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Flash Bypass Of Length Vs. Cookie Validation

Flash Bypass Of Length Vs. Cookie Validation
Posted Aug 21, 2015
Authored by Chris Evans, Google Security Research

Flash version 18.0.0.209 contains new mitigations to defend against corruptions of Vector.<uint> (and other) lengths. One of these mitigations, at Vector access time, compares the Vector's in-memory length with a representation of the same length XOR'ed with a secret cookie. The bypass comes about because the secret cookie value is stored inside a structure, and a pointer to that structure is stored alongside the Vector length.

tags | exploit
systems | linux
advisories | CVE-2015-5125
SHA-256 | fcdf12cd364c0ea733d2eac6b27e7d2f9f878fe5206bb8c75cbfc449ce599745
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