{"id":"USN-5174-2","summary":"samba regression","details":"USN-5174-1 fixed vulnerabilities in Samba. Some of the changes introduced a\nregression in Kerberos authentication in certain environments.\n\nPlease see the following upstream bug for more information:\nhttps://bugzilla.samba.org/show_bug.cgi?id=14922\n\nThis update fixes the problem.\n\nOriginal advisory details:\n\n Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client\n connections. A remote attacker could possibly use this issue to downgrade\n connections to plaintext authentication. (CVE-2016-2124)\n \n Andrew Bartlett discovered that Samba incorrectly mapping domain users to\n local users. An authenticated attacker could possibly use this issue to\n become root on domain members. (CVE-2020-25717)\n \n Andrew Bartlett discovered that Samba did not properly check sensitive\n attributes. An authenticated attacker could possibly use this issue to\n escalate privileges. (CVE-2020-25722)\n \n Joseph Sutton discovered that Samba incorrectly handled certain TGS\n requests. An authenticated attacker could possibly use this issue to cause\n Samba to crash, resulting in a denial of service. (CVE-2021-3671)\n \n The fix for CVE-2020-25717 results in possible behaviour changes that could\n affect certain environments. Please see the upstream advisory for more\n information:\n \n https://www.samba.org/samba/security/CVE-2020-25717.html\n","modified":"2026-04-22T10:19:42.455809Z","published":"2021-12-13T19:55:15Z","references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5174-2"},{"type":"REPORT","url":"https://launchpad.net/bugs/1950363"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.27?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27"}]}],"versions":["2:4.6.7+dfsg-1ubuntu3","2:4.7.1+dfsg-1ubuntu1","2:4.7.3+dfsg-1ubuntu1","2:4.7.4+dfsg-1ubuntu1","2:4.7.6+dfsg~ubuntu-0ubuntu1","2:4.7.6+dfsg~ubuntu-0ubuntu2","2:4.7.6+dfsg~ubuntu-0ubuntu2.2","2:4.7.6+dfsg~ubuntu-0ubuntu2.4","2:4.7.6+dfsg~ubuntu-0ubuntu2.5","2:4.7.6+dfsg~ubuntu-0ubuntu2.6","2:4.7.6+dfsg~ubuntu-0ubuntu2.7","2:4.7.6+dfsg~ubuntu-0ubuntu2.9","2:4.7.6+dfsg~ubuntu-0ubuntu2.10","2:4.7.6+dfsg~ubuntu-0ubuntu2.11","2:4.7.6+dfsg~ubuntu-0ubuntu2.13","2:4.7.6+dfsg~ubuntu-0ubuntu2.14","2:4.7.6+dfsg~ubuntu-0ubuntu2.15","2:4.7.6+dfsg~ubuntu-0ubuntu2.16","2:4.7.6+dfsg~ubuntu-0ubuntu2.17","2:4.7.6+dfsg~ubuntu-0ubuntu2.18","2:4.7.6+dfsg~ubuntu-0ubuntu2.19","2:4.7.6+dfsg~ubuntu-0ubuntu2.20","2:4.7.6+dfsg~ubuntu-0ubuntu2.21","2:4.7.6+dfsg~ubuntu-0ubuntu2.23","2:4.7.6+dfsg~ubuntu-0ubuntu2.24","2:4.7.6+dfsg~ubuntu-0ubuntu2.26"],"ecosystem_specific":{"binaries":[{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"ctdb"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"libnss-winbind"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"libpam-winbind"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"libparse-pidl-perl"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"libsmbclient"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"libwbclient0"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"python-samba"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"registry-tools"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba-common"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba-common-bin"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba-dsdb-modules"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba-libs"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba-testsuite"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"samba-vfs-modules"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"smbclient"},{"binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.27","binary_name":"winbind"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5174-2.json","cves_map":{"cves":[],"ecosystem":"Ubuntu:18.04:LTS"}}}],"schema_version":"1.7.5"}