{"id":"UBUNTU-CVE-2016-1908","details":"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.","modified":"2026-01-30T00:38:27.722207Z","published":"2016-01-15T00:00:00Z","related":["USN-2966-1"],"upstream":["CVE-2016-1908"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-1908"},{"type":"REPORT","url":"https://lists.mindrot.org/pipermail/openssh-unix-dev/2016-January/034684.html"},{"type":"REPORT","url":"https://thejh.net/written-stuff/openssh-6.8-xsecurity"},{"type":"REPORT","url":"http://seclists.org/oss-sec/2016/q1/115"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-2966-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-1908"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.7?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:6.6p1-2ubuntu2.7"}]}],"versions":["1:6.2p2-6","1:6.2p2-6ubuntu1","1:6.4p1-1","1:6.4p1-2","1:6.5p1-1","1:6.5p1-2","1:6.5p1-3","1:6.5p1-4","1:6.5p1-6","1:6.6p1-1","1:6.6p1-2","1:6.6p1-2ubuntu1","1:6.6p1-2ubuntu2","1:6.6p1-2ubuntu2.2","1:6.6p1-2ubuntu2.3","1:6.6p1-2ubuntu2.4","1:6.6p1-2ubuntu2.6"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:6.6p1-2ubuntu2.7"},{"binary_name":"openssh-server","binary_version":"1:6.6p1-2ubuntu2.7"},{"binary_name":"openssh-sftp-server","binary_version":"1:6.6p1-2ubuntu2.7"},{"binary_name":"ssh","binary_version":"1:6.6p1-2ubuntu2.7"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:6.6p1-2ubuntu2.7"},{"binary_name":"ssh-krb5","binary_version":"1:6.6p1-2ubuntu2.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-1908.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}