Published: 19 July 2022
DOS / potential heap overwrite in mkv demuxing using zlib decompression. Integer overflow in matroskademux element in gst_matroska_decompress_data function which causes a segfault, or could cause a heap overwrite, depending on libc and OS. Depending on the libc used, and the underlying OS capabilities, it could be just a segfault or a heap overwrite. If the libc uses mmap for large chunks, and the OS supports mmap, then it is just a segfault (because the realloc before the integer overflow will use mremap to reduce the size of the chunk, and it will start to write to unmapped memory). However, if using a libc implementation that does not use mmap, or if the OS does not support mmap while using libc, then this could result in a heap overwrite.
Launchpad, Ubuntu, Debian
(out of standard support)
upstream: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/14d306da6da51a762c4dc701d161bb52ab66d774 (not CVE assigned but related)
Severity score breakdown