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HDX - Improper Verification of Cryptographic Signature

Vulnerability Summary

The Poly HDX uses a software update process that reads in a PUP file containing all of the information and tools needed to properly update the system. A vulnerability has been discovered in the PUP file header MAC signature verification process allowing a malicious user to extract the components of the PUP file. Poly made changes to the HDX software starting with the commercial software build to prevent this vulnerability. The software update process was changed to remove the utilities that would allow a malicious user to potentially modify the PUP file. The HDX PUP file also uses a public key DSA signature to protect the integrity of the file; this additional layer of protection is not compromised by this vulnerability. While users may not notice any change within the user interface, the update process has been improved to address potential security problems.


Last Update: 3/3/2022
Initial Public Release: 3/13/2013
Advisory ID:  PLYTV-13-01

Product Affected
HDX 4000

Prior to and above
HDX 6000

Prior to and above
HDX 7000

Prior to and above
HDX 8000

Prior to and above
HDX 9000

Prior to and above

Poly recommends customers upgrade to firmware build or later.



Only upgrade HDX systems using PUP files obtained from Poly.


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.



Poly would like to thank Moritz Jodeit & Mr. Jodeit of n.runs for reporting security vulnerabilities to us and for their coordinated disclosure.

Revision History
1.0 3/13/2013
Initial Release
2.0 3/3/2022 Format Changes

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