CVE-2019-16409: Unpublished files are exposed publicly

November 12, 2019 (updated July 27, 2021)

In the Versioned Files module through 2.0.3 for SilverStripe 3.x, unpublished versions of files are publicly exposed to anyone who can guess their URL. This guess could be highly informed by a basic understanding of the symbiote/silverstripe-versionedfiles source code. (Users who upgrade from SilverStripe 3.x to 4.x and had Versioned Files installed have no further need for this module, because the 4.x release has built-in versioning. However, nothing in the upgrade process automates the destruction of these insecure artefacts, nor alerts the user to the criticality of destruction.)

References

github.com/advisories/GHSA-xm6j-x342-gwq9
github.com/silverstripe/silverstripe-framework
github.com/symbiote/silverstripe-versionedfiles
nvd.nist.gov/vuln/detail/CVE-2019-16409
www.silverstripe.org/download/security-releases/cve-2019-16409

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