CVE-2017-6188 : Security Advisory and Response

This CVE involves a vulnerability in Munin versions earlier than 2.999.6 when CGI graphs are enabled, allowing local file write. By exploiting multiple upper_limit GET parameters, an attacker can overwrite any file accessible by the user www-data.

Understanding CVE-2017-6188

This CVE was published on February 22, 2017, and poses a risk to systems with vulnerable versions of Munin.

What is CVE-2017-6188?

CVE-2017-6188 is a local file write vulnerability in Munin versions prior to 2.999.6, which can be exploited when CGI graphs are enabled.

The Impact of CVE-2017-6188

The vulnerability allows an attacker to overwrite files accessible by the www-data user, potentially leading to unauthorized modifications and data breaches.

Technical Details of CVE-2017-6188

This section provides in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability in Munin versions before 2.999.6 enables local file write through the exploitation of multiple upper_limit GET parameters.

Affected Systems and Versions

Affected Product: Munin
Affected Version: < 2.999.6

Exploitation Mechanism

By utilizing multiple upper_limit GET parameters, attackers can overwrite any file accessible by the user www-data.

Mitigation and Prevention

Protect your systems from CVE-2017-6188 with the following measures.

Immediate Steps to Take

Disable CGI graphs in Munin if not essential.
Regularly monitor and review file permissions to prevent unauthorized access.
Implement network segmentation to limit the impact of potential breaches.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify vulnerabilities.
Keep software and systems updated to patch known security flaws.

Patching and Updates

Update Munin to version 2.999.6 or newer to mitigate the vulnerability and enhance system security.