added one more level of MSSQL version check (if first fails for some reason)

plugins/dbms/mssqlserver/fingerprint.py

@@ -132,6 +132,16 @@ class Fingerprint(GenericFingerprint):
 
                         break
 
+            if not kb.dbmsVersion or kb.dbmsVersion == ["Unknown"]:
+                for version, check in [\
+                        ("2000", "HOST_NAME()=HOST_NAME()"),\
+                        ("2005", "XACT_STATE()=XACT_STATE()"),\
+                        ("2008", "SYSDATETIME()>0") ]:
+                    result = inject.checkBooleanExpression(check)
+
+                    if result:
+                        kb.dbmsVersion = [version]
+
             if kb.dbmsVersion:
                 setDbms("%s %s" % (DBMS.MSSQL, kb.dbmsVersion[0]))
             else: