GHSA-3x94-fv5h-5q2c
Exposure of Sensitive Information to an Unauthorized Actor in TYPO3 CMS
Quick fix
GHSA-3x94-fv5h-5q2c — typo3/cms-core: upgrade to the fixed version with the command below.
composer require typo3/cms-core:^9.5.20Details
> ### Meta > * CVSS: `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) > * CWE-20, CWE-200
### Problem In case an attacker manages to generate a valid cryptographic message authentication code (HMAC-SHA1) - either by using a different existing vulnerability or in case the internal _encryptionKey_ was exposed - it is possible to retrieve arbitrary files of a TYPO3 installation. This includes the possibility to fetch _typo3conf/LocalConfiguration.php_ which again contains the _encryptionKey_ as well as credentials of the database management system being used.
In case a database server is directly accessible either via internet or in a shared hosting network, this allows to completely retrieve, manipulate or delete database contents. This includes creating an administration user account - which can be used to trigger remote code execution by injecting custom extensions.
### Solution Update to TYPO3 versions 9.5.20 or 10.4.6 that fix the problem described.
### Credits Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.
### References * [TYPO3-CORE-SA-2020-007](https://typo3.org/security/advisory/typo3-core-sa-2020-007)
Are you affected?
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Affected packages
9.0.0Fixed in: 9.5.20composer require typo3/cms-core:^9.5.2010.0.0Fixed in: 10.4.6composer require typo3/cms-core:^10.4.6References
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3x94-fv5h-5q2c[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2020-15099[ADVISORY]
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2020-15099.yaml[WEB]
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2020-15099.yaml[WEB]
- https://github.com/TYPO3/TYPO3.CMS[PACKAGE]
- https://typo3.org/security/advisory/typo3-core-sa-2020-007[WEB]