GHSA-c5c9-8c6m-727vmedium6.1

Cross-Site Scripting via Rich-Text Content

The advisory, in context

Meta

CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC (5.7)

Problem

Failing to properly parse, sanitize and encode malicious rich-text content, the content rendering process in the website frontend is vulnerable to cross-site scripting. Corresponding rendering instructions via TypoScript functionality HTMLparser do not consider all potentially malicious HTML tag & attribute combinations per default.

In addition, the lack of comprehensive default node configuration for rich-text fields in the backend user interface fosters this malfunction.

In default scenarios, a valid backend user account is needed to exploit this vulnerability. In case custom plugins used in the website frontend accept and reflect rich-text content submitted by users, no authentication is required.

Solution

Update to TYPO3 versions 7.6.53 ELTS, 8.7.42 ELTS, 9.5.29, 10.4.19, 11.3.2 that fix the problem described above.

Custom package typo3/html-sanitizer - based on allow-lists only - takes care of sanitizing potentially malicious markup. The default behavior is based on safe and commonly used markup - however, this can be extended or restricted further in case it is necessary for individual scenarios.

During the frontend rendering process, sanitization is applied to the default TypoScript path lib.parseFunc, which is implicitly used by the Fluid view-helper instruction f:format.html. Rich-text data persisted using the backend user interface is sanitized as well. Implementation details are explained in corresponding ChangeLog documentation.

Credits

Thanks to Benjamin Stiber, Gert-Jan Jansma, Gábor Ács-Kurucz, Alexander Kellner, Richie Lee, Nina Rösch who reported this issue, and to TYPO3 security team member Oliver Hader, as well as TYPO3 contributor Susanne Moog who fixed the issue.

References

TYPO3-CORE-SA-2021-013

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.

typo3/cms-core Packagist

Ecosystem versions

From 7.0.0 before 7.6.53

Fixed in 7.6.53

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.0.0"
        },
        {
          "fixed": "7.6.53"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": []
}

typo3/cms-core Packagist

Ecosystem versions

From 8.0.0 before 8.7.42

Fixed in 8.7.42

26 explicitly affected versions

v8.7.10, v8.7.11, v8.7.12, v8.7.13, v8.7.14, v8.7.15, v8.7.16, v8.7.17, v8.7.18, v8.7.19, v8.7.20, v8.7.21, v8.7.22, v8.7.23, v8.7.24, v8.7.25, v8.7.26, v8.7.27, v8.7.28, v8.7.29, v8.7.30, v8.7.31, v8.7.32, v8.7.7, v8.7.8, v8.7.9

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.0.0"
        },
        {
          "fixed": "8.7.42"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v8.7.10",
    "v8.7.11",
    "v8.7.12",
    "v8.7.13",
    "v8.7.14",
    "v8.7.15",
    "v8.7.16",
    "v8.7.17",
    "v8.7.18",
    "v8.7.19",
    "v8.7.20",
    "v8.7.21",
    "v8.7.22",
    "v8.7.23",
    "v8.7.24",
    "v8.7.25",
    "v8.7.26",
    "v8.7.27",
    "v8.7.28",
    "v8.7.29",
    "v8.7.30",
    "v8.7.31",
    "v8.7.32",
    "v8.7.7",
    "v8.7.8",
    "v8.7.9"
  ]
}

typo3/cms-core Packagist

Ecosystem versions

From 10.0.0 before 10.4.19

Fixed in 10.4.19

25 explicitly affected versions

v10.0.0, v10.1.0, v10.2.0, v10.2.1, v10.2.2, v10.3.0, v10.4.0, v10.4.1, v10.4.10, v10.4.11, v10.4.12, v10.4.13, v10.4.14, v10.4.15, v10.4.16, v10.4.17, v10.4.18, v10.4.2, v10.4.3, v10.4.4, v10.4.5, v10.4.6, v10.4.7, v10.4.8, v10.4.9

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "10.0.0"
        },
        {
          "fixed": "10.4.19"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v10.0.0",
    "v10.1.0",
    "v10.2.0",
    "v10.2.1",
    "v10.2.2",
    "v10.3.0",
    "v10.4.0",
    "v10.4.1",
    "v10.4.10",
    "v10.4.11",
    "v10.4.12",
    "v10.4.13",
    "v10.4.14",
    "v10.4.15",
    "v10.4.16",
    "v10.4.17",
    "v10.4.18",
    "v10.4.2",
    "v10.4.3",
    "v10.4.4",
    "v10.4.5",
    "v10.4.6",
    "v10.4.7",
    "v10.4.8",
    "v10.4.9"
  ]
}

