Out-of-Bounds Affecting gpac4ios package, versions >=0.0.0
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Test your applications- Snyk ID SNYK-COCOAPODS-GPAC4IOS-1567338
- published 19 Aug 2021
- disclosed 19 Aug 2021
- credit Cisco Talos
Introduced: 19 Aug 2021
CVE-2021-21855 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 Out-of-Bounds. The following function is responsible for parsing atoms that use the sdp FOURCC code. This function will start by clamping the 64-bit size to a 32-bit integer and assigning it to the “length” variable at line 22. Afterwards at line 23, the library will add 1 to the length and use it to allocate space on the heap. If this “length” is set to UINT_MAX, this addition will cause an integer overflow which when passed to the gf_malloc function can result in a zero-sized allocation being made. Afterwards at line 24, the library will use the UINT_MAX length to read data from the atom into the zero-sized allocation. This and the null-termination will write outside the bounds of the buffer resulting in the corruption of memory.