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.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HDebian
OSDebian8.0Openbsd OpenSSH
APPOpenbsd< 7.2Oracle Linux
OSOracle67Red Hat Enterprise Linux Desktop
OSRedhat6.07.0Red Hat Enterprise Linux Eus
OSRedhat7.27.37.47.57.67.7Red Hat Enterprise Linux Server
OSRedhat6.07.0Red Hat Enterprise Linux Server Aus
OSRedhat7.27.37.47.67.7Red Hat Enterprise Linux Server Tus
OSRedhat7.27.37.67.7Red Hat Enterprise Linux Workstation
OSRedhat6.07.0
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CHECK WITH VENDOR
No clear patch data available. Check vendor references.
Tags
Auth Bypass
References
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