GHSA-5v7r-6r5c-r473
file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header
Quick fix
GHSA-5v7r-6r5c-r473 — file-type: upgrade to the fixed version with the command below.
npm install file-type@21.3.1Details
### Impact A denial of service vulnerability exists in the ASF (WMV/WMA) file type detection parser. When parsing a crafted input where an ASF sub-header has a `size` field of zero, the parser enters an infinite loop. The `payload` value becomes negative (-24), causing `tokenizer.ignore(payload)` to move the read position backwards, so the same sub-header is read repeatedly forever.
Any application that uses `file-type` to detect the type of untrusted/attacker-controlled input is affected. An attacker can stall the Node.js event loop with a 55-byte payload.
### Patches Fixed in version 21.3.1. Users should upgrade to >= 21.3.1.
### Workarounds Validate or limit the size of input buffers before passing them to `file-type`, or run file type detection in a worker thread with a timeout.
### References - Fix commit: 319abf871b50ba2fa221b4a7050059f1ae096f4f
### Reporter
crnkovic@lokvica.com
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