This update for xorg-x11-server provides several fixes.
These security issues were fixed:
CVE-2017-13723: Prevent local DoS via unusual characters in XkbAtomText and
XkbStringText (bsc#1051150).
Improve the entropy when generating random data used in X.org server authorization
cookies generation by using getentropy() and getrandom() when available (bsc#1025084)
CVE-2017-12184,CVE-2017-12185,CVE-2017-12186,CVE-2017-12187: Fixed
unvalidated lengths in multiple extensions (bsc#1063034)
CVE-2017-12183: Fixed some unvalidated lengths in the XFIXES
extension. (bsc#1063035)
CVE-2017-12180,CVE-2017-12181,CVE-2017-12182: Fixed various unvalidated
lengths in the XFree86-VidMode/XFree86-DGA/XFree86-DRI extensions
(bsc#1063037)
CVE-2017-12179: Fixed an integer overflow and unvalidated length in
(S)ProcXIBarrierReleasePointer in Xi (bsc#1063038)
CVE-2017-12178: Fixed a wrong extra length check in
ProcXIChangeHierarchy in Xi (bsc#1063039)
CVE-2017-12177: Fixed an unvalidated variable-length request in
ProcDbeGetVisualInfo (bsc#1063040)
CVE-2017-12176: Fixed an unvalidated extra length in
ProcEstablishConnection (bsc#1063041)