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This twisted tale starts in July 2016 , when security researcher Ryan Hanson discovered a flaw in RTF files that he could exploit to execute code on the underlying operating system .
 a flaw: vulnerability; security researcher Ryan Hanson: discoverer; July 2016: time; exploit to execute code on the underlying operating system: capabilities
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 a flaw: vulnerability; security researcher Ryan Hanson: discoverer; July 2016: time; exploit to execute code on the underlying operating system: capabilities