{"id":"UBUNTU-CVE-2015-5296","details":"Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.","modified":"2026-04-22T10:13:19.582567Z","published":"2015-12-16T00:00:00Z","related":["USN-2855-1"],"upstream":["CVE-2015-5296"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-5296"},{"type":"REPORT","url":"https://www.samba.org/samba/security/CVE-2015-5296.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-2855-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-5296"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.1.6+dfsg-1ubuntu2.14.04.11?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.1.6+dfsg-1ubuntu2.14.04.11"}]}],"versions":["2:3.6.18-1ubuntu3","2:4.0.10+dfsg-4ubuntu2","2:4.0.13+dfsg-1ubuntu1","2:4.1.3+dfsg-2ubuntu2","2:4.1.3+dfsg-2ubuntu3","2:4.1.3+dfsg-2ubuntu4","2:4.1.3+dfsg-2ubuntu5","2:4.1.6+dfsg-1ubuntu1","2:4.1.6+dfsg-1ubuntu2","2:4.1.6+dfsg-1ubuntu2.14.04.1","2:4.1.6+dfsg-1ubuntu2.14.04.2","2:4.1.6+dfsg-1ubuntu2.14.04.3","2:4.1.6+dfsg-1ubuntu2.14.04.4","2:4.1.6+dfsg-1ubuntu2.14.04.5","2:4.1.6+dfsg-1ubuntu2.14.04.7","2:4.1.6+dfsg-1ubuntu2.14.04.8","2:4.1.6+dfsg-1ubuntu2.14.04.9"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libnss-winbind","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"libpam-smbpass","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"libpam-winbind","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"libparse-pidl-perl","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"libsmbclient","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"libsmbsharemodes0","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"libwbclient0","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"python-samba","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"registry-tools","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba-common","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba-common-bin","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba-libs","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba-testsuite","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"smbclient","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"},{"binary_name":"winbind","binary_version":"2:4.1.6+dfsg-1ubuntu2.14.04.11"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-5296.json"}},{"package":{"name":"samba","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.3.3+dfsg-1ubuntu1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.3.3+dfsg-1ubuntu1"}]}],"versions":["2:4.1.17+dfsg-4ubuntu2","2:4.1.20+dfsg-1ubuntu1","2:4.1.20+dfsg-1ubuntu2","2:4.1.20+dfsg-1ubuntu3","2:4.1.20+dfsg-1ubuntu5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"ctdb","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"libnss-winbind","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"libpam-winbind","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"libparse-pidl-perl","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"libsmbclient","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"libwbclient0","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"python-samba","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"registry-tools","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba-common","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba-common-bin","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba-libs","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba-testsuite","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"smbclient","binary_version":"2:4.3.3+dfsg-1ubuntu1"},{"binary_name":"winbind","binary_version":"2:4.3.3+dfsg-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-5296.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}