{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "jsii"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.7.0"
            },
            {
              "fixed": "5.7.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "jsii"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.6.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "jsii"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.5.0"
            },
            {
              "fixed": "5.5.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "jsii"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.4.0"
            },
            {
              "fixed": "5.4.46"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-12-18T15:50:09Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "## Summary\n\n`jsii` is a TypeScript to JavaScript compiler that also extracts an interface definition manifest to generate RPC stubs in various programming languages. jsii is typically used as a command-line tool, but it can also be loaded as a library.\nWhen loaded as a library into a larger application, prototype pollution may happen if untrusted user input is passed to the library. When used as a command line-tool, this pollution cannot occur.\n\n## Impact\n\nYou may be impacted if you have written an application that loads jsii as a library, and passes untrusted user input into the `jsii.configureCategories()` function. In that case, a user can craft input in such a way that, following the invocation, a field named \"category\" with a user-controlled value is added to the JavaScript Object prototype. This will cause every object in the program (both new and existing) to have a field named \"category\", even if it shouldn\u0027t. \n\n**This will not affect jsii itself, but it might affect the application you have loaded jsii into.**\n\n\u003e The function `jsii.configureCategories()` is used to configure the severity (error, warning, etc.) of various jsii diagnostics.\n\n**Impacted versions: \u003c=5.7.2, \u003c=5.6.3, \u003c=5.5.14, \u003c=5.4.45** \n\n**Example:**\n\n```js\nconst jsii = require(\u0027jsii\u0027);\n\n// prints \u0027undefined\u0027\nconsole.log(JSON.stringify({}.category))\n\n// calling \u0027configureCategories\u0027 with user input\njsii.configureCategories(JSON.parse(\u0027{\"__proto__\": \"user-input\"}\u0027))\n\n// from this point onwards, every single object literal in the program\n// will contain the \u0027category\u0027 key, with user controlled value\nconsole.log(JSON.stringify({}.category)) // prints \u0027user-input\u0027\n\n\n// this can affect the execution of the main program in case it also makes \n// use of an object key called \u0027category\u0027. for example, if the main programs \n// happens to have code like this:\n\nconst x = {} // some object in the main program (not necessarily empty)\n\nif (x.category) {\n  // this block will always be executed, effectively \n  // changing the behavior of the main program.\n  console.log(\u0027Do something\u0027)\n} else {\n  console.log(\u0027Do something else\u0027)\n}\n```\n\nFor more information about javascript prototype pollution, see [1].\n\n## Patches\n\nA patch is included in versions [5.7.3](https://github.com/aws/jsii-compiler/releases/tag/v5.7.3), [5.6.4](https://github.com/aws/jsii-compiler/releases/tag/v5.6.4), [5.5.15](https://github.com/aws/jsii-compiler/releases/tag/v5.5.15), [5.4.46](https://github.com/aws/jsii-compiler/releases/tag/v5.4.46)\n\n## Workarounds\n\nSanitize user input to configureCategories() by stripping the __proto__ property if detected.\n\n## References\n\nIf you have any questions or comments about this advisory, we ask that you contact AWS/Amazon Security via our issue reporting page [2] or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n[1] https://learn.snyk.io/lesson/prototype-pollution/\n\n[2] [https://aws.amazon.com/security/issue-reporting](https://aws.amazon.com/security/vulnerability-reporting)\n\n## Credits\n\nWe would like to thank _Tariq Hawis_ for collaborating on this issue through the coordinated vulnerability disclosure process.",
  "id": "GHSA-m56h-5xx3-2jc2",
  "modified": "2025-01-07T15:12:20Z",
  "published": "2024-12-18T15:50:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aws/jsii-compiler/security/advisories/GHSA-m56h-5xx3-2jc2"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aws/jsii-compiler"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aws/jsii-compiler/releases/tag/v5.4.46"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aws/jsii-compiler/releases/tag/v5.5.15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aws/jsii-compiler/releases/tag/v5.6.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aws/jsii-compiler/releases/tag/v5.7.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Prototype pollution in jsii.configureCategories"
}