{"id":"GHSA-vvmv-wrvp-9gjr","summary":"@jmondi/url-to-png contains a Path Traversal vulnerability","details":"### Summary\nWhen trying to add a `BLOCK_LIST` feature when the maintainer noticed they didn't sanitize the `ImageId` in the code, which leads to path traversal vulnerability. Now, this is different from a traditional path traversal issue, because as of NOW you can store the image in any place arbitrarily, and given enough time they might be able to come up with a working exploit BUT for the time being they am reporting this.  \n\n### Details\n\n@jmondi/url-to-png does not sanitizing the `ImageID` as in not removing special chars from the params [(extract_query_params.ts#l75)](https://github.com/jasonraimondi/url-to-png/blob/e43098e0af3a380ebc044e7f303a83933b94b434/src/middlewares/extract_query_params.ts#L75)\n\n```js\nconst imageId = dateString + \".\" + slugify(validData.url) +configToString(params);\n```\n\nThis when fed to other parts of the code such as ([filesystem.ts#L34](https://github.com/jasonraimondi/url-to-png/blob/8afc00247c1d7e6c7b37356a5f6282b486e596fa/src/lib/storage/filesystem.ts#L34))\n\n```js\nreturn path.join(this.storagePath, imageId) + \".png\";\n```\n\nWould result in path traversal issue. \n\n### PoC\n\n```\n# Configuration for filesystem storage provider (optional)\nSTORAGE_PROVIDER=filesystem\nIMAGE_STORAGE_PATH=poc\n```\n\nSet this in your `.env` file and use this as your payload. \n\n```\nhttp://localhost:3089/?url=http://example.com&width=400&isDarkMode=../../../../../../../../../../../../tmp/hack\n```\n\nThis will create a `.png` file in the `/tmp` section of the system.\n\nLoom POC: https://www.loom.com/share/bd7b306cdae7445c97e68f0626e743a6 \n\n\n\nThis is valid for pretty much all the arguments (except for numeric values)\n\nA simple fix would be to use the `slugify` for the params as well like so ([#L75](https://github.com/jasonraimondi/url-to-png/blob/e43098e0af3a380ebc044e7f303a83933b94b434/src/middlewares/extract_query_params.ts#L75))\n\n```diff\n- const imageId = dateString + \".\" + slugify(validData.url) + configToString(params);\n+ const imageId = dateString + \".\" + slugify(validData.url) + slugify(configToString(params));\n```\n\n\n### Impact\nThis would be path traversal vulnerability which allows arbitrary write as of now. \n","aliases":["CVE-2024-39918"],"modified":"2026-09-10T03:50:16.990096613Z","published":"2024-07-15T17:46:57Z","database_specific":{"cwe_ids":["CWE-22"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2024-07-15T17:46:57Z","nvd_published_at":"2024-07-15T20:15:04Z"},"references":[{"type":"WEB","url":"https://github.com/jasonraimondi/url-to-png/security/advisories/GHSA-vvmv-wrvp-9gjr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39918"},{"type":"WEB","url":"https://github.com/jasonraimondi/url-to-png/commit/e4eaeca6493b21cd515b582fd6c0af09ede54507"},{"type":"PACKAGE","url":"https://github.com/jasonraimondi/url-to-png"},{"type":"WEB","url":"https://github.com/jasonraimondi/url-to-png/blob/e43098e0af3a380ebc044e7f303a83933b94b434/src/middlewares/extract_query_params.ts#L75"},{"type":"WEB","url":"https://github.com/jasonraimondi/url-to-png/releases/tag/v2.1.2"}],"affected":[{"package":{"name":"@jmondi/url-to-png","ecosystem":"npm","purl":"pkg:npm/%40jmondi/url-to-png"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/07/GHSA-vvmv-wrvp-9gjr/GHSA-vvmv-wrvp-9gjr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}