{"id":"UBUNTU-CVE-2015-1793","details":"The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.","modified":"2025-07-16T08:11:25.160987Z","published":"2015-07-09T00:00:00Z","withdrawn":"2025-07-18T16:43:10Z","upstream":["CVE-2015-1793"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-1793"},{"type":"REPORT","url":"https://mta.openssl.org/pipermail/openssl-announce/2015-July/000037.html"},{"type":"REPORT","url":"https://www.openssl.org/news/secadv_20150709.txt"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-1793"}],"affected":[{"package":{"name":"openssl","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/openssl@1.0.1f-1ubuntu2.15?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1f-1ubuntu2.15"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libcrypto1.0.0-udeb","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libcrypto1.0.0-udeb-dbgsym","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl-dev","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl-dev-dbgsym","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl-doc","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl1.0.0","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl1.0.0-dbg","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl1.0.0-dbgsym","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl1.0.0-udeb","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"libssl1.0.0-udeb-dbgsym","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"openssl","binary_version":"1.0.1f-1ubuntu2.15"},{"binary_name":"openssl-dbgsym","binary_version":"1.0.1f-1ubuntu2.15"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-1793.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}