All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless).
{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "python-samba": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "ctdb": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-common": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "smbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.16.04.25", "ctdb-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.25" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "libwbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-libs": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "registry-tools": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-common-bin": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libwbclient0-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-dsdb-modules-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libpam-winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libnss-winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-vfs-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "python-samba-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-common-bin-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-testsuite": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "smbclient-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libsmbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libwbclient0": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libsmbclient-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "python-samba": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-dsdb-modules": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "registry-tools-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-vfs-modules-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "ctdb": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libnss-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libsmbclient-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-libs-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "winbind-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-testsuite-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-common": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libpam-winbind": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "smbclient": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "samba-dev": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "libparse-pidl-perl": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15", "ctdb-dbgsym": "2:4.7.6+dfsg~ubuntu-0ubuntu2.15" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "libwbclient-dev": "2:4.11.5+dfsg-1ubuntu1", "samba-libs": "2:4.11.5+dfsg-1ubuntu1", "registry-tools": "2:4.11.5+dfsg-1ubuntu1", "samba-common-bin": "2:4.11.5+dfsg-1ubuntu1", "libwbclient0-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "samba-dsdb-modules-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "libpam-winbind-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "libnss-winbind-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "python3-samba-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "winbind": "2:4.11.5+dfsg-1ubuntu1", "samba-vfs-modules": "2:4.11.5+dfsg-1ubuntu1", "samba-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "samba-common-bin-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "samba-testsuite": "2:4.11.5+dfsg-1ubuntu1", "smbclient-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "libsmbclient": "2:4.11.5+dfsg-1ubuntu1", "samba": "2:4.11.5+dfsg-1ubuntu1", "libsmbclient-dev": "2:4.11.5+dfsg-1ubuntu1", "libwbclient0": "2:4.11.5+dfsg-1ubuntu1", "samba-dsdb-modules": "2:4.11.5+dfsg-1ubuntu1", "python3-samba": "2:4.11.5+dfsg-1ubuntu1", "samba-vfs-modules-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "registry-tools-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "ctdb": "2:4.11.5+dfsg-1ubuntu1", "libnss-winbind": "2:4.11.5+dfsg-1ubuntu1", "libsmbclient-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "samba-libs-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "winbind-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "samba-testsuite-dbgsym": "2:4.11.5+dfsg-1ubuntu1", "samba-common": "2:4.11.5+dfsg-1ubuntu1", "libpam-winbind": "2:4.11.5+dfsg-1ubuntu1", "smbclient": "2:4.11.5+dfsg-1ubuntu1", "samba-dev": "2:4.11.5+dfsg-1ubuntu1", "ctdb-dbgsym": "2:4.11.5+dfsg-1ubuntu1" } ] }