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" Anyone who views a specially crafted profile gets popped , " a white hat hacker who has found several bugs in Steam in the past , and asked to remain anonymous , told me in a Twitter DM .
 a white hat hacker: discoverer; several bugs: vulnerability; Steam: vulnerable system
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 white hat hacker: discoverer; several bugs: vulnerability; Steam: vulnerable system