GHSA-v65j-hff3-753c — Mediawiki EmbedVideo Extension has stored XSS via malformed src url with $wgEmbedVideoRequireConsent disabled

Mediawiki EmbedVideo Extension has stored XSS via malformed src url with $wgEmbedVideoRequireConsent disabled

The advisory, in context

Summary

With $wgEmbedVideoRequireConsent disabled (not the default), the urls for videos are passed into an iframe src attribute without sanitization. When given a malformed url or id, the src attribute can be escaped via double quotes, allowing for html/javascript injection.

Details

The iframe assembled here adds the url from getUrl() as the src without sanitization. The id regex for the archiveorg service and the url regexes for the wistia and sharepoint services allow for double quotes to be introduced.

PoC

Using double quotes, the src attribute can be escaped.

<embedvideo service="archiveorg" id='a" onmouseover="alert(document.domain)" data-x="'></embedvideo>

Impact

When $wgEmbedVideoRequireConsent = false, any user able to edit a page can inject arbitrary JavaScript into an HTML event handler attribute (e.g. onfocus) via parameter. It requires no interaction (autofires via autofocus) 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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