Advisory Weakness Curation

Potential Remote Code Execution in TYPO3 with mediace extension > ### Meta > * 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` (9.1) > * CWE-325, CWE-20, CWE-200, CWE-502 ### Problem 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 https://typo3.org/security/advisory/typo3-core-sa-2020-007, CVE-2020-15099 https://nvd.nist.gov/vuln/detail/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 https://typo3.org/security/advisory/typo3-core-sa-2016-013, CVE-2016-5091 https://nvd.nist.gov/vuln/detail/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: * https://extensions.typo3.org/extension/download/mediace/7.6.5/zip/ * https://packagist.org/packages/friendsoftypo3/mediace#7.6.5 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. ### References * TYPO3-EXT-SA-2020-014 https://typo3.org/security/advisory/typo3-ext-sa-2020-014

Deserialization of Untrusted Data In TYPO3 installations with the `mediace` extension, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. The allows to inject arbitrary data having a valid cryptographic message authentication code and can lead to remote code execution. To successfully exploit this vulnerability, an attacker must have access to at least one `Extbase` plugin or module action in a TYPO3 installation.