TYPO3-EXT-SA-2020-014: Sensitive Information Disclosure in extension "Media Content Element" (mediace)

  • Release Date: July 28, 2020
  • Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
  • Component: Media Content Element (mediace)
  • Vulnerability Type: Sensitive Information Disclosure
  • Affected Versions: 7.6.4 and below
  • Severity: Critical
  • Suggested CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
  • References: CVE-2020-15086

Problem Description

It has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains as described below.

  • TYPO3-CORE-SA-2020-007, CVE-2020-15099: Potential Privilege Escalation
    • the database server used for a TYPO3 installation must be accessible for an attacker (either via internet or shared hosting network)
    • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (7.5, high)
  • TYPO3-CORE-SA-2016-013, CVE-2016-5091: Insecure Deserialization & Remote Code Execution
    • an attacker must have access to at least one Extbase plugin or module action in a TYPO3 installation
    • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (9.1, critical)

The overall severity of this vulnerability is critical (9.1) based on mentioned attack chains and the fact it does not require any privileges.

Solution

In case the extension is not used and required at all, it is suggested to uninstall and remove it from the system completely. Otherwise, an updated version 7.6.5 is available from the TYPO3 extension manager, Packagist and the TYPO3 extension repository:

As a precautionary measure it is advised to change encryptionKey and database credentials in typo3conf/LocalConfiguration.php.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.

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