RUSTSEC-2021-0078

Lenient hyper header parsing of Content-Length could allow request smuggling

Reported

July 7, 2021

Issued

August 8, 2021 (last modified: October 19, 2021)

Package

hyper (crates.io)

Type

Vulnerability

Keywords

#parsing #http

Aliases

References

https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c

CVSS Score

5.3 MEDIUM

CVSS Details

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Patched

>=0.14.10

Description

hyper's HTTP header parser accepted, according to RFC 7230, illegal contents inside Content-Length headers. Due to this, upstream HTTP proxies that ignore the header may still forward them along if it chooses to ignore the error.

To be vulnerable, hyper must be used as an HTTP/1 server and using an HTTP proxy upstream that ignores the header's contents but still forwards it. Due to all the factors that must line up, an attack exploiting this vulnerability is unlikely.

Advisory available under CC0-1.0 license.