Bug 2007577 (CVE-2021-32715)

Summary:	CVE-2021-32715 rust-hyper: Lenient Parsing of Content-Length Header When Prefixed with Plus Sign
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	igor.raits, rust-sig
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2021-09-24 12:21:10 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2007578
Bug Blocks:

Description Dhananjay Arunesh 2021-09-24 09:59:28 UTC

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.

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

Comment 1 Dhananjay Arunesh 2021-09-24 09:59:55 UTC

Created rust-hyper tracking bugs for this issue:

Affects: fedora-34 [bug 2007578]

Comment 2 Product Security DevOps Team 2021-09-24 12:21:10 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.