RUSTSEC-2020-0008

Flaw in hyper allows request smuggling by sending a body in GET requests

Reported

March 19, 2020

Issued

October 1, 2020 (last modified: June 13, 2023)

Package

hyper (crates.io)

Type

Vulnerability

Categories

format-injection

Keywords

#http #request-smuggling

Aliases

References

https://github.com/hyperium/hyper/issues/1925

CVSS Score

9.8 CRITICAL

CVSS Details

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

CVSS Vector

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

Patched

>=0.12.34

Unaffected

<0.11.0

Description

Vulnerable versions of hyper allow GET requests to have bodies, even if there is no Transfer-Encoding or Content-Length header. As per the HTTP 1.1 specification, such requests do not have bodies, so the body will be interpreted as a separate HTTP request.

This allows an attacker who can control the body and method of an HTTP request made by hyper to inject a request with headers that would not otherwise be allowed, as demonstrated by sending a malformed HTTP request from a Substrate runtime. This allows bypassing CORS restrictions. In combination with other vulnerabilities, such as an exploitable web server listening on loopback, it may allow remote code execution.

The flaw was corrected in hyper version 0.12.34.

Advisory available under CC0-1.0 license.