ISIS access to passport printing machine and blank passports

“The intelligence community is concerned that they [ISIS] have the ability, the capability to manufacture fraudulent passports, which is a concern in any setting,”

Yes - an issue of concern.  To manufacture a passport is a complex process, even with the equipment available.  Discussion on this topic also recognises that ISIS may have access to blank genuine passports.

It is critical for authorities and those with responsibilty for assessing Syrian passports to have a heightened understanding of the manufacture and security features of both the production and issuance of the document.