Stefan Metzmacher discovered that Samba incorrectly handled certain flags in SMB2/3 client connections. A remote attacker could use this issue to disable client signing and impersonate servers by performing a machine-in-the-middle attack.
Samba has been updated to 4.3.11 in Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. In addition to the security fix, the updated packages contain bug fixes, new features, and possibly incompatible changes.
{ "availability": "No subscription required", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbsharemodes0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-doc": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbsharemodes0": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "python-samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbsharemodes-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbsharemodes-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "python-samba": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libpam-smbpass-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-common": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "smbclient": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.14.04.1", "libpam-smbpass": "2:4.3.11+dfsg-0ubuntu0.14.04.1" } ] }
{ "availability": "No subscription required", "binaries": [ { "libwbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-libs": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "registry-tools": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-common-bin": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libwbclient0-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-dsdb-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libpam-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libnss-winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-vfs-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-common-bin-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-testsuite": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "smbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libsmbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libsmbclient-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libwbclient0": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libparse-pidl-perl-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-dsdb-modules": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "registry-tools-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-vfs-modules-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "python-samba": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "ctdb": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libsmbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libnss-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libsmbclient-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-libs-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-dbg": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-testsuite-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-common": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "winbind-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libpam-winbind": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "smbclient": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libwbclient-dev-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "samba-dev": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "libparse-pidl-perl": "2:4.3.11+dfsg-0ubuntu0.16.04.1", "ctdb-dbgsym": "2:4.3.11+dfsg-0ubuntu0.16.04.1" } ] }