{"id":"UBUNTU-CVE-2018-12437","details":"LibTomCrypt through 1.18.1 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.","modified":"2026-04-22T12:50:06.402079Z","published":"2018-06-15T02:29:00Z","upstream":["CVE-2018-12437"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-12437"},{"type":"REPORT","url":"https://github.com/libtom/libtomcrypt/issues/407"},{"type":"REPORT","url":"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-12437"}],"affected":[{"package":{"name":"libtomcrypt","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/libtomcrypt@1.17-5ubuntu0.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-5ubuntu0.1"}]}],"versions":["1.17-3.2ubuntu1","1.17-5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libtomcrypt0","binary_version":"1.17-5ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-12437.json"}},{"package":{"name":"libtomcrypt","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libtomcrypt@1.17-7ubuntu0.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-7ubuntu0.1"}]}],"versions":["1.17-7"],"ecosystem_specific":{"binaries":[{"binary_name":"libtomcrypt0","binary_version":"1.17-7ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-12437.json"}},{"package":{"name":"libtomcrypt","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libtomcrypt@1.18.1-1ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.1-1ubuntu0.1"}]}],"versions":["1.17-9","1.18.0-1","1.18.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libtomcrypt1","binary_version":"1.18.1-1ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-12437.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}