The vulnerability is due to query parameters that were passed over SSL. SonicWall does not consider this to be a leak of sensitive information, and considers this a false positive.
4. MD5 signed SSL Certificates
The following URL's were detected to use certificates signed with MD5 algorithm. MD5 Signature Algorithm is obsolete and it can result in Phishing attacks.
Workplace and AMC access by default maybe setup to use Self Signed Certificates during the initial setup. Before deploying it in production, customers are encouraged to use certificates that are signed by more secure algorithms like Sha1 or even SHA2.
For more details, please contact SonicWall Support.