Vulnerability Details : CVE-2021-25830
Potential exploit
A file extension handling issue was found in [core] module of ONLYOFFICE DocumentServer v4.2.0.236-v5.6.4.13. An attacker must request the conversion of the crafted file from DOCT into DOCX format. Using the chain of two other bugs related to improper string handling, an attacker can achieve remote code execution on DocumentServer.
Vulnerability category: Execute code
Products affected by CVE-2021-25830
- Onlyoffice » Document ServerVersions from including (>=) 4.2.0.236 and up to, including, (<=) 5.6.4.13cpe:2.3:a:onlyoffice:document_server:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-25830
8.95%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 95 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-25830
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
References for CVE-2021-25830
-
https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L241
core/BinaryFileReaderWriter.cpp at v5.6.4.13 · ONLYOFFICE/core · GitHubThird Party Advisory
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https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1918
core/BinaryFileReaderWriter.cpp at v5.6.4.13 · ONLYOFFICE/core · GitHubThird Party Advisory
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https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/PPTXFormat/Logic/UniFill.cpp#L343
core/UniFill.cpp at v5.6.4.13 · ONLYOFFICE/core · GitHubThird Party Advisory
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https://github.com/ONLYOFFICE/DocumentServer
GitHub - ONLYOFFICE/DocumentServer: ONLYOFFICE Document Server is an online office suite comprising viewers and editors for texts, spreadsheets and presentations, fully compatible with Office Open XMLProduct
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https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25830
poc_exploits/ONLYOFFICE/CVE-2021-25830 at master · merrychap/poc_exploits · GitHubExploit;Third Party Advisory
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https://github.com/ONLYOFFICE/core
GitHub - ONLYOFFICE/core: Server core components which are a part of ONLYOFFICE Document ServerProduct
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