Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call tallocfree() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with tallocfree() and directly calls abort(), terminating the KDC process.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbsharemodes0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-doc": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbsharemodes0": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "python-samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbsharemodes-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbsharemodes-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "python-samba": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libpam-smbpass-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-common": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "smbclient": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.14.04.19", "libpam-smbpass": "2:4.3.11+dfsg-0ubuntu0.14.04.19" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "python-samba": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "ctdb": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-common": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "smbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.16.04.18", "ctdb-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.18" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-libs": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "registry-tools": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-common-bin": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libwbclient0-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-dsdb-modules-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libpam-winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libnss-winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-vfs-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "python-samba-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-common-bin-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-testsuite": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "smbclient-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libsmbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libwbclient0": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libsmbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "python-samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-dsdb-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "registry-tools-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-vfs-modules-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "ctdb": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libnss-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libsmbclient-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-libs-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-testsuite-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-common": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libpam-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "smbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "samba-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "libparse-pidl-perl": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5", "ctdb-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" } ] }