CVE-2019-3463 : Security Advisory and Response

Rsync in rssh on Debian GNU/Linux before 2.3.4-5+deb9u2 and 2.3.4-10 allows unauthorized execution of shell commands due to insufficient input sanitization.

Understanding CVE-2019-3463

Rsync vulnerability in rssh on Debian GNU/Linux.

What is CVE-2019-3463?

Insufficient sanitization of arguments in rsync bypasses rssh restrictions, enabling unauthorized shell command execution.

The Impact of CVE-2019-3463

Attackers can execute arbitrary shell commands, bypassing intended restrictions.

Technical Details of CVE-2019-3463

Rsync vulnerability in rssh on Debian GNU/Linux.

Vulnerability Description

Lack of proper input sanitization in rsync allows users to bypass rssh limitations.

Affected Systems and Versions

Product: rssh
Vendor: Debian GNU/Linux
Versions affected: All versions before 2.3.4-5+deb9u2 and 2.3.4-10

Exploitation Mechanism

Attackers exploit incomplete sanitization of passed arguments to execute unauthorized shell commands.

Mitigation and Prevention

Protect systems from CVE-2019-3463.

Immediate Steps to Take

Update rssh to version 2.3.4-5+deb9u2 or 2.3.4-10.
Monitor system logs for unusual shell command executions.

Long-Term Security Practices

Implement strict input validation in all applications.
Regularly review and update security configurations.
Conduct security training for system administrators.

Patching and Updates

Apply security patches promptly to mitigate vulnerabilities.