Heap-based Buffer Overflow Affecting gpac4ios package, versions >=0.0.0
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Test your applications- Snyk ID SNYK-COCOAPODS-GPAC4IOS-1567343
- published 19 Aug 2021
- disclosed 19 Aug 2021
- credit Cisco Talos
Introduced: 19 Aug 2021
CVE-2021-21857 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 implementation of the parser for the txtc FOURCC code is responsible for reading a string from the atom, and then null-terminating it. At line 27, the function will take the 32-bit size and add 1 to it before truncating it to a 32-bit integer and then passing it as a parameter to the gf_malloc function. If the atom size is set to UINT_MAX, this addition when truncated to a 32-bit integer can result in an integer overflow causing the allocation to return a zero-sized buffer. Afterwards at line 29, the function will use the original non-truncated atom size to read the contents of the atom into the zero-sized buffer. This will then cause a heap-based buffer overflow when reading the string from the atom, and then null-terminating it.