ghsa-66pp-5p9w-q87j
Vulnerability from github
Published
2025-03-26 14:54
Modified
2025-03-26 14:54
Severity ?
2.1 (Low) - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
Summary
Shescape has potential environment variable exposure on Windows with CMD
Details

Impact

This impact users of Shescape on Windows that explicitly configure shell: 'cmd.exe' or shell: true using any of quote/quoteAll/escape/escapeAll.

An attacker may be able to get read-only access to environment variables. Example:

```javascript import * as cp from "node:child_process"; import { Shescape } from "shescape";

// 1. Prerequisites const shescape = new Shescape({ shell: "cmd.exe", // Or shell: true, // Only if the default shell is CMD });

// 2. Payload const payload = '"%PATH%';

// 3. Usage let escapedPayload;

escapedPayload = shescape.quote(payload); // Or escapedPayload = shescape.quoteAll([payload]); // Or escapedPayload = shescape.escape(payload); // Or escapedPayload = shescape.escapeAll([payload]);

// And (example) const result = cp.execSync(echo Hello ${escapedPayload}, options);

// 4. Impact console.log(result.toString()); // Outputs "Hello" followed by the contents of the PATH environment variable ```

For Shescape prior to v2.0.0, the options object must have shell: 'cmd.exe' or shell: undefined and interpolation: true.

Patches

This bug has been patched in v2.1.2 which you can upgrade to now.

If you are already using v2 of Shescape, no further changes are required. If you are using v1 of Shescape, follow the migration guide to upgrade to v2. There is no plan to release a patch compatible with v1 of Shescape.

Workarounds

Alternatively, users can remove all instances of % from user input before using Shescape.

References

For more information

Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "shescape"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.7.2"
            },
            {
              "fixed": "2.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-30222"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-26T14:54:22Z",
    "nvd_published_at": "2025-03-25T23:15:36Z",
    "severity": "LOW"
  },
  "details": "### Impact\n\nThis impact users of Shescape on Windows that explicitly configure `shell: \u0027cmd.exe\u0027` or `shell: true` using any of `quote`/`quoteAll`/`escape`/`escapeAll`.\n\nAn attacker may be able to get read-only access to environment variables. Example:\n\n```javascript\nimport * as cp from \"node:child_process\";\nimport { Shescape } from \"shescape\";\n\n// 1. Prerequisites\nconst shescape = new Shescape({\n    shell: \"cmd.exe\",\n    // Or\n    shell: true, // Only if the default shell is CMD\n});\n\n// 2. Payload\nconst payload = \u0027\"%PATH%\u0027;\n\n// 3. Usage\nlet escapedPayload;\n\nescapedPayload = shescape.quote(payload);\n// Or\nescapedPayload = shescape.quoteAll([payload]);\n// Or\nescapedPayload = shescape.escape(payload);\n// Or\nescapedPayload = shescape.escapeAll([payload]);\n\n// And (example)\nconst result = cp.execSync(`echo Hello ${escapedPayload}`, options);\n\n// 4. Impact\nconsole.log(result.toString());\n// Outputs \"Hello\" followed by the contents of the PATH environment variable\n```\n\nFor Shescape prior to v2.0.0, the `options` object must have `shell: \u0027cmd.exe\u0027` or `shell: undefined` and `interpolation: true`.\n\n\n### Patches\n\nThis bug has been patched in [v2.1.2](https://github.com/ericcornelissen/shescape/releases/tag/v2.1.2) which you can upgrade to now.\n\nIf you are already using v2 of Shescape, no further changes are required. If you are using v1 of Shescape, follow the [migration guide](https://github.com/ericcornelissen/shescape/blob/155b13b4141750203ce71249f1b0fdc638c7a0d0/docs/migration.md) to upgrade to v2. There is no plan to release a patch compatible with v1 of Shescape.\n\n\n### Workarounds\n\nAlternatively, users can remove all instances of % from user input before using Shescape.\n\n\n### References\n\n- Shescape Pull Request [#1916](https://github.com/ericcornelissen/shescape/pull/1916)\n- Shescape commit [0a81f1e](https://github.com/ericcornelissen/shescape/commit/0a81f1eb077bab8caae283a2490cd7be9af179c6)\n- Shescape release [v2.1.2](https://github.com/ericcornelissen/shescape/releases/tag/v2.1.2)\n\n\n### For more information\n\n- Comment on Pull Request [#1916](https://github.com/ericcornelissen/shescape/pull/1916)\n- Comment on commit [0a81f1e](https://github.com/ericcornelissen/shescape/commit/0a81f1eb077bab8caae283a2490cd7be9af179c6)\n- Open an issue at [https://github.com/ericcornelissen/shescape/issues](https://github.com/ericcornelissen/shescape/issues) (New issue \u003e Question)",
  "id": "GHSA-66pp-5p9w-q87j",
  "modified": "2025-03-26T14:54:22Z",
  "published": "2025-03-26T14:54:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/security/advisories/GHSA-66pp-5p9w-q87j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-30222"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/pull/1916"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/commit/0a81f1eb077bab8caae283a2490cd7be9af179c6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ericcornelissen/shescape"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ericcornelissen/shescape/releases/tag/v2.1.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Shescape has potential environment variable exposure on Windows with CMD"
}


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