typo3/cms-core Packagist

Ecosystem versions

From 11.0.0 before 11.3.2

Fixed in 11.3.2

6 explicitly affected versions

v11.0.0, v11.1.0, v11.1.1, v11.2.0, v11.3.0, v11.3.1

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "11.0.0"
        },
        {
          "fixed": "11.3.2"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v11.0.0",
    "v11.1.0",
    "v11.1.1",
    "v11.2.0",
    "v11.3.0",
    "v11.3.1"
  ]
}

typo3/cms-core Packagist

Ecosystem versions

From 9.0.0 before 9.5.29

Fixed in 9.5.29

38 explicitly affected versions

v9.0.0, v9.1.0, v9.2.0, v9.2.1, v9.3.0, v9.3.1, v9.3.2, v9.3.3, v9.4.0, v9.5.0, v9.5.1, v9.5.10, v9.5.11, v9.5.12, v9.5.13, v9.5.14, v9.5.15, v9.5.16, v9.5.17, v9.5.18, v9.5.19, v9.5.2, v9.5.20, v9.5.21, v9.5.22, v9.5.23, v9.5.24, v9.5.25, v9.5.26, v9.5.27, v9.5.28, v9.5.3, v9.5.4, v9.5.5, v9.5.6, v9.5.7, v9.5.8, v9.5.9

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "9.0.0"
        },
        {
          "fixed": "9.5.29"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v9.0.0",
    "v9.1.0",
    "v9.2.0",
    "v9.2.1",
    "v9.3.0",
    "v9.3.1",
    "v9.3.2",
    "v9.3.3",
    "v9.4.0",
    "v9.5.0",
    "v9.5.1",
    "v9.5.10",
    "v9.5.11",
    "v9.5.12",
    "v9.5.13",
    "v9.5.14",
    "v9.5.15",
    "v9.5.16",
    "v9.5.17",
    "v9.5.18",
    "v9.5.19",
    "v9.5.2",
    "v9.5.20",
    "v9.5.21",
    "v9.5.22",
    "v9.5.23",
    "v9.5.24",
    "v9.5.25",
    "v9.5.26",
    "v9.5.27",
    "v9.5.28",
    "v9.5.3",
    "v9.5.4",
    "v9.5.5",
    "v9.5.6",
    "v9.5.7",
    "v9.5.8",
    "v9.5.9"
  ]
}

typo3/cms Packagist

Ecosystem versions

From 10.0.0 before 10.4.19

Fixed in 10.4.19

25 explicitly affected versions

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "10.0.0"
        },
        {
          "fixed": "10.4.19"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v10.0.0",
    "v10.1.0",
    "v10.2.0",
    "v10.2.1",
    "v10.2.2",
    "v10.3.0",
    "v10.4.0",
    "v10.4.1",
    "v10.4.10",
    "v10.4.11",
    "v10.4.12",
    "v10.4.13",
    "v10.4.14",
    "v10.4.15",
    "v10.4.16",
    "v10.4.17",
    "v10.4.18",
    "v10.4.2",
    "v10.4.3",
    "v10.4.4",
    "v10.4.5",
    "v10.4.6",
    "v10.4.7",
    "v10.4.8",
    "v10.4.9"
  ]
}

typo3/cms Packagist

Ecosystem versions

From 11.0.0 before 11.3.2

Fixed in 11.3.2

6 explicitly affected versions

v11.0.0, v11.1.0, v11.1.1, v11.2.0, v11.3.0, v11.3.1

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "11.0.0"
        },
        {
          "fixed": "11.3.2"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v11.0.0",
    "v11.1.0",
    "v11.1.1",
    "v11.2.0",
    "v11.3.0",
    "v11.3.1"
  ]
}

typo3/cms Packagist

Ecosystem versions

From 9.0.0 before 9.5.29

Fixed in 9.5.29

38 explicitly affected versions

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "9.0.0"
        },
        {
          "fixed": "9.5.29"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v9.0.0",
    "v9.1.0",
    "v9.2.0",
    "v9.2.1",
    "v9.3.0",
    "v9.3.1",
    "v9.3.2",
    "v9.3.3",
    "v9.4.0",
    "v9.5.0",
    "v9.5.1",
    "v9.5.10",
    "v9.5.11",
    "v9.5.12",
    "v9.5.13",
    "v9.5.14",
    "v9.5.15",
    "v9.5.16",
    "v9.5.17",
    "v9.5.18",
    "v9.5.19",
    "v9.5.2",
    "v9.5.20",
    "v9.5.21",
    "v9.5.22",
    "v9.5.23",
    "v9.5.24",
    "v9.5.25",
    "v9.5.26",
    "v9.5.27",
    "v9.5.28",
    "v9.5.3",
    "v9.5.4",
    "v9.5.5",
    "v9.5.6",
    "v9.5.7",
    "v9.5.8",
    "v9.5.9"
  ]
}

