Numerous security issues in X Window System clients
X.Org has disclosed a long list of vulnerabilities that have been fixed in
the X Window System client libraries; most of them expose clients to
attacks by a hostile server. "Most of the time X clients & servers
are run by the same user, with the server more privileged from the clients,
so this is not a problem, but there are scenarios in which a privileged
client can be connected to an unprivileged server, for instance, connecting
a setuid X client (such as a screen lock program) to a virtual X server
(such as Xvfb or Xephyr) which the user has modified to return invalid
data, potentially allowing the user to escalate their privileges."
There are 30 CVE numbers assigned to these vulnerabilities; expect the
distributor updates to start flowing shortly.