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Researchers at Trustwave are warning of a hidden backdoor in VoIP devices produced by Chinese manufacturer DBL Technology which could allow access by the manufacturer or malicious third parties .
 Researchers: discoverer; a hidden backdoor: vulnerability; VoIP devices: vulnerable system; Chinese manufacturer DBL Technology: vulnerable system owner; allow access by the manufacturer or malicious third parties: capabilities; Trustwave: 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:
 Researchers: discoverer; a hidden backdoor: vulnerability; VoIP devices: vulnerable system; Chinese manufacturer DBL Technology: vulnerable system owner; allow access by the manufacturer or malicious third parties: capabilities; Trustwave: discoverer