RUSTSEC-2021-0020

Multiple Transfer-Encoding headers misinterprets request payload

Reported

February 5, 2021

Issued

February 5, 2021 (last modified: October 19, 2021)

Package

hyper (crates.io)

Type

Vulnerability

Categories

format-injection

Keywords

#http #request-smuggling

Aliases

References

https://github.com/hyperium/hyper/security/advisories/GHSA-6hfq-h8hq-87mf

CVSS Score

8.1 HIGH

CVSS Details

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

CVSS Vector

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

Patched

>=0.14.3
^0.13.10
^0.12.36

Unaffected

<0.12.0

Description

hyper's HTTP server code had a flaw that incorrectly understands some requests with multiple transfer-encoding headers to have a chunked payload, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that understands the request payload boundary differently can result in "request smuggling" or "desync attacks".

Advisory available under CC0-1.0 license.