{"id":"UBUNTU-CVE-2023-4091","details":"A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module \"acl_xattr\" is configured with \"acl_xattr:ignore system acls = yes\". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.","modified":"2026-01-30T02:42:29.262455Z","published":"2023-10-10T00:00:00Z","related":["USN-6425-1","USN-6425-3"],"upstream":["CVE-2023-4091"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-4091"},{"type":"REPORT","url":"https://www.samba.org/samba/security/CVE-2023-4091.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6425-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6425-3"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-4091"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","2:4.1.6+dfsg-1ubuntu2.14.04.11","2:4.1.6+dfsg-1ubuntu2.14.04.12","2:4.1.6+dfsg-1ubuntu2.14.04.13","2:4.3.8+dfsg-0ubuntu0.14.04.2","2:4.3.9+dfsg-0ubuntu0.14.04.1","2:4.3.9+dfsg-0ubuntu0.14.04.3","2:4.3.11+dfsg-0ubuntu0.14.04.1","2:4.3.11+dfsg-0ubuntu0.14.04.2","2:4.3.11+dfsg-0ubuntu0.14.04.3","2:4.3.11+dfsg-0ubuntu0.14.04.4","2:4.3.11+dfsg-0ubuntu0.14.04.6","2:4.3.11+dfsg-0ubuntu0.14.04.7","2:4.3.11+dfsg-0ubuntu0.14.04.8","2:4.3.11+dfsg-0ubuntu0.14.04.9","2:4.3.11+dfsg-0ubuntu0.14.04.10","2:4.3.11+dfsg-0ubuntu0.14.04.11","2:4.3.11+dfsg-0ubuntu0.14.04.12","2:4.3.11+dfsg-0ubuntu0.14.04.13","2:4.3.11+dfsg-0ubuntu0.14.04.14","2:4.3.11+dfsg-0ubuntu0.14.04.16","2:4.3.11+dfsg-0ubuntu0.14.04.17","2:4.3.11+dfsg-0ubuntu0.14.04.19","2:4.3.11+dfsg-0ubuntu0.14.04.20","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm3","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm4","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm6","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm8","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm9","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm12","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm14","2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"],"ecosystem_specific":{"binaries":[{"binary_name":"libnss-winbind","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libpam-smbpass","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libpam-winbind","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libparse-pidl-perl","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libsmbclient","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libsmbclient-dev","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libsmbsharemodes-dev","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libsmbsharemodes0","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libwbclient-dev","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"libwbclient0","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"python-samba","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"registry-tools","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-common","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-common-bin","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-dev","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-libs","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-testsuite","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"smbclient","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"},{"binary_name":"winbind","binary_version":"2:4.3.11+dfsg-0ubuntu0.14.04.20+esm15"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-4091.json"}},{"package":{"name":"samba","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.16.04.34+esm4?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:4.1.17+dfsg-4ubuntu2","2:4.1.20+dfsg-1ubuntu1","2:4.1.20+dfsg-1u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