CVE-2021-25833: Path Traversal
First published: Mon Mar 01 2021(Updated: )
A file extension handling issue was found in [server] module of ONLYOFFICE DocumentServer v4.2.0.71-v5.6.0.21. The file extension is controlled by an attacker through the request data and leads to arbitrary file overwriting. Using this vulnerability, a remote attacker can obtain remote code execution on DocumentServer.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ONLYOFFICE Document Server | >=4.2.0.71<=5.6.0.21 |
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Reference Links
- https://github.com/ONLYOFFICE/DocumentServer
- https://github.com/ONLYOFFICE/server
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/DocService/sources/converterservice.js#L200
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L283
- https://github.com/ONLYOFFICE/server/blob/v5.6.0.21/FileConverter/sources/converter.js#L593
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25833
Frequently Asked Questions
What is CVE-2021-25833 about?
A file extension handling issue in ONLYOFFICE DocumentServer allows an attacker to control the file extension through request data and overwrite files.
How severe is CVE-2021-25833?
CVE-2021-25833 has a severity rating of 9.8 (Critical).
How can I mitigate CVE-2021-25833?
To mitigate CVE-2021-25833, update ONLYOFFICE DocumentServer to a version beyond 5.6.0.21 or apply patches provided by the vendor.
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- vendor/onlyoffice
- canonical/onlyoffice document server
- version/onlyoffice document server/4.2.0.71
- version/onlyoffice document server/5.6.0.21