Описание
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.
Пакеты
| Пакет | Статус | Версия исправления | Релиз | Тип |
|---|---|---|---|---|
| openssh | fixed | 1:7.2p1-1 | package | |
| openssh | no-dsa | wheezy | package | |
| openssh | no-dsa | squeeze | package |
Примечания
Upstream commit: https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c
which needs to be applied after: https://anongit.mindrot.org/openssh.git/commit/?id=f98a09cacff7baad8748c9aa217afd155a4d493f
Background information on X11 SECURITY extension and SSH: https://thejh.net/written-stuff/openssh-6.8-xsecurity
https://lists.mindrot.org/pipermail/openssh-unix-dev/2016-January/034684.html
Red Hat Bugzilla entry: https://bugzilla.redhat.com/show_bug.cgi?id=1298741
vulnerability is partly due to /etc/X11/Xsession.d/35x11-common_xhost-local introduced in x11-common in 1:7.6+9 (wheezy and up)
https://lists.debian.org/debian-lts/2016/01/msg00029.html
Upstream announce: http://www.openssh.com/txt/release-7.2
EPSS
Связанные уязвимости
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.
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.
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.
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.
Уязвимость клиента средства криптографической защиты OpenSSH, позволяющая нарушителю получить доверенные права при взаимодействии с X11-сервером
EPSS