From this:

...How is it that an undocumented immigrant can use a phony Social Security number to get a government-backed loan to buy property in Colorado? 7NEWS Investigator John Ferrugia has been tracking cases involving Federal Housing Administration loans and said the homeland security implications are dramatic...

"To have a false number -- a Social Security number -- and have the realtor be able to take them all the way through the application process, there has to be something that that realtor or the mortgage company is doing to doctor those documents to show this is a legitimate Social Security number," [Jeff Copp, the regional special agent in charge of Immigration and Customs Enforcement, or ICE] said...

7NEWS wanted to talk to the people who issue the FHA loans at the U.S. Department of Housing and Urban Development. HUD officials were clearly concerned about our findings and refused an on-camera interview. Officials wouldn't answer our questions but in a written statement, they said in part, "FHA loans are originated and processed by FHA-approved lenders who certify that the mortgage is eligible for FHA mortgage insurance ... If irregularities are revealed, appropriate action is taken..."

That illegal aliens are able to sail through the process shouldn't come as much of a surprise. See, for instance, "Who is the FDIC? And, why are they working with a foreign government to subvert our laws?", "Tax-number loans help immigrants buy homes", "Their money or your safety", or "Mexican Consulate helps locals with their papers".