Provide references for CVE-2017-18120.
Where can I find more information about CVE-2017-18120?
References are available at: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878739, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=881120, https://github.com/kohler/gifsicle/issues/117, https://github.com/kohler/gifsicle/commit/118a46090c50829dc543179019e6140e1235f909.