Out-of-Bounds Affecting gpac4ios package, versions >=0.0.0

  • Attack Complexity


  • Availability


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  • snyk-id


  • published

    19 Aug 2021

  • disclosed

    19 Aug 2021

  • credit

    Cisco Talos

How to fix?

There is no fixed version for GPAC4iOS.


GPAC4iOS is a GPAC4iOS is the libgpac library packaged for iOS as a Pod. It is preconfigured and tested to do a single task: create a MP4 file from a raw H.264 and an audio track.

Affected versions of this package are vulnerable to Out-of-Bounds. The function used by the library in order to read the contents of an atom using the url FOURCC code will first check that the 64-atom size is non-zero, and then at line 30 will truncate the atom size to 32-bits when allocating space on the heap. After reading the contents of the atom using the 32-bit truncated size, the function will then use the original 64-bit size when accessing the allocated heap buffer. Due to the allocated size being truncated to 32-bits, this can result in an out-of-bounds read on 64-bit platforms.