CVE-2021-25829
First published: Mon Mar 01 2021(Updated: )
An improper binary stream data handling issue was found in the [core] module of ONLYOFFICE DocumentServer v4.0.0-9-v5.6.3. Using this bug, an attacker is able to produce a denial of service attack that can eventually shut down the target server.
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/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Comments.h#L299
- https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Core.h#L161
- https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/NotesMaster.h#L148
- https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/NotesSlide.h#L141
- https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Presentation.h#L277
- https://github.com/ONLYOFFICE/core/blob/c1e4a2ce33bdcfab29d670f5fdb10fc63cf5fd6a/ASCOfficePPTXFile/PPTXFormat/Theme.h#L277
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.10/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1722
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25829
Frequently Asked Questions
What is the severity of CVE-2021-25829?
CVE-2021-25829 has a medium severity rating due to its potential for denial of service attacks.
How do I fix CVE-2021-25829?
To address CVE-2021-25829, users should upgrade ONLYOFFICE DocumentServer to a version later than 5.6.3.
What type of vulnerability is CVE-2021-25829?
CVE-2021-25829 is a denial of service vulnerability caused by improper binary stream data handling.
Which versions of ONLYOFFICE DocumentServer are affected by CVE-2021-25829?
Versions from 4.0.0-9 to 5.6.3 of ONLYOFFICE DocumentServer are vulnerable to CVE-2021-25829.
What can an attacker achieve by exploiting CVE-2021-25829?
An attacker exploiting CVE-2021-25829 can create conditions that may lead to a denial of service and shutdown the target server.
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- version/onlyoffice/4.0.0-9
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