typo3/cms Packagist

Ecosystem versions

From 8.0.0 before 8.7.42

Fixed in 8.7.42

48 explicitly affected versions

8.0.0, 8.0.1, 8.1.0, 8.1.1, 8.1.2, 8.2.0, 8.2.1, 8.3.0, 8.3.1, 8.4.0, 8.4.1, 8.5.0, 8.5.1, 8.6.0, 8.6.1, 8.7.0, 8.7.1, 8.7.2, v8.7.10, v8.7.11, v8.7.12, v8.7.13, v8.7.14, v8.7.15, v8.7.16, v8.7.17, v8.7.18, v8.7.19, v8.7.20, v8.7.21, v8.7.22, v8.7.23, v8.7.24, v8.7.25, v8.7.26, v8.7.27, v8.7.28, v8.7.29, v8.7.3, v8.7.30, v8.7.31, v8.7.32, v8.7.4, v8.7.5, v8.7.6, v8.7.7, v8.7.8, v8.7.9

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.0.0"
        },
        {
          "fixed": "8.7.42"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "8.0.0",
    "8.0.1",
    "8.1.0",
    "8.1.1",
    "8.1.2",
    "8.2.0",
    "8.2.1",
    "8.3.0",
    "8.3.1",
    "8.4.0",
    "8.4.1",
    "8.5.0",
    "8.5.1",
    "8.6.0",
    "8.6.1",
    "8.7.0",
    "8.7.1",
    "8.7.2",
    "v8.7.10",
    "v8.7.11",
    "v8.7.12",
    "v8.7.13",
    "v8.7.14",
    "v8.7.15",
    "v8.7.16",
    "v8.7.17",
    "v8.7.18",
    "v8.7.19",
    "v8.7.20",
    "v8.7.21",
    "v8.7.22",
    "v8.7.23",
    "v8.7.24",
    "v8.7.25",
    "v8.7.26",
    "v8.7.27",
    "v8.7.28",
    "v8.7.29",
    "v8.7.3",
    "v8.7.30",
    "v8.7.31",
    "v8.7.32",
    "v8.7.4",
    "v8.7.5",
    "v8.7.6",
    "v8.7.7",
    "v8.7.8",
    "v8.7.9"
  ]
}

typo3/cms Packagist

Ecosystem versions

From 7.0.0 before 7.6.53

Fixed in 7.6.53

42 explicitly affected versions

7.0.0, 7.0.1, 7.0.2, 7.1.0, 7.2.0, 7.3.0, 7.3.1, 7.4.0, 7.5.0, 7.6.0, 7.6.1, 7.6.10, 7.6.11, 7.6.12, 7.6.13, 7.6.14, 7.6.15, 7.6.16, 7.6.17, 7.6.18, 7.6.19, 7.6.2, 7.6.3, 7.6.4, 7.6.5, 7.6.6, 7.6.7, 7.6.8, 7.6.9, v7.6.20, v7.6.21, v7.6.22, v7.6.23, v7.6.24, v7.6.25, v7.6.26, v7.6.27, v7.6.28, v7.6.29, v7.6.30, v7.6.31, v7.6.32

View affected-version evidence

{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.0.0"
        },
        {
          "fixed": "7.6.53"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "7.0.0",
    "7.0.1",
    "7.0.2",
    "7.1.0",
    "7.2.0",
    "7.3.0",
    "7.3.1",
    "7.4.0",
    "7.5.0",
    "7.6.0",
    "7.6.1",
    "7.6.10",
    "7.6.11",
    "7.6.12",
    "7.6.13",
    "7.6.14",
    "7.6.15",
    "7.6.16",
    "7.6.17",
    "7.6.18",
    "7.6.19",
    "7.6.2",
    "7.6.3",
    "7.6.4",
    "7.6.5",
    "7.6.6",
    "7.6.7",
    "7.6.8",
    "7.6.9",
    "v7.6.20",
    "v7.6.21",
    "v7.6.22",
    "v7.6.23",
    "v7.6.24",
    "v7.6.25",
    "v7.6.26",
    "v7.6.27",
    "v7.6.28",
    "v7.6.29",
    "v7.6.30",
    "v7.6.31",
    "v7.6.32"
  ]
}

Set up in your agent.

Investigate in your agent.

Cross-Site Scripting via Rich-Text Content

The advisory, in context

Meta

Problem

Solution

Credits

References

Affected packages

References