GHSA-C8XP-8MF3-62H9

Vulnerability from github – Published: 2021-09-07 23:02 – Updated: 2021-09-03 21:40
VLAI?
Summary
OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values
Details

Any CA issuer in the RPKI can trick OctoRPKI prior to https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422 into emitting an invalid VRP "MaxLength" value, causing RTR sessions to terminate.

Impact

An attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as "RPKI invalid". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.

Patches

https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422

https://github.com/cloudflare/cfrpki/releases/tag/v1.3.0

For more information

If you have any questions or comments about this advisory: * Email us at security@cloudflare.com

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/cloudflare/cfrpki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-3761"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295",
      "CWE-787"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-09-03T21:40:39Z",
    "nvd_published_at": "2021-09-09T14:15:00Z",
    "severity": "HIGH"
  },
  "details": "Any CA issuer in the RPKI can trick OctoRPKI prior to https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422 into emitting an invalid VRP \"MaxLength\" value, causing RTR sessions to terminate. \n\n### Impact\n\nAn attacker can use this to disable RPKI Origin Validation in a victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal operations would be rejected as \"RPKI invalid\". Additionally, in certain deployments RTR session flapping in and of itself also could cause BGP routing churn, causing availability issues.\n\n### Patches\nhttps://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422\n\nhttps://github.com/cloudflare/cfrpki/releases/tag/v1.3.0\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email us at [security@cloudflare.com](security@cloudflare.com)\n",
  "id": "GHSA-c8xp-8mf3-62h9",
  "modified": "2021-09-03T21:40:39Z",
  "published": "2021-09-07T23:02:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cloudflare/cfrpki/security/advisories/GHSA-c8xp-8mf3-62h9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3761"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cloudflare/cfrpki/pull/90"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cloudflare/cfrpki/commit/a8db4e009ef217484598ba1fd1c595b54e0f6422"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cloudflare/cfrpki/releases/tag/v1.3.0"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2022-0246"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2022/dsa-5041"
    },
    {
      "type": "PACKAGE",
      "url": "github.com/cloudflare/cfrpki"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OctoRPKI lacks contextual out-of-bounds check when validating RPKI ROA maxLength values"
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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