{"id":"USN-5142-2","summary":"samba regressions","details":"USN-5142-1 fixed vulnerabilities in Samba. Some of the upstream changes\nintroduced regressions in name mapping and backups.\n\nPlease see the following upstream bugs for more information:\nhttps://bugzilla.samba.org/show_bug.cgi?id=14901\nhttps://bugzilla.samba.org/show_bug.cgi?id=14918\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 correctly sandbox Kerberos\n tickets issues by an RODC. An RODC could print administrator tickets,\n contrary to expectations. (CVE-2020-25718)\n \n Andrew Bartlett discovered that Samba incorrectly handled Kerberos tickets.\n Delegated administrators could possibly use this issue to impersonate\n accounts, leading to total domain compromise. (CVE-2020-25719)\n \n Andrew Bartlett discovered that Samba did not provide stable AD\n identifiers to Kerberos acceptors. (CVE-2020-25721)\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 Stefan Metzmacher discovered that Samba incorrectly handled certain large\n DCE/RPC requests. A remote attacker could possibly use this issue to\n bypass signature requirements. (CVE-2021-23192)\n \n William Ross discovered that Samba incorrectly handled memory. A remote\n attacker could use this issue to cause Samba to crash, resulting in a\n denial of service, or possibly escalate privileges. (CVE-2021-3738)\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":"2026-02-10T04:42:23Z","published":"2021-12-06T14:57:18Z","references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5142-2"},{"type":"REPORT","url":"https://launchpad.net/bugs/1950363"},{"type":"REPORT","url":"https://launchpad.net/bugs/1952187"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.13.14+dfsg-0ubuntu0.20.04.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.13.14+dfsg-0ubuntu0.20.04.3"}]}],"versions":["2:4.10.7+dfsg-0ubuntu2","2:4.10.7+dfsg-0ubuntu3","2:4.11.1+dfsg-3ubuntu1","2:4.11.1+dfsg-3ubuntu2","2:4.11.1+dfsg-3ubuntu4","2:4.11.5+dfsg-1ubuntu1","2:4.11.5+dfsg-1ubuntu2","2:4.11.6+dfsg-0ubuntu1","2:4.11.6+dfsg-0ubuntu1.1","2:4.11.6+dfsg-0ubuntu1.2","2:4.11.6+dfsg-0ubuntu1.3","2:4.11.6+dfsg-0ubuntu1.4","2:4.11.6+dfsg-0ubuntu1.5","2:4.11.6+dfsg-0ubuntu1.6","2:4.11.6+dfsg-0ubuntu1.8","2:4.11.6+dfsg-0ubuntu1.9","2:4.11.6+dfsg-0ubuntu1.10","2:4.13.14+dfsg-0ubuntu0.20.04.1","2:4.13.14+dfsg-0ubuntu0.20.04.2"],"ecosystem_specific":{"binaries":[{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"ctdb"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"libnss-winbind"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"libpam-winbind"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"libsmbclient"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"libsmbclient-dev"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"libwbclient-dev"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"libwbclient0"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"python3-samba"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"registry-tools"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-common"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-common-bin"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-dev"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-dsdb-modules"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-libs"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-testsuite"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"samba-vfs-modules"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"smbclient"},{"binary_version":"2:4.13.14+dfsg-0ubuntu0.20.04.3","binary_name":"winbind"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5142-2.json","cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[]}}}],"schema_version":"1.7.3"}