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Poly Systems - SIP Provisioning Attacks

Vulnerability Summary

Poly along with several ITSPs have detected an increase in the number of attacks and reconnaissance efforts against VoIP provisioning services



Attackers are programmatically attacking provisioning services utilizing different vectors attempting to exploit potential weaknesses in the provisioning service to extract service provider provisioning information. In some attacks, the attackers are impersonating legitimate VoIP devices. When successful, the attackers may use this information to commit toll-fraud, caller ID spoofing and SPAM over Internet Telephony (SPIT), launch Denial of Service (DoS) attacks or use the information gathered in other fraudulent VoIP activities.


Last Update: 3/9/2022
Initial Public Release: 2/24/2021
Advisory ID:  PLYGN21-03


One of the best protections against the type of attack is to implement subscriber device authentication using a combination of MAC address authentication and digital certificate Common Name Validation. While this cannot prevent a specific compromised phone from obtaining credentials, it does help prevent an attack vector that uses a single compromised device to attempt to extract information for multiple phones.



There is no workaround.


Any customer using an affected system who is concerned about this vulnerability within their deployment should contact Poly Technical Support(888) 248-4143, (916) 928-7561, or visit the Poly Support Site.


Revision History
1.0 2/22/2021 Initial Release
1.1 2/24/2021 Typographical corrections
2.0 3/9/2022 Format changes 

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