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Medium

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-15237

In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisory.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-15237
Confirmed fixed CVEs
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Updated in this feed
31 Oct 2026, 10:54 UTC · Revision 1

Source evidence

CVE-2020-15237

core-osv · Original source

Published 5 Oct 2020, 19:15 UTC

In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisory.

osv:CVE-2020-15237
Complete source record
{
  "id": "6be07555ea1c0028a94fada7ddb98be528bb0749bcc220f7df270951492ede12",
  "url": "https://osv.dev/vulnerability/CVE-2020-15237",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15237",
    "summary": "In Shrine before version 3.3.0, when using the `derivation_endpoint` plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL. The problem has been fixed by comparing sent and calculated signature in constant time, using `Rack::Utils.secure_compare`. Users using the `derivation_endpoint` plugin are urged to upgrade to Shrine 3.3.0 or greater. A possible workaround is provided in the linked advisory.",
    "evidence": "osv:CVE-2020-15237",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-15237",
      "aliases": [
        "CVE-2020-15237",
        "GHSA-5jjv-x4fq-qjwp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/shrinerb/shrine",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c195329ab48d011010b06a6062d888744ceb3be0"
                },
                {
                  "fixed": "1b27090ce31543bf39f186c20ea47c8250fca2f0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:shrinerb:shrine:*:*:*:*:*:ruby:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.3.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1b27090ce31543bf39f186c20ea47c8250fca2f0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.2.1",
            "v3.2.0",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v3.0.0.rc",
            "v3.0.0.beta3",
            "v3.0.0.beta2",
            "v3.0.0.beta",
            "v3.0.0.alpha",
            "v2.19.0",
            "v2.18.0",
            "v2.17.1",
            "v2.17.0",
            "v2.16.0",
            "v2.15.0",
            "v2.14.0",
            "v2.13.0",
            "v2.12.0",
            "v2.11.0",
            "v2.10.0",
            "v2.9.0",
            "v2.8.0",
            "v2.7.0",
            "v2.6.1",
            "v2.6.0",
            "v2.5.0",
            "v2.4.1",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.0",
            "v2.1.1",
            "v2.1.0",
            "v2.0.1",
            "v2.0.0",
            "v1.4.2",
            "v1.4.1",
            "v1.4.0",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0",
            "v0.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15237.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:00.117109592Z",
      "provider": "osv",
      "references": [
        "https://github.com/shrinerb/shrine/security/advisories/GHSA-5jjv-x4fq-qjwp",
        "https://github.com/shrinerb/shrine/commit/1b27090ce31543bf39f186c20ea47c8250fca2f0"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-15237",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383196,
  "published_at": "2020-10-05T19:15:15.103+00:00"
}