CVE-2021-32715 Information

Description

hyper is an HTTP library for rust. hyper’s HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a Content-Length header with a prefixed plus sign when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn’t parse such Content-Length headers but forwards them can result in equest smuggling\ or \desync attacks. The flaw exists in all prior versions of hyper prior to 0.14.10 if built with rustc v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the Content-Length header or ensure any upstream proxy handles Content-Length headers with a plus sign prefix.

CVSS Vector

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

Reference

https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739 https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.3