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Samsung Android JACK ASLR Bypass

Samsung Android JACK ASLR Bypass
Posted Jul 6, 2016
Authored by Google Security Research, Mark Brand

The usermode audio subsystem for the "Samsung Android Professional Audio" is based on JACK, which appears to be designed for single-user usage. The common JACK configuration on Linux systems appears to be a JACK server running under the current user account, and interacting with JACK clients from the same user account; so with a minimal privilege difference; this is not the case with the configuration on Android, where the JACK service runs as a more privileged user in a less restrictive SELinux domain to the clients that can connect to it. The JACK shared memory implementation uses the struct jack_shm_info_t defined in /common/shm.h to do some bookkeeping. This struct is stored at the start of every JackShmAble object. This means that whenever the JACK server creates an object backed by shared memory, it also stores a pointer to that object (in the address space of the JACK server), allowing a malicious client to bypass ASLR in the JACK server process.

tags | advisory
systems | linux
MD5 | 8288db414362e6a728044ca93ad526bf

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