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CVE-2021-32715

Published: 7 July 2021

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 "request 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.

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
rust-hyper
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needed

groovy Does not exist

hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Does not exist

kinetic Ignored
(end of life, was needs-triage)
lunar Not vulnerable
(0.14.19-1)
mantic Not vulnerable
(0.14.19-1)
noble Not vulnerable
(0.14.19-1)
trusty Does not exist

upstream
Released (0.14.10)
xenial Ignored
(end of standard support)

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N