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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hyper | Hyper | < 0.14.10 |
Related Weaknesses (CWE)
References
- https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99cExploitThird Party Advisory
- https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74PatchThird Party Advisory
- https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99cExploitThird Party Advisory
- https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74PatchThird Party Advisory
FAQ
What is CVE-2021-32715?
CVE-2021-32715 is a vulnerability with a CVSS score of 3.1 (LOW). 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...
How severe is CVE-2021-32715?
CVE-2021-32715 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32715?
Check the references section above for vendor advisories and patch information. Affected products include: Hyper Hyper.