Silverstripe CMS through 4.5 can be susceptible to script execution from malicious upload contents under allowed file extensions (for example HTML code in a TXT file). When these files are stored as protected or draft files, the MIME detection can cause browsers to execute the file contents. Uploads stored as protected or draft files are allowed by default for authorised users only, but can also be enabled through custom logic as well as modules such as silverstripe/userforms. Sites using the previously optional silverstripe/mimevalidator module can configure MIME whitelists rather than extension whitelists, and hence prevent this issue. Sites on the Common Web Platform (CWP) use this module by default, and are not affected.
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Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: mitre
Published: 2020-07-15T20:57:20
Updated: 2024-08-04T10:26:16.029Z
Reserved: 2020-02-20T00:00:00
Link: CVE-2020-9309
Vulnrichment
No data.
NVD
Status : Modified
Published: 2020-07-15T21:15:13.740
Modified: 2024-11-21T05:40:23.520
Link: CVE-2020-9309
Redhat
No data.