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cve.new
GHSA-9ff2-p842-45wqlow3.5

Contao: Cross-site request forgery in custom backend actions

Check your stack

The advisory, in context

RequestTokenListener is the only generic REQUEST_TOKEN validator in Contao and it only runs on POST. On the GET side the guard is local and declarative, and it only fires when an act parameter is present. Every back end action dispatched through a different parameter therefore has no CSRF protection at all. This is a family rather than a single bug.

Impact

An attacker who gets a logged in back end user to load a URL performs back end actions as that user, with no token and no confirmation. Because the exposure follows from the dispatch mechanism rather than from one callback, every present and future key= action inherits it.

Honest bound. The victim must be authenticated in the back end and must load the URL, and the reachable actions are limited to the modules that user can access. We have not found a key= action that grants privileges; the ones we verified are destructive or state changing rather than escalating.

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

From 4.0.0 before 5.3.50

Fixed in 5.3.50

397 explicitly affected versions

4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1.0, 4.1.0-RC1, 4.1.0-beta1, 4.1.1, 4.1.2, 4.1.3, 4.10.0, 4.10.0-RC1, 4.10.0-RC2, 4.10.0-RC3, 4.10.0-RC4, 4.10.1, 4.10.2, 4.10.3, 4.10.4, 4.10.5, 4.10.6, 4.10.7, 4.11.0, 4.11.0-RC1, 4.11.0-RC2, 4.11.1, 4.11.2, 4.11.3, 4.11.4, 4.11.5, 4.11.6, 4.11.7, 4.11.8, 4.11.9, 4.12.0, 4.12.0-RC1, 4.12.0-RC2, 4.12.0-RC3, 4.12.1, 4.12.2, 4.12.3, 4.12.4, 4.12.5, 4.12.6, 4.12.7, 4.13.0, 4.13.0-RC1, 4.13.0-RC2, 4.13.0-RC3, 4.13.1, 4.13.10, 4.13.11, 4.13.12, 4.13.13, 4.13.14, 4.13.15, 4.13.16, 4.13.17, 4.13.18, 4.13.19, 4.13.2, 4.13.20, 4.13.21, 4.13.22, 4.13.23, 4.13.24, 4.13.25, 4.13.26, 4.13.27, 4.13.28, 4.13.29, 4.13.3, 4.13.30, 4.13.31, 4.13.32, 4.13.33, 4.13.34, 4.13.35, 4.13.36, 4.13.37, 4.13.38, 4.13.39, 4.13.4, 4.13.40, 4.13.41, 4.13.42, 4.13.43, 4.13.44, 4.13.45, 4.13.46, 4.13.47, 4.13.48, 4.13.49, 4.13.5, 4.13.50, 4.13.51, 4.13.52, 4.13.53, 4.13.54, 4.13.55, 4.13.56, 4.13.57, 4.13.58, 4.13.6, 4.13.7, 4.13.8, 4.13.9, 4.2.0, 4.2.0-RC1, 4.2.0-beta1, 4.2.1, 4.2.2, 