CVE-2020-11536 Explained : Impact and Mitigation

An issue was discovered in ONLYOFFICE Document Server 5.5.0. An attacker can craft a malicious .docx file, exploit the unzip function, rewrite a binary, and remotely execute code on a victim's server.

Understanding CVE-2020-11536

This CVE involves a vulnerability in ONLYOFFICE Document Server 5.5.0 that allows remote code execution.

What is CVE-2020-11536?

The vulnerability in ONLYOFFICE Document Server 5.5.0 enables an attacker to manipulate a .docx file to execute code on a server remotely.

The Impact of CVE-2020-11536

The exploitation of this vulnerability can lead to unauthorized remote code execution on the victim's server, potentially causing severe security breaches.

Technical Details of CVE-2020-11536

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in ONLYOFFICE Document Server 5.5.0 allows attackers to exploit the unzip function to rewrite binaries and execute code remotely.

Affected Systems and Versions

ONLYOFFICE Document Server 5.5.0

Exploitation Mechanism

Attackers can craft a malicious .docx file to trigger the vulnerability, enabling them to rewrite binaries and execute code on the victim's server.

Mitigation and Prevention

Protecting systems from CVE-2020-11536 is crucial to prevent potential security risks.

Immediate Steps to Take

Update ONLYOFFICE Document Server to the latest version
Implement network segmentation to limit the impact of potential attacks
Educate users on safe file handling practices

Long-Term Security Practices

Regularly monitor and audit server logs for suspicious activities
Conduct security assessments and penetration testing to identify vulnerabilities
Stay informed about security updates and patches
Implement access controls and least privilege principles

Patching and Updates

Ensure timely installation of security patches and updates for ONLYOFFICE Document Server to mitigate the risk of exploitation.