The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.
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{ "availability": "No subscription required", "ubuntu_priority": "low", "binaries": [ { "binary_version": "1:7.2p2-4", "binary_name": "openssh-client" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-client-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-client-ssh1" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-client-ssh1-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-client-udeb" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-client-udeb-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-server" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-server-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-server-udeb" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-server-udeb-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-sftp-server" }, { "binary_version": "1:7.2p2-4", "binary_name": "openssh-sftp-server-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "ssh" }, { "binary_version": "1:7.2p2-4", "binary_name": "ssh-askpass-gnome" }, { "binary_version": "1:7.2p2-4", "binary_name": "ssh-askpass-gnome-dbgsym" }, { "binary_version": "1:7.2p2-4", "binary_name": "ssh-krb5" } ] }