The main idea behind this project is to create corrupt but
structurally valid media files, direct them to the appropriate software
components in Android to be decoded and/or played and monitor the
system for potential issues (i.e system crashes) that may lead to
exploitable vulnerabilities. Custom developed Python scripts are used
to send the malformed data across a distributed infrastructure of
Android devices, log the findings and monitor for possible
issues, in an automated manner. The actual decoding of the media files
on the Android devices is done using the Stagefright command line
interface. The results are sorted out, in an attempt to find only the
unique issues, using a custom built triage mechanism.
structurally valid media files, direct them to the appropriate software
components in Android to be decoded and/or played and monitor the
system for potential issues (i.e system crashes) that may lead to
exploitable vulnerabilities. Custom developed Python scripts are used
to send the malformed data across a distributed infrastructure of
Android devices, log the findings and monitor for possible
issues, in an automated manner. The actual decoding of the media files
on the Android devices is done using the Stagefright command line
interface. The results are sorted out, in an attempt to find only the
unique issues, using a custom built triage mechanism.
Some results – vulnerabilities discovered
- Multiple integer overflows in Stagefright code (libstagefright SampleTable):
- CVE-2014-7915
- CVE-2014-7916
- CVE-2014-7917
- A crafted MPEG4 media file can result in heap corruption in
libstagefright, that can lead to arbitrary code execution in the
mediaserver process:- CVE-2015-3832
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