Reported

August 31, 2022

Issued

September 13, 2022 (last modified: June 13, 2023)

Package

axum-core (crates.io)

Type

Vulnerability

Categories

• denial-of-service

Keywords

#ddos #oom

Aliases

• CVE-2022-3212
• GHSA-m77f-652q-wwp4

References

• https://github.com/tokio-rs/axum/pull/1346

Patched

• >=0.2.8, <0.3.0-rc.1
• >=0.3.0-rc.2

Description

<bytes::Bytes as axum_core::extract::FromRequest>::from_request would not, by default, set a limit for the size of the request body. That meant if a malicious peer would send a very large (or infinite) body your server might run out of memory and crash.

This also applies to these extractors which used Bytes::from_request internally:

• axum::extract::Form
• axum::extract::Json
• String

The fix is also in axum-core 0.3.0.rc.2 but 0.3.0.rc.1 is vulnerable.

Because axum depends on axum-core it is vulnerable as well. The vulnerable versions of axum are <= 0.5.15 and 0.6.0.rc.1. axum >= 0.5.16 and >= 0.6.0.rc.2 does have the fix and are not vulnerable.

The patched versions will set a 2 MB limit by default.

Advisory available under CC0-1.0 license.