The nation’s overburdened foreclosure system is riddled with faked documents, forged signatures and lenders who take shortcuts reviewing borrower’s files, according to court documents and interviews with attorneys, housing advocates and company officials. The problems, which are so widespread that some judges approving the foreclosures ignore them, are coming to light after Ally Financial, the country’s fourth-biggest mortgage lender, halted home evictions in 23 states this week. During the housing boom, millions of homeowners got easy access to mortgages while providing virtually no proof of their income or background. Now, as millions of Americans are being pushed out of the homes they can no longer afford, the foreclosure process is producing far more paperwork than anyone can read, and making it vulnerable to fraud. Ally Financial is now double-checking to make sure all documents are in order after lawsuits uncovered that a single employee of the company’s GMAC mortgage unit signed off on 10,000 foreclosure papers per month without checking whether the information justified an eviction. Many of the homeowners in fact, might have been in default. Some might have been unfairly targeted. But the flawed process is creating an opening for borrowers to contest some of the more than 2 million foreclosures that have taken place since the real estate crisis began.