CVE-2019-6109 : Exploit Details and Defense Strategies

OpenSSH 7.9 Progress Display Manipulation Vulnerability

Understanding CVE-2019-6109

OpenSSH 7.9 vulnerability allows manipulation of client output by a malicious server or Man-in-The-Middle attacker.

What is CVE-2019-6109?

The vulnerability in OpenSSH 7.9 allows attackers to manipulate client output using specially crafted object names, potentially hiding extra files during transfer.

The Impact of CVE-2019-6109

Malicious servers or attackers can manipulate client output in OpenSSH 7.9
Possibility of hiding extra files during transfer

Technical Details of CVE-2019-6109

OpenSSH 7.9 Progress Display Manipulation Vulnerability

Vulnerability Description

The vulnerability exists in the refresh_progress_meter() function in the progressmeter.c file of OpenSSH 7.9, allowing manipulation of client output.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions affected

Exploitation Mechanism

Attackers can exploit this vulnerability by using specially crafted object names, such as ANSI control codes, to manipulate the client output.

Mitigation and Prevention

Protecting Against OpenSSH 7.9 Progress Display Manipulation

Immediate Steps to Take

Update OpenSSH to the latest version
Monitor network traffic for any suspicious activity
Implement strong encryption and authentication mechanisms

Long-Term Security Practices

Regularly update and patch software to address vulnerabilities
Conduct security audits and penetration testing
Educate users on safe browsing habits and phishing awareness

Patching and Updates

Apply patches provided by OpenSSH promptly
Stay informed about security advisories and updates from trusted sources