Several security issues are addressed for iPhone OS in this update. All of them are applicable to iPhone OS 1.0 through 3.1.2, and iPhone OS for iPod touch 1.1 through 3.1.2. The update will bring your device up to OS3.1.3 Almost all of the issues addressed are serious - many of them are buffer overflow conditions allowing arbitrary code execution for common iPhone activities: watching a maliciously crafted MP4 video viewing a malicious TIFFgraphic accessing a (again, maliciously crafted)FTPsite. There's also a particularly nasty one that uses a memory ...