github - ghsa-5h46-h7hh-c6x9

GHSA-5H46-H7HH-C6X9

Vulnerability from github – Published: 2021-07-12 16:55 – Updated: 2021-09-07 21:47

Summary

Integer Overflow in Chunked Transfer-Encoding

Details

Summary

hyper's HTTP server and client code had a flaw that could trigger an integer overflow when decoding chunk sizes that are too big. This allows possible data loss, or if combined with an upstream HTTP proxy that allows chunk sizes larger than hyper does, can result in "request smuggling" or "desync attacks".

Vulnerability

Example:

GET / HTTP/1.1
Host: example.com
Transfer-Encoding: chunked

f0000000000000003
abc
0

hyper only reads the rightmost 64-bit integer as the chunk size. So it reads f0000000000000003 as 3. A loss of data can occur since hyper would then read only 3 bytes of the body. Additionally, an HTTP request smuggling vulnerability would occur if using a proxy which instead has prefix truncation in the chunk size, or that understands larger than 64-bit chunk sizes.

Read more about desync attacks: https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn

Impact

To determine if vulnerable to data loss, these things must be true:

Using HTTP/1.1. Since HTTP/2 does not use chunked encoding, it is not vulnerable.
Using hyper as a server or client. The body would be improperly truncated in either case.
Users send requests or responses with chunk sizes greater than 18 exabytes.

To determine if vulnerable to desync attacks, these things must be true:

Using an upstream proxy that allows chunks sizes larger than 64-bit. If the proxy rejects chunk sizes that are too large, that request won't be forwarded to hyper.

Patches

We have released the following patch versions:

v0.14.10 (to be released when this advisory is published)

Workarounds

Besides upgrading hyper, you can take the following options:

Reject requests manually that contain a Transfer-Encoding header.
Ensure any upstream proxy rejects Transfer-Encoding chunk sizes greater than what fits in 64-bit unsigned integers.

Credits

This issue was initially reported by Mattias Grenfeldt and Asta Olofsson.

Severity ?

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "hyper"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.14.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-32714"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-07-07T20:05:15Z",
    "nvd_published_at": "2021-07-07T20:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nhyper\u0027s HTTP server and client code had a flaw that could trigger an integer overflow when decoding chunk sizes that are too big. This allows possible data loss, or if combined with an upstream HTTP proxy that allows chunk sizes larger than hyper does, can result in \"request smuggling\" or \"desync attacks\".\n\n### Vulnerability\n\nExample:\n\n```\nGET / HTTP/1.1\nHost: example.com\nTransfer-Encoding: chunked\n\nf0000000000000003\nabc\n0\n\n```\n\nhyper only reads the rightmost 64-bit integer as the chunk size. So it reads `f0000000000000003` as `3`. A loss of data can occur since hyper would then read only 3 bytes of the body. Additionally, an HTTP request smuggling vulnerability would occur if using a proxy which instead has prefix truncation in the chunk size, or that understands larger than 64-bit chunk sizes.\n\nRead more about desync attacks: https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn\n\n### Impact\n\nTo determine if vulnerable to _data loss_, these things must be true:\n\n- **Using HTTP/1.1.** Since HTTP/2 does not use chunked encoding, it is not vulnerable.\n- **Using hyper as a server or client.** The body would be improperly truncated in either case.\n- **Users send requests or responses with chunk sizes greater than 18 exabytes**.\n\nTo determine if vulnerable to _desync attacks_, these things must be true:\n\n- **Using an upstream proxy that allows chunks sizes larger than 64-bit.** If the proxy rejects chunk sizes that are too large, that request won\u0027t be forwarded to hyper.\n\n### Patches\n\nWe have released the following patch versions:\n\n - v0.14.10 (to be released when this advisory is published)\n\n### Workarounds\n\nBesides upgrading hyper, you can take the following options:\n\n- Reject requests manually that contain a `Transfer-Encoding` header.\n- Ensure any upstream proxy rejects `Transfer-Encoding` chunk sizes greater than what fits in 64-bit unsigned integers.\n\n\n### Credits\nThis issue was initially reported by [Mattias Grenfeldt](https://grenfeldt.dev/) and Asta Olofsson.",
  "id": "GHSA-5h46-h7hh-c6x9",
  "modified": "2021-09-07T21:47:36Z",
  "published": "2021-07-12T16:55:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hyperium/hyper/security/advisories/GHSA-5h46-h7hh-c6x9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32714"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hyperium/hyper"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0079.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Integer Overflow in Chunked Transfer-Encoding"
}

CVE-2021-32714 (GCVE-0-2021-32714)

Vulnerability from cvelistv5 – Published: 2021-07-07 19:35 – Updated: 2024-08-03 23:25

Summary

hyper is an HTTP library for Rust. In versions prior to 0.14.10, hyper's HTTP server and client code had a flaw that could trigger an integer overflow when decoding chunk sizes that are too big. This allows possible data loss, or if combined with an upstream HTTP proxy that allows chunk sizes larger than hyper does, can result in "request smuggling" or "desync attacks." The vulnerability is patched in version 0.14.10. Two possible workarounds exist. One may reject requests manually that contain a `Transfer-Encoding` header or ensure any upstream proxy rejects `Transfer-Encoding` chunk sizes greater than what fits in 64-bit unsigned integers.

Severity ?

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

URL

Tags

https://github.com/hyperium/hyper/security/adviso…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	hyperium	hyper	Affected: < 0.14.10

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-5H46-H7HH-C6X9

Summary

Vulnerability

Impact

Patches

Workarounds

Credits

CVE-2021-32714 (GCVE-0-2021-32714)

Tags

Sightings

Nomenclature