CVE-2023-45675: 0 byte write heap buffer overflow in start_decoder in stb_vorbis
First published: Fri Oct 20 2023(Updated: )
stb_vorbis is a single file MIT licensed library for processing ogg vorbis files. A crafted file may trigger out of bounds write in `f->vendor[len] = (char)'\0';`. The root cause is that if the len read in `start_decoder` is `-1` and `len + 1` becomes 0 when passed to `setup_malloc`. The `setup_malloc` behaves differently when `f->alloc.alloc_buffer` is pre-allocated. Instead of returning `NULL` as in `malloc` case it shifts the pre-allocated buffer by zero and returns the currently available memory block. This issue may lead to code execution.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nothings STB | =1.22 |
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Reference Links
- https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L3652-L3658
- https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L3658
- https://github.com/nothings/stb/blob/5736b15f7ea0ffb08dd38af21067c314d6a3aae9/stb_vorbis.c#L950-L960
- https://securitylab.github.com/advisories/GHSL-2023-145_GHSL-2023-151_stb_image_h/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NMXKOKPP4BKTNUTF5KSRDQAWOUILQZNO/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QVABVF4GEM6BYD5L4L64RCRSXUHY6LGN/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVQ7ONFH5GWLMXYEAJG32A3EUKUCEVCR/
Frequently Asked Questions
What is CVE-2023-45675?
CVE-2023-45675 is a vulnerability in the stb_vorbis library that allows for a 0 byte write heap buffer overflow in the start_decoder function.
How severe is CVE-2023-45675?
CVE-2023-45675 has a severity rating of 7.8, which is considered high.
What is the root cause of CVE-2023-45675?
The root cause of CVE-2023-45675 is an out of bounds write in the f->vendor[len] assignment in the start_decoder function.
What software is affected by CVE-2023-45675?
The stb_vorbis library version 1.22 is affected by CVE-2023-45675.
How can I fix CVE-2023-45675?
To fix CVE-2023-45675, it is recommended to update to a patched version of the stb_vorbis library.
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