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GHSA-jf56-v8jc-jcc5low2.1

TYPO3 CMS has Broken Access Control in its File Abstraction Layer

Impact

The path allowance check in GeneralUtility::isAllowedAbsPath() performed a plain string prefix comparison without requiring a directory separator boundary, causing a path like /var/www/html-other/secret.yaml to be incorrectly accepted as valid when the project root was /var/www/html. Administrator users with access to the File Abstraction Layer were able to create new file storage definitions pointing to directories outside the project root, bypassing this path check.

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

typo3/cms-core Packagist
Affected rangeRecorded fix
Earlier releases before 10.4.57Ecosystem versions10.4.57
From 11.0.0 before 11.5.51Ecosystem versions11.5.51
From 12.0.0 before 12.4.46Ecosystem versions12.4.46
From 13.0.0 before 13.4.31Ecosystem versions13.4.31
From 14.0.0 before 14.3.3Ecosystem versions14.3.3

Version evidence: OSV · GHSA-jf56-v8jc-jcc5

View original version evidence (262 explicit versions)

Original source description

Problem

The path allowance check in GeneralUtility::isAllowedAbsPath() performed a plain string prefix comparison without requiring a directory separator boundary, causing a path like /var/www/html-other/secret.yaml to be incorrectly accepted as valid when the project root was /var/www/html. Administrator users with access to the File Abstraction Layer were able to create new file storage definitions pointing to directories outside the project root, bypassing this path check.

Solution

Update to TYPO3 versions 10.4.57 ELTS, 11.5.51 ELTS, 12.4.46 ELTS, 13.4.31 LTS, 14.3.3 LTS that fix the problem described.

Credits

TYPO3 CMS thanks Wolfgang Klinger for reporting this issue, and to TYPO3 core & security team member Oliver Hader for fixing it.

Resources

References