Heap-based Buffer Overflow Affecting gpac4ios package, versions >=0.0.0
Snyk CVSS
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Test your applications- Snyk ID SNYK-COCOAPODS-GPAC4IOS-1567339
- published 19 Aug 2021
- disclosed 19 Aug 2021
- credit Cisco Talos
Introduced: 19 Aug 2021
CVE-2021-21856 Open this link in a new tabHow to fix?
There is no fixed version for GPAC4iOS.
Overview
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 Heap-based Buffer Overflow. The following function is responsible for parsing atoms that use the svhd FOURCC code. This implementation is used to read a string from the atom’s contents. At line 25, the function will take the 64-bit atom size, add 1 to it, and then truncate it to 32-bits prior to passing it to the gf_malloc function. Due to the 32-bit truncation, if the atom size is set to UINT_MAX, this can result in a zero-sized buffer being returned by gf_malloc. After verifying the allocation was successful, the function will read the contents of the atom into the zero-sized array, and then null-terminate the string. Due to the size of the buffer being 0, this will write outside the bounds of the allocation resulting in a heap-based buffer overflow.