CVE-2021-25831
First published: Mon Mar 01 2021(Updated: )
A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. An attacker must request the conversion of the crafted file from PPTT into PPTX format. Using the chain of two other bugs related to improper string handling, a remote attacker can obtain remote code execution on DocumentServer.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ONLYOFFICE | >=4.0.0-9<=5.6.3 |
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Reference Links
- https://github.com/ONLYOFFICE/DocumentServer
- https://github.com/ONLYOFFICE/core
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1918
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L241
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/PPTXFormat/Logic/Fills/BlipFill.cpp#L328
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25831
Frequently Asked Questions
What is the severity of CVE-2021-25831?
CVE-2021-25831 is classified as a high severity vulnerability due to its potential for remote code execution.
How do I fix CVE-2021-25831?
To fix CVE-2021-25831, you should update ONLYOFFICE DocumentServer to version 5.6.4 or later.
What kind of attack does CVE-2021-25831 facilitate?
CVE-2021-25831 facilitates remote code execution by allowing an attacker to exploit file conversion processes.
Which versions of ONLYOFFICE DocumentServer are affected by CVE-2021-25831?
CVE-2021-25831 affects ONLYOFFICE DocumentServer versions from 4.0.0-9 up to 5.6.3.
What files are involved in the exploitation of CVE-2021-25831?
The exploitation of CVE-2021-25831 involves the conversion of crafted PPTT files into PPTX format.
- agent/references
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/author
- agent/severity
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/tags
- agent/softwarecombine
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/onlyoffice
- canonical/onlyoffice
- version/onlyoffice/4.0.0-9
- version/onlyoffice/5.6.3