rustsec-2022-0014
Vulnerability from osv_rustsec
Published
2022-03-15 12:00
Modified
2023-06-13 13:10
Summary
Infinite loop in `BN_mod_sqrt()` reachable when parsing certificates
Details

The BN_mod_sqrt() function, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli.

Internally this function is used when parsing certificates that contain elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form.

It is possible to trigger the infinite loop by crafting a certificate that has invalid explicit curve parameters.

Since certificate parsing happens prior to verification of the certificate signature, any process that parses an externally supplied certificate may thus be subject to a denial of service attack. The infinite loop can also be reached when parsing crafted private keys as they can contain explicit elliptic curve parameters.

Thus vulnerable situations include:

  • TLS clients consuming server certificates
  • TLS servers consuming client certificates
  • Hosting providers taking certificates or private keys from customers
  • Certificate authorities parsing certification requests from subscribers
  • Anything else which parses ASN.1 elliptic curve parameters

Also any other applications that use the BN_mod_sqrt() where the attacker can control the parameter values are vulnerable to this DoS issue.

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "denial-of-service"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "openssl-src",
        "purl": "pkg:cargo/openssl-src"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "111.18.0"
            },
            {
              "introduced": "300.0.0"
            },
            {
              "fixed": "300.0.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2022-0778",
    "GHSA-x3mh-jvjw-3xwx"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The `BN_mod_sqrt()` function, which computes a modular square root, contains\na bug that can cause it to loop forever for non-prime moduli.\n\nInternally this function is used when parsing certificates that contain\nelliptic curve public keys in compressed form or explicit elliptic curve\nparameters with a base point encoded in compressed form.\n\nIt is possible to trigger the infinite loop by crafting a certificate that\nhas invalid explicit curve parameters.\n\nSince certificate parsing happens prior to verification of the certificate\nsignature, any process that parses an externally supplied certificate may thus\nbe subject to a denial of service attack. The infinite loop can also be\nreached when parsing crafted private keys as they can contain explicit\nelliptic curve parameters.\n\nThus vulnerable situations include:\n\n - TLS clients consuming server certificates\n - TLS servers consuming client certificates\n - Hosting providers taking certificates or private keys from customers\n - Certificate authorities parsing certification requests from subscribers\n - Anything else which parses ASN.1 elliptic curve parameters\n\nAlso any other applications that use the `BN_mod_sqrt()` where the attacker\ncan control the parameter values are vulnerable to this DoS issue.",
  "id": "RUSTSEC-2022-0014",
  "modified": "2023-06-13T13:10:24Z",
  "published": "2022-03-15T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/openssl-src"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2022-0014.html"
    },
    {
      "type": "WEB",
      "url": "https://www.openssl.org/news/secadv/20220315.txt"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Infinite loop in `BN_mod_sqrt()` reachable when parsing certificates"
}


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