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Bug 596574 - cve-2016-7942 and forwards: Multiple vulnerabilities in X11 protocol libraries
Summary: cve-2016-7942 and forwards: Multiple vulnerabilities in X11 protocol libraries
Status: RESOLVED DUPLICATE of bug 596182
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Depends on:
Reported: 2016-10-08 19:42 UTC by Ian Zimmerman
Modified: 2016-10-08 20:45 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


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Description Ian Zimmerman 2016-10-08 19:42:17 UTC
According to the post on oss-security [1], where pointers to upstream fixes can also be found:

Tobias Stoeckmann from the OpenBSD project has discovered a number of
issues in the way various X client libraries handle the responses they
receive from servers, and has worked with X.Org's security team to
analyze, confirm, and fix these issues. These issue come in addition
to the ones discovered by Ilja van Sprundel in 2013.

Most of these issues stem from the client libraries trusting the
server to send correct protocol data, and not verifying that the
values will not overflow or cause other damage. Most of the time X
clients & servers are run by the same user, with the server more
privileged than 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.


Reproducible: Always
Comment 1 Mart Raudsepp gentoo-dev 2016-10-08 20:45:34 UTC

*** This bug has been marked as a duplicate of bug 596182 ***