One Perfect Bug: Exploiting Type Confusion in Flash

Summary: Project Zero's Natalie Silvanovich detailed CVE-2015-3077, a type confusion bug in Adobe Flash's Button and MovieClip filter setters that lets any filter type be confused with any other by overwriting the constructor used to initialize a filter object. Reported to Adobe in early February 2015 and fixed in May, the flaw allowed pointers to be read and written directly because filter fields sit at fixed, expected offsets in memory.
What you should know: The exploit's reliability came from chaining filter confusions to defeat ASLR, read a vtable out of a BitmapData object, and build fake objects for code execution - a reminder that a single well-chosen memory corruption bug in a widely deployed runtime can be engineered into dependable code execution.

Read the original at Google Project Zero ↗

Topics: Vulnerabilities & Patching
Mentions: CVE-2015-3077
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