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CVE-2021-32715— Lenient Parsing of Content-Length Header When Prefixed with Plus Sign

Quick assessment

Affected
hyperium hyper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

hyperium hyper是开源的Rust 的 HTTP 库。旨在成为库和应用程序的构建块。 hyperium hyper存在环境问题漏洞，该漏洞源于hyper 的 HTTP/1 服务器错误地解析和接受带有“Content-Length”标头的请求。

CVSS 3.1 · Low EPSS 0.89% · P57
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I. Basic Information for CVE-2021-32715

Vulnerability Information
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Vulnerability Title
Lenient Parsing of Content-Length Header When Prefixed with Plus Sign
Source: CVE Program / CVE List V5
Vulnerability 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 "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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
hyperium hyper 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
hyperium hyper是开源的Rust 的 HTTP 库。旨在成为库和应用程序的构建块。 hyperium hyper存在环境问题漏洞，该漏洞源于hyper 的 HTTP/1 服务器错误地解析和接受带有“Content-Length”标头的请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
hyperium hyper < 0.14.10 -

II. Public POCs for CVE-2021-32715

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III. Intelligence Information for CVE-2021-32715

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Patches & Fixes for CVE-2021-32715 (1)

Vendor Advisories for CVE-2021-32715 (1)

IV. Related Vulnerabilities

Same product: hyper
Same vendor: hyperium
Same weakness: CWE-444

V. Comments for CVE-2021-32715

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