GHSA-M2JW-CJ8V-937R

Vulnerability from github – Published: 2025-02-26 20:06 – Updated: 2025-02-26 20:06
VLAI?
Summary
copyparty renders unsanitized filenames as HTML when user uploads empty files
Details

Summary

A DOM-Based XSS was discovered in copyparty, a portable fileserver. The vulnerability is considered low-risk.

Details

By handing someone a maliciously-named file, and then tricking them into dragging the file into copyparty's Web-UI, an attacker could execute arbitrary javascript with the same privileges as that user. For example, this could give unintended read-access to files owned by that user. The bug is triggered by the drag-drop action itself; it is not necessary to actually initiate the upload. The file must be empty (zero bytes).

Note: As a general-purpose webserver, it is intentionally possible to upload HTML-files with arbitrary javascript in <script> tags, which will execute when the file is opened. The difference is that this vulnerability would trigger execution of javascript during the act of uploading, and not when the uploaded file was opened.

Proof of Concept (POC)

  1. Create an empty file named <img src=x onerror="alert(1)">
  2. Drag-and-drop the file into the browser to initiate an upload
  3. The alert(1) is executed
Severity ?
3.6 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "copyparty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.16.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-27145"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79",
      "CWE-83"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-02-26T20:06:56Z",
    "nvd_published_at": "2025-02-25T02:15:16Z",
    "severity": "LOW"
  },
  "details": "## Summary\n\nA [DOM-Based XSS](https://capec.mitre.org/data/definitions/588.html) was discovered in [copyparty](https://github.com/9001/copyparty), a portable fileserver. The vulnerability is considered low-risk.\n\n## Details\n\nBy handing someone a maliciously-named file, and then tricking them into dragging the file into copyparty\u0027s Web-UI, an attacker could execute arbitrary javascript with the same privileges as that user. For example, this could give unintended read-access to files owned by that user. The bug is triggered by the drag-drop action itself; it is not necessary to actually initiate the upload. The file must be empty (zero bytes).\n\nNote: As a general-purpose webserver, it is intentionally possible to upload HTML-files with arbitrary javascript in `\u003cscript\u003e` tags, which will execute when the file is opened. The difference is that this vulnerability would trigger execution of javascript during the act of uploading, and not when the uploaded file was opened.\n\n## Proof of Concept (POC)\n\n1. Create an empty file named `\u003cimg src=x onerror=\"alert(1)\"\u003e`\n2. Drag-and-drop the file into the browser to initiate an upload\n3. The `alert(1)` is executed",
  "id": "GHSA-m2jw-cj8v-937r",
  "modified": "2025-02-26T20:06:56Z",
  "published": "2025-02-26T20:06:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/security/advisories/GHSA-m2jw-cj8v-937r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27145"
    },
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/commit/438ea6ccb06f39d7cbb4b6ee7ad44606e21a63dd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/9001/copyparty"
    },
    {
      "type": "WEB",
      "url": "https://github.com/9001/copyparty/releases/tag/v1.16.15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "copyparty renders unsanitized filenames as HTML when user uploads empty files"
}


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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.
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  • 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.



Detection rules are retrieved from Rulezet.