4.2.3, 4.2.4, 4.2.5, 4.3.0, 4.3.0-RC1, 4.3.1, 4.3.10, 4.3.11, 4.3.2, 4.3.3, 4.3.4, 4.3.5, 4.3.6, 4.3.7, 4.3.8, 4.3.9, 4.4.0, 4.4.0-RC1, 4.4.0-RC2, 4.4.0-beta1, 4.4.1, 4.4.10, 4.4.11, 4.4.12, 4.4.13, 4.4.14, 4.4.15, 4.4.16, 4.4.17, 4.4.18, 4.4.19, 4.4.2, 4.4.20, 4.4.21, 4.4.22, 4.4.23, 4.4.24, 4.4.25, 4.4.26, 4.4.27, 4.4.28, 4.4.29, 4.4.3, 4.4.30, 4.4.31, 4.4.32, 4.4.33, 4.4.34, 4.4.35, 4.4.36, 4.4.37, 4.4.38, 4.4.39, 4.4.4, 4.4.40, 4.4.41, 4.4.42, 4.4.43, 4.4.44, 4.4.45, 4.4.46, 4.4.47, 4.4.48, 4.4.49, 4.4.5, 4.4.50, 4.4.51, 4.4.52, 4.4.53, 4.4.54, 4.4.55, 4.4.56, 4.4.57, 4.4.6, 4.4.7, 4.4.8, 4.4.9, 4.5.0, 4.5.0-RC1, 4.5.0-RC2, 4.5.0-beta1, 4.5.0-beta2, 4.5.0-beta3, 4.5.1, 4.5.10, 4.5.11, 4.5.12, 4.5.13, 4.5.14, 4.5.2, 4.5.3, 4.5.4, 4.5.5, 4.5.6, 4.5.7, 4.5.8, 4.5.9, 4.6.0, 4.6.0-RC1, 4.6.0-RC2, 4.6.0-RC3, 4.6.1, 4.6.10, 4.6.11, 4.6.12, 4.6.13, 4.6.14, 4.6.2, 4.6.3, 4.6.4, 4.6.5, 4.6.6, 4.6.7, 4.6.8, 4.6.9, 4.7.0, 4.7.0-RC1, 4.7.0-RC2, 4.7.0-RC3, 4.7.0-RC4, 4.7.1, 4.7.2, 4.7.3, 4.7.4, 4.7.5, 4.7.6, 4.7.7, 4.8.0, 4.8.0-RC1, 4.8.0-RC2, 4.8.1, 4.8.2, 4.8.3, 4.8.4, 4.8.5, 4.8.6, 4.8.7, 4.8.8, 4.9.0, 4.9.0-RC1, 4.9.0-RC2, 4.9.1, 4.9.10, 4.9.11, 4.9.12, 4.9.13, 4.9.14, 4.9.15, 4.9.16, 4.9.17, 4.9.18, 4.9.19, 4.9.2, 4.9.20, 4.9.21, 4.9.22, 4.9.23, 4.9.24, 4.9.25, 4.9.26, 4.9.27, 4.9.28, 4.9.29, 4.9.3, 4.9.30, 4.9.31, 4.9.32, 4.9.33, 4.9.34, 4.9.35, 4.9.36, 4.9.37, 4.9.38, 4.9.39, 4.9.4, 4.9.40, 4.9.41, 4.9.42, 4.9.5, 4.9.6, 4.9.7, 4.9.8, 4.9.9, 5.0.0, 5.0.0-RC1, 5.0.0-RC2, 5.0.0-RC3, 5.0.0-RC4, 5.0.1, 5.0.10, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9, 5.1.0, 5.1.0-RC1, 5.1.0-RC2, 5.1.0-RC3, 5.1.1, 5.1.10, 5.1.11, 5.1.2, 5.1.3, 5.1.4, 5.1.5, 5.1.6, 5.1.7, 5.1.8, 5.1.9, 5.2.0, 5.2.0-RC1, 5.2.0-RC2, 5.2.0-RC3, 5.2.0-RC4, 5.2.0-RC5, 5.2.0-RC6, 5.2.1, 5.2.10, 5.2.2, 5.2.3, 5.2.4, 5.2.5, 5.2.6, 5.2.7, 5.2.8, 5.2.9, 5.3.0, 5.3.0-RC1, 5.3.0-RC2, 5.3.0-RC3, 5.3.0-RC4, 5.3.1, 5.3.10, 5.3.11, 5.3.12, 5.3.13, 5.3.14, 5.3.15, 5.3.16, 5.3.17, 5.3.18, 5.3.19, 5.3.2, 5.3.20, 5.3.21, 5.3.22, 5.3.23, 5.3.24, 5.3.25, 5.3.26, 5.3.27, 5.3.28, 5.3.29, 5.3.3, 5.3.30, 5.3.31, 5.3.32, 5.3.33, 5.3.34, 5.3.35, 5.3.36, 5.3.37, 5.3.38, 5.3.39, 5.3.4, 5.3.40, 5.3.41, 5.3.42, 5.3.43, 5.3.44, 5.3.45, 5.3.46, 5.3.47, 5.3.48, 5.3.49, 5.3.5, 5.3.6, 5.3.7, 5.3.8, 5.3.9

