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But this week , researchers at Positive Technologies revealed a new security flaw in the subsystem that could let attackers compromise its MFS file system .
 this week: time; researchers: discoverer; a new security flaw: vulnerability; the subsystem: vulnerable system; let attackers compromise its MFS file system: capabilities; Positive Technologies: discoverer
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:
 this week: time; researchers: discoverer; a new security flaw: vulnerability; the subsystem: vulnerable system; let attackers compromise its MFS file system: capabilities; Positive Technologies: discoverer