Vulnerability · Published Mar 1, 2021 · Assigned by mitre
CVE-2021-25830
Critical 9.8
In plain English
A critical-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 11.8% (higher than 96% of all known vulnerabilities).
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)11.8%top 3.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
References
- https://github.com/ONLYOFFICE/DocumentServer x_refsource_MISC
- https://github.com/ONLYOFFICE/core x_refsource_MISC
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/PPTXFormat/Logic/UniFill.cpp#L343 x_refsource_MISC
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L241 x_refsource_MISC
- https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOfficePPTXFile/Editor/BinaryFileReaderWriter.cpp#L1918 x_refsource_MISC
- https://github.com/merrychap/poc_exploits/tree/master/ONLYOFFICE/CVE-2021-25830 x_refsource_MISC