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Ars Technica notes that security researcher Karsten Nohl demonstrated the potential impact of the flaws in SS7 last year by recording calls and tracking the location of U.S. Rep. Ted Lieu .
 security researcher Karsten Nohl: discoverer; the flaws: vulnerability; SS7: vulnerable system; last year: time
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:
 security researcher Karsten Nohl: discoverer; the flaws: vulnerability; SS7: vulnerable system; last year: time