A design flaw was found in Samba's DirSync control implementation, which exposes passwords and secrets in Active Directory to privileged users and Read-Only Domain Controllers (RODCs). This flaw allows RODCs and users possessing the GET_CHANGES right to access all attributes, including sensitive secrets and passwords. Even in a default setup, RODC DC accounts, which should only replicate some passwords, can gain access to all domain secrets, including the vital krbtgt, effectively eliminating the RODC / DC distinction. Furthermore, the vulnerability fails to account for error conditions (fail open), like out-of-memory situations, potentially granting access to secret attributes, even under low-privileged attacker influence.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-libs": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "registry-tools": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-common-bin": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libwbclient0-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-dsdb-modules-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libpam-winbind-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libnss-winbind-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "python3-samba-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "winbind": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-vfs-modules": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-common-bin-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-testsuite": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "smbclient-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libsmbclient": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libsmbclient-dev": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libwbclient0": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-dsdb-modules": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "python3-samba": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-vfs-modules-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "registry-tools-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "ctdb": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libnss-winbind": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libsmbclient-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-libs-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "winbind-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-testsuite-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-common": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "libpam-winbind": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "smbclient": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "samba-dev": "2:4.15.13+dfsg-0ubuntu0.20.04.6", "ctdb-dbgsym": "2:4.15.13+dfsg-0ubuntu0.20.04.6" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "libwbclient-dev": "2:4.15.13+dfsg-0ubuntu1.5", "samba-libs": "2:4.15.13+dfsg-0ubuntu1.5", "registry-tools": "2:4.15.13+dfsg-0ubuntu1.5", "samba-common-bin": "2:4.15.13+dfsg-0ubuntu1.5", "libwbclient0-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "samba-dsdb-modules-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "libpam-winbind-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "libnss-winbind-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "python3-samba-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "winbind": "2:4.15.13+dfsg-0ubuntu1.5", "samba-vfs-modules": "2:4.15.13+dfsg-0ubuntu1.5", "samba-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "samba-common-bin-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "samba-testsuite": "2:4.15.13+dfsg-0ubuntu1.5", "smbclient-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "libsmbclient": "2:4.15.13+dfsg-0ubuntu1.5", "samba": "2:4.15.13+dfsg-0ubuntu1.5", "libsmbclient-dev": "2:4.15.13+dfsg-0ubuntu1.5", "libwbclient0": "2:4.15.13+dfsg-0ubuntu1.5", "samba-dsdb-modules": "2:4.15.13+dfsg-0ubuntu1.5", "python3-samba": "2:4.15.13+dfsg-0ubuntu1.5", "samba-vfs-modules-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "registry-tools-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "ctdb": "2:4.15.13+dfsg-0ubuntu1.5", "libnss-winbind": "2:4.15.13+dfsg-0ubuntu1.5", "libsmbclient-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "samba-libs-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "winbind-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "samba-testsuite-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5", "samba-common": "2:4.15.13+dfsg-0ubuntu1.5", "libpam-winbind": "2:4.15.13+dfsg-0ubuntu1.5", "smbclient": "2:4.15.13+dfsg-0ubuntu1.5", "samba-dev": "2:4.15.13+dfsg-0ubuntu1.5", "ctdb-dbgsym": "2:4.15.13+dfsg-0ubuntu1.5" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "ldb-tools": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "libldb2-dbgsym": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "samba-libs": "2:4.18.6+dfsg-1ubuntu2.1", "registry-tools": "2:4.18.6+dfsg-1ubuntu2.1", "libldb-dev": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "libwbclient0-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-common-bin": "2:4.18.6+dfsg-1ubuntu2.1", "libpam-winbind-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "libnss-winbind-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "libldb2": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "winbind": "2:4.18.6+dfsg-1ubuntu2.1", "samba-vfs-modules": "2:4.18.6+dfsg-1ubuntu2.1", "python3-samba-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "python3-ldb-dbgsym": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "samba-dsdb-modules-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "libwbclient-dev": "2:4.18.6+dfsg-1ubuntu2.1", "samba-common-bin-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-testsuite": "2:4.18.6+dfsg-1ubuntu2.1", "smbclient-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "libsmbclient": "2:4.18.6+dfsg-1ubuntu2.1", "libwbclient0": "2:4.18.6+dfsg-1ubuntu2.1", "samba": "2:4.18.6+dfsg-1ubuntu2.1", "libsmbclient-dev": "2:4.18.6+dfsg-1ubuntu2.1", "samba-dsdb-modules": "2:4.18.6+dfsg-1ubuntu2.1", "python3-samba": "2:4.18.6+dfsg-1ubuntu2.1", "samba-vfs-modules-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "ldb-tools-dbgsym": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "ctdb": "2:4.18.6+dfsg-1ubuntu2.1", "python3-ldb": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1", "registry-tools-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "libnss-winbind": "2:4.18.6+dfsg-1ubuntu2.1", "libsmbclient-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-ad-provision": "2:4.18.6+dfsg-1ubuntu2.1", "winbind-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-testsuite-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-common": "2:4.18.6+dfsg-1ubuntu2.1", "samba-libs-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "samba-ad-dc": "2:4.18.6+dfsg-1ubuntu2.1", "libpam-winbind": "2:4.18.6+dfsg-1ubuntu2.1", "smbclient": "2:4.18.6+dfsg-1ubuntu2.1", "samba-dev": "2:4.18.6+dfsg-1ubuntu2.1", "ctdb-dbgsym": "2:4.18.6+dfsg-1ubuntu2.1", "python3-ldb-dev": "2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1" } ] }