Heap-Buffer-Overflow Vulnerability Discovered in FFmpeg's EXIF Writer for Image Formats
By
retr0reg
Crackles when you bite it. Shows the baker did the work.
Summary
The article details the discovery of a four-byte heap-buffer-overflow vulnerability in FFmpeg's EXIF writer when processing extra IFD (Image File Directory) tags. This security bug affects common image formats like PNG, JPG, WebP, and AVIF. The author provides technical analysis of the vulnerability's root cause within FFmpeg's internal EXIF processing mechanisms, offering insights into both the security flaw and how EXIF handling works under the hood. The bug was caught shortly after its introduction, and the article serves as both a security disclosure and educational deep dive into FFmpeg's codebase.
Key quotes
· 5 pulledWe recently found a cool four-bytes heap-buffer-overflow in FFmpeg's avcodec/exif during the processing of IFDs (Image File Directory).
This affects .png, .jpg, .webp, .avif … the formats we use most often.
The cause of this bug is very interesting, and I don't want to spoil it here; I want you to find out.
It's also a short in-depth dive of FFmpeg internal workings of EXIFs, something we use so often.
This bug wasn't in FFmpeg long. We happened to catch it about three days after it go
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