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.
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{ "availability": "No subscription required", "binaries": [ { "binary_name": "ctdb", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "ctdb-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libnss-winbind", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libnss-winbind-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libpam-winbind", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libpam-winbind-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libparse-pidl-perl", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libsmbclient", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libsmbclient-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libsmbclient-dev", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libwbclient-dev", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libwbclient0", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "libwbclient0-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "python-samba", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "python-samba-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "registry-tools", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "registry-tools-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-common", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-common-bin", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-common-bin-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-dev", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-dsdb-modules", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-dsdb-modules-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-libs", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-libs-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-testsuite", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-testsuite-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-vfs-modules", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "samba-vfs-modules-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "smbclient", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "smbclient-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "winbind", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" }, { "binary_name": "winbind-dbgsym", "binary_version": "2:4.7.6+dfsg~ubuntu-0ubuntu2.5" } ], "ubuntu_priority": "medium" }