Two security issues have been discovered in the X.org X server, which may lead to privilege escalation or an information leak. For the oldstable distribution (jessie), these problems have been fixed

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Debian Security Advisory DSA-3905-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                       Moritz Muehlenhoff
July 09, 2017                         https://www.debian.org/security/faq
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Package        : xorg-server
CVE ID         : CVE-2017-10971 CVE-2017-10972
Debian Bug     : 867492

Two security issues have been discovered in the X.org X server, which
may lead to privilege escalation or an information leak.
  
For the oldstable distribution (jessie), these problems have been fixed
in version 2:1.16.4-1+deb8u1.

For the stable distribution (stretch), these problems have been fixed in
version 2:1.19.2-1+deb9u1. Setups running root-less X are not affected.

For the testing distribution (buster), these problems have been fixed
in version 2:1.19.3-2.

For the unstable distribution (sid), these problems have been fixed in
version 2:1.19.3-2.

We recommend that you upgrade your xorg-server packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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