File Extension Handling Flaw in ONLYOFFICE DocumentServer
CVE-2021-25831

9.8CRITICAL

Key Information:

Vendor

Onlyoffice

Status
Document Server
Vendor
CVE Published:
1 March 2021

What is CVE-2021-25831?

A vulnerability exists in the ONLYOFFICE DocumentServer where improper handling of file extensions allows an attacker to convert a specially crafted PPTT file into PPTX format. By exploiting this flaw along with additional string handling weaknesses, a remote attacker could execute arbitrary code on the server. This exploitation poses a significant security risk for users relying on DocumentServer versions 4.0.0-9-v5.6.3.

References

https://github.com/ONLYOFFICE/DocumentServer
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https://github.com/ONLYOFFICE/core
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https://github.com/ONLYOFFICE/core/blob/v5.6.4.13/ASCOffi...
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CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2021-25831 : File Extension Handling Flaw in ONLYOFFICE DocumentServer