{"id":"CVE-2018-12437","aliases":["DEBIAN-CVE-2018-12437","EUVD-2018-4408","MGASA-2018-0339","UBUNTU-CVE-2018-12437","openSUSE-SU-2024:11003-1"],"status":"published","title":"Updated libtomcrypt packages fix security vulnerability","description":"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.","severity":{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00536,"percentile":0.45447,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2018-06-15T02:00:00Z","modified":"2026-10-24T10:31:03Z","fixes":[{"ecosystem":"Debian:12","package":"libtomcrypt","fixed_in":["1.18.2-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libtomcrypt","fixed_in":["1.18.2-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libtomcrypt","fixed_in":["1.18.2-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:14.04:LTS","package":"libtomcrypt","fixed_in":["1.17-5ubuntu0.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"libtomcrypt","fixed_in":["1.17-7ubuntu0.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"libtomcrypt","fixed_in":["1.18.1-1ubuntu0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.2-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.2-1"}]}]},{"source":"osv","ecosystem":"Mageia:6","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-11.1.mga6"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-5ubuntu0.1"}]}],"versions":["1.17-3.2ubuntu1","1.17-5"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17-7ubuntu0.1"}]}],"versions":["1.17-7"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libtomcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.18.1-1ubuntu0.1"}]}],"versions":["1.17-9","1.18.0-1","1.18.1-1"]}],"products":[{"vendor":"libtom","product":"libtomcrypt"},{"vendor":"trustedfirmware","product":"op-tee"}],"references":[{"url":"https://www.nccgroup.trust/us/our-research/technical-advisory-return-of-the-hidden-number-problem/","tags":["x_refsource_MISC","x_transferred","Exploit","Technical Description","Third Party Advisory","evidence","report"]},{"url":"https://security.gentoo.org/glsa/202007-53","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-12437","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2018-0339.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=23335","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2018-12437","tags":["report"]},{"url":"https://github.com/libtom/libtomcrypt/issues/407","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-12437","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2018-0739","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12437","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-12437","description":"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.","status":"published","published":"2018-06-15T02:00:00Z","modified":"2024-08-05T08:38:06.074Z","updated_at":"2026-11-02T14:35:06.320867Z"}],"euvd":[{"id":"EUVD-2018-4408","description":"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.","status":"published","published":"2018-06-15T02:00:00Z","modified":"2024-08-05T08:38:06Z","updated_at":"2026-11-03T02:39:52.61924Z"}],"nvd":[{"id":"CVE-2018-12437","description":"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.","status":"published","published":"2018-06-15T02:29:00.487Z","modified":"2026-06-17T01:37:47.087Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":1.9,"vector":"AV:L/AC:M/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:04:29.837913Z"}],"osv":[{"id":"CVE-2018-12437","description":"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.","status":"published","published":"2018-06-15T02:29:00.487Z","modified":"2026-10-24T10:31:03.606777515Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:07.934182Z"},{"id":"DEBIAN-CVE-2018-12437","description":"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.","status":"published","published":"2018-06-15T02:29:00.487Z","modified":"2026-10-23T18:03:53.778450971Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:30.290351Z"},{"id":"UBUNTU-CVE-2018-12437","description":"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.","status":"published","published":"2018-06-15T02:29:00Z","modified":"2026-04-22T11:43:41.900606Z","cvss":[{"version":"3.1","score":4.9,"vector":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium"},{"version":"3.0","score":4.9,"vector":"CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:17.014176Z"},{"id":"MGASA-2018-0339","title":"Updated libtomcrypt packages fix security vulnerability","description":"libtomcrypt has been updated to secure it against two security\nvulnerabilities.\n\nA problem in the ASN.1 parser could cause a stack overflow and a resulting\ndenial of service when parsing deeply recursive ASN.1 types (CVE-2018-0739).\n\nAn attacker capable of triggering signatures and mounting a side channel\nattack against a victim can extract an ECDSA key in a practical amount\nof time (CVE-2018-12437).\n","status":"published","published":"2018-08-15T15:45:26Z","modified":"2026-04-16T06:22:21.465890048Z","updated_at":"2026-11-02T15:49:40.793816Z"},{"id":"openSUSE-SU-2024:11003-1","title":"libtomcrypt-devel-1.18.2-2.10 on GA media","description":"These are all security issues fixed in the libtomcrypt-devel-1.18.2-2.10 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:38:35.89028Z","updated_at":"2026-11-02T16:58:34.894275Z"}]}}