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Brotli CVE-2020-8927 redux (#1127)

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* Create RUSTSEC-0000-0000.md

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Sergey "Shnatsel" Davidoff
2021-12-21 21:48:42 +01:00
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "brotli-sys"
date = "2021-12-20"
url = "https://github.com/bitemyapp/brotli2-rs/issues/45"
references = ["https://github.com/google/brotli/releases/tag/v1.0.9"]
categories = ["memory-corruption"]
keywords = ["integer-overflow"]
aliases = ["CVE-2020-8927"]
[affected]
# There isn't a patch for brotli2-sys, but version 1.0.9 of google/brotli is patched
[versions]
patched = []
```
# Integer overflow in the bundled Brotli C library
A buffer overflow exists in the Brotli library versions prior to 1.0.8 where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB.
An updated version of `brotli-sys` has not been released. If one cannot update the C library, its authors recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.
In Rust the issue can be mitigated by migrating to the `brotli` crate, which provides a Rust implementation of Brotli compression and decompression that is not affected by this issue.