A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured "server signing = required" or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "ctdb" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "ctdb-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libnss-winbind" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libnss-winbind-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libpam-winbind" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libpam-winbind-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libsmbclient" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libsmbclient-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libsmbclient-dev" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libwbclient-dev" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libwbclient0" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "libwbclient0-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "python3-samba" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "python3-samba-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "registry-tools" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "registry-tools-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-common" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-common-bin" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-common-bin-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-dev" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-dsdb-modules" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-dsdb-modules-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-libs" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-libs-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-testsuite" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-testsuite-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-vfs-modules" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "samba-vfs-modules-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "smbclient" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "smbclient-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "winbind" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu0.20.04.2", "binary_name": "winbind-dbgsym" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "ctdb" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "ctdb-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libnss-winbind" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libnss-winbind-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libpam-winbind" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libpam-winbind-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libsmbclient" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libsmbclient-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libsmbclient-dev" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libwbclient-dev" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libwbclient0" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "libwbclient0-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "python3-samba" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "python3-samba-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "registry-tools" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "registry-tools-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-common" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-common-bin" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-common-bin-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-dev" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-dsdb-modules" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-dsdb-modules-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-libs" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-libs-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-testsuite" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-testsuite-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-vfs-modules" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "samba-vfs-modules-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "smbclient" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "smbclient-dbgsym" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "winbind" }, { "binary_version": "2:4.15.13+dfsg-0ubuntu1.1", "binary_name": "winbind-dbgsym" } ] }