Insecure Unserialize in TYPO3 Import/Export

Categories: TYPO3 CMS Created by Nicole Cordes
It has been discovered, that TYPO3 is susceptible to Insecure Unserialize.

Component Type: TYPO3 CMS

Release Date: July 19, 2016

Vulnerable subcomponent: Import/Export

Vulnerability Type: Insecure Unserialize

Affected Versions: Versions 6.2.0 to 6.2.25, 7.6.0 to 7.6.9 and 8.0.0 to 8.2.0

Severity: Medium

Suggested CVSS v2.0: AV:N/AC:H/Au:S/C:P/I:P/A:P/E:P/RL:O/RC:C

CVE: not assigned yet

Problem Description: Failing to properly validate incoming import data, the Import/Export component is susceptible to insecure unserialize. To exploit this vulnerability a valid backend user account is needed.

Solution: In the released TYPO3 versions 6.2.26, 7.6.10 or 8.2.1 the Import/Export module is disabled by default for non-admin users. To re-activate the Import/Export module for trusted users, please add "options.impexp.enableImportForNonAdminUser = 1" to the users TSconfig.

Credits: Thanks to Franz Jahn who discovered and reported the issue.

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

General Note: All security related code changes are tagged so that you can easily look them up on our review system.