CVE-2020-11067: Typo3/cms core Insecure Deserialization Vulnerability

Q: What is CVE-2020-11067?

CVE-2020-11067 is a security vulnerability in Typo3/cms core involving Insecure Deserialization in Backend User Settings in TYPO3 CMS under CWE-502: Deserialization of Untrusted Data.

Q: Which Typo3/cms core versions are affected?

Affected versions include releases prior to 9.5.17, 10.4.2 across affected packages: typo3/cms-core, typo3/cms.

Q: What version fixes CVE-2020-11067?

Upgrading to 9.5.17, 10.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is typo3/cms-core affected?

Yes, typo3/cms-core is affected in releases prior to 9.5.17, 10.4.2. Upgrade your dependency to 9.5.17, 10.4.2 or later.

Q: Is typo3/cms affected?

Yes, typo3/cms is affected in releases prior to 10.4.2, 9.5.17. Upgrade your dependency to 10.4.2, 9.5.17 or later.

Q: What is the CVSS score of CVE-2020-11067?

CVE-2020-11067 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Q: What CWE is associated with CVE-2020-11067?

CVE-2020-11067 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).

Q: How can I check Packagist dependencies for CVE-2020-11067?

Run the dependency tree command: 'inspect dependencies for typo3/cms-core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-2wj9-434x-9hvp

CVSS 8.8

CWE-502

Published 2020-05-13

Advisory Summary

CVE-2020-11067 is a HIGH (CVSS 8.8) insecure deserialization vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Typo3/cms core libraries in the Packagist ecosystem. The issue involves insecure deserialization in backend user settings in typo3 cms. Remediation is available by upgrading affected packages to version 9.5.17, 10.4.2.

CVE-2020-11067 at a Glance

CVE Identifier CVE-2020-11067

GHSA Identifier GHSA-2wj9-434x-9hvp

Severity HIGH

CVSS v3.1 Base Score 8.8

CWE Classification CWE-502: Deserialization of Untrusted Data

Affected Product Typo3/cms core

Package Ecosystem Packagist

Published Date 2020-05-13

Last Updated 2021-01-08

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required Low (PR:L)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2020-11067

To remediate this vulnerability, upgrade all affected Typo3/cms core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

typo3/cms-core fixed: 9.5.17

Upgrade typo3/cms-core to 9.5.17

typo3/cms-core fixed: 10.4.2

Upgrade typo3/cms-core to 10.4.2

typo3/cms fixed: 10.4.2

Upgrade typo3/cms to 10.4.2

typo3/cms fixed: 9.5.17

Upgrade typo3/cms to 9.5.17

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for typo3/cms-core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-11067, inspect your project dependencies for Typo3/cms core:

inspect dependencies for typo3/cms-core

Analyze the terminal output to locate any version of Typo3/cms core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.5.17), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Typo3/cms core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

It has been discovered that backend user settings (in $BE_USER->uc) are vulnerable to insecure deserialization. In combination with vulnerabilities of 3rd party components this can lead to remote code execution. A valid backend user account is needed to exploit this vulnerability. Update to TYPO3 versions 9.5.17 or 10.4.2 that fix the problem described. ### References * https://typo3.org/security/advisory/typo3-core-sa-2020-005

CVE-2020-11067 Affected Typo3/cms core Versions

4 component(s)

Fixed Versions:

9.5.1710.4.2

Product / Package	Ecosystem	Affected Versions	Fixed Version
typo3/cms-core	Packagist	≥ 9.0.0 < 9.5.17	9.5.17
typo3/cms-core	Packagist	≥ 10.0.0 < 10.4.2	10.4.2
typo3/cms	Packagist	≥ 10.0.0 < 10.4.2	10.4.2
typo3/cms	Packagist	≥ 9.0.0 < 9.5.17	9.5.17

References

GitHub Advisory / Wiki ADVISORY

https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-2wj9-434x-9hvp

NVD — CVE-2020-11067 NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-11067

Typo3/cms core Source Repository REPOSITORY

https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2020-11067.yaml

Typo3/cms core Source Repository REPOSITORY

https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2020-11067.yaml

Typo3/cms core Security Information SECURITY

https://typo3.org/security/advisory/typo3-core-sa-2020-005

Frequently Asked Questions

What is CVE-2020-11067?

CVE-2020-11067 is a security vulnerability in Typo3/cms core involving Insecure Deserialization in Backend User Settings in TYPO3 CMS under CWE-502: Deserialization of Untrusted Data.

Which Typo3/cms core versions are affected?

Affected versions include releases prior to 9.5.17, 10.4.2 across affected packages: typo3/cms-core, typo3/cms.

What version fixes CVE-2020-11067?

Upgrading to 9.5.17, 10.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Is typo3/cms-core affected?

Yes, typo3/cms-core is affected in releases prior to 9.5.17, 10.4.2. Upgrade your dependency to 9.5.17, 10.4.2 or later.

Is typo3/cms affected?

Yes, typo3/cms is affected in releases prior to 10.4.2, 9.5.17. Upgrade your dependency to 10.4.2, 9.5.17 or later.

What is the CVSS score of CVE-2020-11067?

CVE-2020-11067 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2020-11067?

CVE-2020-11067 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).

How can I check Packagist dependencies for CVE-2020-11067?

Run the dependency tree command: 'inspect dependencies for typo3/cms-core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2wj9-434x-9hvp",
  "modified" : "2021-01-08T20:16:42Z",
  "published" : "2020-05-13T23:29:04Z",
  "aliases" : [ "CVE-2020-11067" ],
  "summary" : "Insecure Deserialization in Backend User Settings in TYPO3 CMS",
  "details" : "It has been discovered that backend user settings (in $BE_USER->uc) are vulnerable to insecure deserialization. In combination with vulnerabilities of 3rd party components this can lead to remote code execution. A valid backend user account is needed to exploit this vulnerability.\n\nUpdate to TYPO3 versions 9.5.17 or 10.4.2 that fix the problem described.\n\n### References\n* https://typo3.org/security/advisory/typo3-core-sa-2020-005",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.5.17"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.4.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.4.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "typo3/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.0.0"
      }, {
        "fixed" : "9.5.17"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-2wj9-434x-9hvp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-11067"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2020-11067.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2020-11067.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-core-sa-2020-005"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-05-13T23:28:47Z",
    "nvd_published_at" : null
  }
}

CVSS V3

8.8 HIGH