntu1","1.0.2d-0ubuntu2","1.0.2e-1ubuntu1","1.0.2f-2ubuntu1","1.0.2g-1ubuntu2","1.0.2g-1ubuntu3","1.0.2g-1ubuntu4","1.0.2g-1ubuntu4.1","1.0.2g-1ubuntu4.2","1.0.2g-1ubuntu4.4","1.0.2g-1ubuntu4.5","1.0.2g-1ubuntu4.6","1.0.2g-1ubuntu4.8","1.0.2g-1ubuntu4.9","1.0.2g-1ubuntu4.10","1.0.2g-1ubuntu4.11","1.0.2g-1ubuntu4.12"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libssl-dev","binary_version":"1.0.2g-1ubuntu4.13"},{"binary_name":"libssl1.0.0","binary_version":"1.0.2g-1ubuntu4.13"},{"binary_name":"openssl","binary_version":"1.0.2g-1ubuntu4.13"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-0732.json"}},{"package":{"name":"openssl","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/openssl@1.1.0g-2ubuntu4.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.0g-2ubuntu4.1"}]}],"versions":["1.0.2g-1ubuntu13","1.0.2g-1ubuntu14","1.0.2n-1ubuntu1","1.1.0g-2ubuntu1","1.1.0g-2ubuntu2","1.1.0g-2ubuntu3","1.1.0g-2ubuntu4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libssl-dev","binary_version":"1.1.0g-2ubuntu4.1"},{"binary_name":"libssl1.1","binary_version":"1.1.0g-2ubuntu4.1"},{"binary_name":"openssl","binary_version":"1.1.0g-2ubuntu4.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-0732.json"}},{"package":{"name":"openssl1.0","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/openssl1.0@1.0.2n-1ubuntu5.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2n-1ubuntu5.1"}]}],"versions":["1.0.2n-1ubuntu2","1.0.2n-1ubuntu3","1.0.2n-1ubuntu4","1.0.2n-1ubuntu5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libssl1.0-dev","binary_version":"1.0.2n-1ubuntu5.1"},{"binary_name":"libssl1.0.0","binary_version":"1.0.2n-1ubuntu5.1"},{"binary_name":"openssl1.0","binary_version":"1.0.2n-1ubuntu5.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-0732.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}