CVE-2022-39294 (DoS) Denial of Service from unchecked request length in conduit-hyper

What is CVE-2022-39294?

CVE-2022-39294 is a high-severity denial of service vulnerability in conduit-rust conduit-hyper, published on 31 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

conduit-hyper integrates a conduit application with the hyper server. Prior to version 0.4.2, `conduit-hyper` did not check any limit on a request's length before calling [`hyper::body::to_bytes`](https://docs.rs/hyper/latest/hyper/body/fn.to_bytes.html). An attacker could send a malicious request with an abnormally large `Content-Length`, which could lead to a panic if memory allocation failed for that request. In version 0.4.2, `conduit-hyper` sets an internal limit of 128 MiB per request, otherwise returning status 400 ("Bad Request"). This crate is part of the implementation of Rust's [crates.io](https://crates.io/), but that service is not affected due to its existing cloud infrastructure, which already drops such malicious requests. Even with the new limit in place, `conduit-hyper` is not recommended for production use, nor to directly serve the public Internet.

Weakness: CWE-1284, CWE-400

Which versions are affected by CVE-2022-39294?

3 open source packages ship an affected version, including conduit-hyper. It affects 1 product.

Products include Conduit-Hyper Project Conduit-Hyper.

How do I fix CVE-2022-39294?

Upgrade conduit-hyper to 0.4.2 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-39294 being exploited?

There is no known exploitation of CVE-2022-39294 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9398-5ghf-7pr6, RUSTSEC-2022-0066.