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Test your applicationsUpgrade RHEL:7 gstreamer1-plugins-good to version 0:1.10.4-2.el7 or higher.
This issue was patched in RHSA-2017:2060.
Note: Versions mentioned in the description apply only to the upstream gstreamer1-plugins-good package and not the gstreamer1-plugins-good package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
The vmnc decoder in the gstreamer does not initialize the render canvas, which allows remote attackers to obtain sensitive information as demonstrated by thumbnailing a simple 1 frame vmnc movie that does not draw to the allocated render canvas.