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 "aclxattr" is configured with "aclxattr: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.
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{ "binaries": [ { "binary_name": "ctdb", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libnss-winbind", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libpam-winbind", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libparse-pidl-perl", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libsmbclient", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libsmbclient-dev", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libwbclient-dev", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "libwbclient0", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "python-samba", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "registry-tools", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-common", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-common-bin", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-dev", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-dsdb-modules", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-libs", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-testsuite", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "samba-vfs-modules", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "smbclient", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" }, { "binary_name": "winbind", "binary_version": "2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3" } ] }
{ "binaries": [ { "binary_name": "ctdb", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libnss-winbind", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libpam-winbind", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libparse-pidl-perl", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libsmbclient", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libsmbclient-dev", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libwbclient-dev", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "libwbclient0", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "python-samba", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "registry-tools", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-common", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-common-bin", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-dev", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-dsdb-modules", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-libs", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-testsuite", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "samba-vfs-modules", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "smbclient", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" }, { "binary_name": "winbind", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2" } ] }
{ "binaries": [ { "binary_name": "ctdb", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "libnss-winbind", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "libpam-winbind", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "libsmbclient", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "libsmbclient-dev", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "libwbclient-dev", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "libwbclient0", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "python3-samba", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "registry-tools", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-common", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-common-bin", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-dev", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-dsdb-modules", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-libs", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-testsuite", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "samba-vfs-modules", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "smbclient", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" }, { "binary_name": "winbind", "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.6" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_name": "ctdb", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "libnss-winbind", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "libpam-winbind", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "libsmbclient", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "libsmbclient-dev", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "libwbclient-dev", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "libwbclient0", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "python3-samba", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "registry-tools", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-common", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-common-bin", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-dev", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-dsdb-modules", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-libs", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-testsuite", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "samba-vfs-modules", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "smbclient", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" }, { "binary_name": "winbind", "binary_version": "2:4.15.13+dfsg-0ubuntu1.5" } ], "availability": "No subscription required" }
{ "binaries": [ { "binary_name": "ctdb", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "ldb-tools", "binary_version": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libldb-dev", "binary_version": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libldb2", "binary_version": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libnss-winbind", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libpam-winbind", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libsmbclient", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libsmbclient-dev", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libwbclient-dev", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "libwbclient0", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "python3-ldb", "binary_version": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "python3-ldb-dev", "binary_version": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "python3-samba", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "registry-tools", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-ad-dc", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-ad-provision", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-common", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-common-bin", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-dev", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-dsdb-modules", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-libs", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-testsuite", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "samba-vfs-modules", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "smbclient", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" }, { "binary_name": "winbind", "binary_version": "2:4.18.6+dfsg-1ubuntu2.1" } ], "availability": "No subscription required" }