GHSA-c29q-5xm7-5p62 — StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized service name in exception text

StarCitizenWiki Extension Embed Video: Stored XSS via unsanitized service name in exception text

The advisory, in context

Summary

When passing an unknown service name to embedvideo, an error message is rendered containing the invalid service name. The service name is not sanitized and can contain HTML.

Details

There is a hardcoded list of allowed services in a switch statement inside EmbedServiceFactory#newFromName here. When the service name is not known, an exception is thrown with the service name injected into the message via sprintf here. This message is not sanitized and is marked as isHtml here. Similarly with {{evl: here.

PoC

// Must be on a page, not on ExpandTemplates
{{#ev:<img src=x onerror=alert(document.domain)>|dQw4w9WgXcQ}}
{{#evl:id=dummy|service=<img src=x onerror=alert(document.domain)>}}

Impact

Stored XSS that allows arbitrary Javascript/HTML insertion on any page that a user can edit. It requires no interaction and executes in the wiki origin for every visitor to the page.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

starcitizenwiki/embedvideo Packagist

Ecosystem versions

Earlier releases before 4.1.0

Fixed in 4.1.0

26 explicitly affected versions

3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.1.0, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.2.7, 3.2.8, 3.3.0, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 4.0.0

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "0"
        },
        {
          "fixed": "4.1.0"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "3.0.0",
    "3.0.1",
    "3.0.2",
    "3.0.3",
    "3.0.4",
    "3.0.5",
    "3.0.6",
    "3.0.7",
    "3.0.8",
    "3.0.9",
    "3.1.0",
    "3.2.0",
    "3.2.1",
    "3.2.2",
    "3.2.3",
    "3.2.4",
    "3.2.5",
    "3.2.6",
    "3.2.7",
    "3.2.8",
    "3.3.0",
    "3.4.0",
    "3.4.1",
    "3.4.2",
    "3.4.3",
    "4.0.0"
  ]
}

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