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This second bug , they said , allowed an attacker to create ephemeral user records in the server 's memory , allowing an attacker a short period when they could authenticate using ghost usernames and credentials .
 they: discoverer; allowed an attacker to create ephemeral user records: capabilities; authenticate using ghost usernames and credentials: capabilities; This second bug: vulnerability
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:
 they: discoverer; allowed an attacker to create ephemeral user records: capabilities; authenticate using ghost usernames and credentials: capabilities; This second bug: vulnerability