{"id":"UBUNTU-CVE-2019-17455","details":"Libntlm through 1.5 relies on a fixed buffer size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, as demonstrated by a stack-based buffer over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM request.","modified":"2026-04-22T12:14:06.965216Z","published":"2019-10-10T18:15:00Z","related":["USN-5108-1","USN-5108-2"],"upstream":["CVE-2019-17455"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-17455"},{"type":"REPORT","url":"https://gitlab.com/jas/libntlm/issues/2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5108-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-17455"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5108-2"}],"affected":[{"package":{"name":"libntlm","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libntlm@1.4-1ubuntu0.1~esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4-1ubuntu0.1~esm1"}]}],"versions":["1.4-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libntlm0","binary_version":"1.4-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-17455.json"}},{"package":{"name":"libntlm","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libntlm@1.4-7ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4-7ubuntu0.1~esm1"}]}],"versions":["1.4-7"],"ecosystem_specific":{"binaries":[{"binary_name":"libntlm0","binary_version":"1.4-7ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-17455.json"}},{"package":{"name":"libntlm","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libntlm@1.4-8ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4-8ubuntu0.1"}]}],"versions":["1.4-8"],"ecosystem_specific":{"binaries":[{"binary_name":"libntlm0","binary_version":"1.4-8ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-17455.json"}},{"package":{"name":"libntlm","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libntlm@1.5-2ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5-2ubuntu0.1"}]}],"versions":["1.5-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libntlm0","binary_version":"1.5-2ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-17455.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}