DNS exfiltration issue with null bytes MSSQL

[brenocss]

Describe the bug

When performing DNS exfiltration on MS SQL, some responses come in the UTF16 format. SQLmap is not properly handling this case and having trouble pulling the next queries since it "thinks" that the tables, columns, and database have these null bytes characters.

To Reproduce
Exfil dns

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Running environment:

• {1.7.5#stable}
• pip
• ubuntu
• Python 3.10.6

Target details:

• MSSQL
• SQLi techniques DNS

Additional context
I made this "quick fix" for my case, but it will certainly break in other cases.

@@ -97,6 +97,10 @@ def dnsUse(payload, expression):
             output = decodeDbmsHexValue(output) if conf.hexConvert else output

             kb.dnsMode = False
+            try:
+                output = output.replace('\x00', "")
+            except:
+                pass

[brenocss]

shoudn't this be only applied when db is mssql?

[stamparm]

@brenocss not the same commit has been done