The Snort Community Rule Set is available for immediate download at: https://www.snort.org/downloads.
Rules 31975-31978,31985 cover this vulnerability from several different attack vectors. Further research is under way on additional attack vectors, and further coverage will be posted at that time.
If you run a pulledpork update, and have the community ruleset enabled (which it is by default):
You will download the latest update.