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A use-after-free vulnerability exists in the ClearKey CAS descrambler component of Android versions 8.0, 8.1, and 9. The flaw is caused by a race condition, which can result in the use of memory after it has been freed. This vulnerability can be exploited locally to escalate privileges without requiring user interaction or additional execution privileges.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a proof-of-concept (PoC) exploit for CVE-2018-9539, a use-after-free (UAF) vulnerability in the Android Media CAS (Conditional Access System) service. The exploit is implemented in a single C++ file (cas_race_uaf.cpp) and is designed to be built as part of the Android Open Source Project (AOSP) external modules. The exploit works by creating two CAS sessions, assigning one to a descrambler, and then racing multiple threads that call the descramble method while switching the descrambler's session to the second session. This race condition can trigger a UAF, causing the service to crash, as demonstrated in the provided output. The exploit targets Android versions 8.1 and 9.0 prior to the November 2018 security patch. The repository includes build instructions and a README with example output. No network endpoints are involved; the attack vector is local, requiring code execution privileges on the target device.
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