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "4.0.0"
        },
        {
          "fixed": "5.3.50"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
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    "4.0.1",
    "4.0.2",
    "4.0.3",
    "4.0.4",
    "4.1.0",
    "4.1.0-RC1",
    "4.1.0-beta1",
    "4.1.1",
    "4.1.2",
    "4.1.3",
    "4.10.0",
    "4.10.0-RC1",
    "4.10.0-RC2",
    "4.10.0-RC3",
    "4.10.0-RC4",
    "4.10.1",
    "4.10.2",
    "4.10.3",
    "4.10.4",
    "4.10.5",
    "4.10.6",
    "4.10.7",
    "4.11.0",
    "4.11.0-RC1",
    "4.11.0-RC2",
    "4.11.1",
    "4.11.2",
    "4.11.3",
    "4.11.4",
    "4.11.5",
    "4.11.6",
    "4.11.7",
    "4.11.8",
    "4.11.9",
    "4.12.0",
    "4.12.0-RC1",
    "4.12.0-RC2",
    "4.12.0-RC3",
    "4.12.1",
    "4.12.2",
    "4.12.3",
    "4.12.4",
    "4.12.5",
    "4.12.6",
    "4.12.7",
    "4.13.0",
    "4.13.0-RC1",
    "4.13.0-RC2",
    "4.13.0-RC3",
    "4.13.1",
    "4.13.10",
    "4.13.11",
    "4.13.12",
    "4.13.13",
    "4.13.14",
    "4.13.15",
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    "4.13.19",
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    "4.4.0",
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    "4.5.12",
    "4.5.13",
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    "4.5.2",
    "4.5.3",
    "4.5.4",
    "4.5.5",
    "4.5.6",
    "4.5.7",
    "4.5.8",
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    "4.6.0",
    "4.6.0-RC1",
    "4.6.0-RC2",
    "4.6.0-RC3",
    "4.6.1",
    "4.6.10",
    "4.6.11",
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    "4.7.2",
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    "4.9.16",
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    "5.3.7",
    "5.3.8",
    "5.3.9"
  ]
}
Ecosystem versions

From 5.4.0-RC1 before 5.7.12

Fixed in 5.7.12

71 explicitly affected versions

5.4.0, 5.4.0-RC1, 5.4.0-RC2, 5.4.0-RC3, 5.4.0-RC4, 5.4.1, 5.4.10, 5.4.11, 5.4.12, 5.4.13, 5.4.14, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.4.8, 5.4.9, 5.5.0, 5.5.0-RC1, 5.5.0-RC2, 5.5.0-RC3, 5.5.0-RC4, 5.5.1, 5.5.10, 5.5.11, 5.5.12, 5.5.13, 5.5.14, 5.5.15, 5.5.16, 5.5.2, 5.5.3, 5.5.4, 5.5.5, 5.5.6, 5.5.7, 5.5.8, 5.5.9, 5.6.0, 5.6.0-RC1, 5.6.0-RC2, 5.6.0-RC3, 5.6.1, 5.6.10, 5.6.11, 5.6.2, 5.6.3, 5.6.4, 5.6.5, 5.6.6, 5.6.7, 5.6.8, 5.6.9, 5.7.0, 5.7.0-RC1, 5.7.0-RC2, 5.7.0-RC3, 5.7.0-RC4, 5.7.1, 5.7.10, 5.7.11, 5.7.2, 5.7.3, 5.7.4, 5.7.5, 5.7.6, 5.7.7, 5.7.8, 5.7.9

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "5.4.0-RC1"
        },
        {
          "fixed": "5.7.12"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "5.4.0",
    "5.4.0-RC1",
    "5.4.0-RC2",
    "5.4.0-RC3",
    "5.4.0-RC4",
    "5.4.1",
    "5.4.10",
    "5.4.11",
    "5.4.12",
    "5.4.13",
    "5.4.14",
    "5.4.2",
    "5.4.3",
    "5.4.4",
    "5.4.5",
    "5.4.6",
    "5.4.7",
    "5.4.8",
    "5.4.9",
    "5.5.0",
    "5.5.0-RC1",
    "5.5.0-RC2",
    "5.5.0-RC3",
    "5.5.0-RC4",
    "5.5.1",
    "5.5.10",
    "5.5.11",
    "5.5.12",
    "5.5.13",
    "5.5.14",
    "5.5.15",
    "5.5.16",
    "5.5.2",
    "5.5.3",
    "5.5.4",
    "5.5.5",
    "5.5.6",
    "5.5.7",
    "5.5.8",
    "5.5.9",
    "5.6.0",
    "5.6.0-RC1",
    "5.6.0-RC2",
    "5.6.0-RC3",
    "5.6.1",
    "5.6.10",
    "5.6.11",
    "5.6.2",
    "5.6.3",
    "5.6.4",
    "5.6.5",
    "5.6.6",
    "5.6.7",
    "5.6.8",
    "5.6.9",
    "5.7.0",
    "5.7.0-RC1",
    "5.7.0-RC2",
    "5.7.0-RC3",
    "5.7.0-RC4",
    "5.7.1",
    "5.7.10",
    "5.7.11",
    "5.7.2",
    "5.7.3",
    "5.7.4",
    "5.7.5",
    "5.7.6",
    "5.7.7",
    "5.7.8",
    "5.7.9"
  ]
}

References