ubuntu-cve-2021-32715
Vulnerability from osv_ubuntu
Published
2021-07-07 20:15
Modified
2025-10-24 04:50
Summary
Details

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.

Severity
3.1 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-hyper+default-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+futures-cpupool-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+net2-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+runtime-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-executor-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-reactor-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-tcp-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-threadpool-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-timer-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper-dev",
            "binary_version": "0.12.35-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "rust-hyper",
        "purl": "pkg:deb/ubuntu/rust-hyper@0.12.35-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.12.35-1"
      ]
    }
  ],
  "aliases": [],
  "details": "hyper is an HTTP library for rust. hyper\u0027s 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\u0027t 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.",
  "id": "UBUNTU-CVE-2021-32715",
  "modified": "2025-10-24T04:50:20Z",
  "published": "2021-07-07T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-32715"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739"
    },
    {
      "type": "REPORT",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0078.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-32715"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-32715"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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