GHSA-P493-635Q-R6GR

Vulnerability from github – Published: 2021-03-03 02:03 – Updated: 2025-04-16 22:09
VLAI?
Summary
Remote code execution via the `pretty` option.
Details

Impact

If a remote attacker was able to control the pretty option of the pug compiler, e.g. if you spread a user provided object such as the query parameters of a request into the pug template inputs, it was possible for them to achieve remote code execution on the node.js backend.

Patches

Upgrade to pug@3.0.1 or pug-code-gen@3.0.2 or pug-code-gen@2.0.3, which correctly sanitise the parameter.

Workarounds

If there is no way for un-trusted input to be passed to pug as the pretty option, e.g. if you compile templates in advance before applying user input to them, you do not need to upgrade.

References

Original report: https://github.com/pugjs/pug/issues/3312

For more information

If you believe you have found other vulnerabilities, please DO NOT open an issue. Instead, you can follow the instructions in our Security Policy

Severity ?
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "pug"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "pug-code-gen"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "pug-code-gen"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-21353"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-74",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-03-03T01:49:22Z",
    "nvd_published_at": "2021-03-03T02:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nIf a remote attacker was able to control the `pretty` option of the pug compiler, e.g. if you spread a user provided object such as the query parameters of a request into the pug template inputs, it was possible for them to achieve remote code execution on the node.js backend.\n\n### Patches\n\nUpgrade to `pug@3.0.1` or `pug-code-gen@3.0.2` or `pug-code-gen@2.0.3`, which correctly sanitise the parameter.\n\n### Workarounds\n\nIf there is no way for un-trusted input to be passed to pug as the `pretty` option, e.g. if you compile templates in advance before applying user input to them, you do not need to upgrade.\n\n### References\n\n\nOriginal report: https://github.com/pugjs/pug/issues/3312\n\n### For more information\n\nIf you believe you have found other vulnerabilities, please **DO NOT** open an issue. Instead, you can follow the instructions in our [Security Policy](https://github.com/pugjs/pug/blob/master/SECURITY.md)",
  "id": "GHSA-p493-635q-r6gr",
  "modified": "2025-04-16T22:09:45Z",
  "published": "2021-03-03T02:03:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6gr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21353"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pugjs/pug/issues/3312"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pugjs/pug/pull/3314"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pugjs/pug/releases/tag/pug%403.0.1"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/pug"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/pug-code-gen"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Remote code execution via the `pretty` option."
}


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  • 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.



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