A four year-old vulnerability in an open source component that is a critical part of Google’s Android mobile operating system could leave mobile devices that use it susceptible to attack, according to researchers at the firm Bluebox Security. The vulnerability was disclosed on Tuesday. It affects devices running Android versions 2.1 to 4.4 (“KitKat”), according to a statement released by Bluebox. According to Bluebox, the vulnerability was introduced to Android by way of the open source Apache Harmony module. It affects Android’s verification of digital signatures that are used to vouch for the identity of mobile applications, according to Jeff Forristal, Bluebox’s CTO. He will be presenting details about the FakeID vulnerability at the Black Hat Briefings security conference in Las Vegas next week.