CVE-2020-11535 : What You Need to Know

ONLYOFFICE Document Server 5.5.0 allows attackers to execute code via crafted .docx files.

Understanding CVE-2020-11535

An issue in ONLYOFFICE Document Server 5.5.0 allows attackers to exploit XML injection to execute code on a victim's server.

What is CVE-2020-11535?

This CVE refers to a vulnerability in ONLYOFFICE Document Server 5.5.0 that enables attackers to manipulate a .docx file to inject malicious content and execute code on the server.

The Impact of CVE-2020-11535

The vulnerability allows attackers to rewrite binaries and execute arbitrary code on the victim's server, potentially leading to unauthorized access and data compromise.

Technical Details of CVE-2020-11535

ONLYOFFICE Document Server 5.5.0 vulnerability details.

Vulnerability Description

Attackers can exploit XML injection in .docx files to insert malicious parameters into binaries, leading to code execution on the server.

Affected Systems and Versions

ONLYOFFICE Document Server 5.5.0

Exploitation Mechanism

Crafted .docx files with XML injection
Manipulation of x2t binary
Rewriting of binaries like libxcb.so.1

Mitigation and Prevention

Protect systems from CVE-2020-11535.

Immediate Steps to Take

Update ONLYOFFICE Document Server to a patched version
Implement strict file validation mechanisms
Monitor server activities for suspicious behavior

Long-Term Security Practices

Regular security audits and assessments
Employee training on secure document handling
Implementing network segmentation and access controls

Patching and Updates

Apply security patches provided by ONLYOFFICE