CVE-2017-6900 : What You Need to Know

A vulnerability has been identified in Riello NetMan 204 14-2 and 15-2, allowing unauthorized access and potential administrative control.

Understanding CVE-2017-6900

What is CVE-2017-6900?

CVE-2017-6900 is a security flaw in Riello NetMan 204 14-2 and 15-2 related to the login script and wrongpass Python script used for authentication.

The Impact of CVE-2017-6900

Exploiting this vulnerability can lead to unauthorized access, administrative privileges, and the ability to manipulate telnet/ssh services and reset local user credentials.

Technical Details of CVE-2017-6900

Vulnerability Description

The issue lies in the login script and wrongpass Python script, allowing for Bash command injection.
Passing a dash '-' as the username can trigger automatic login due to poor error handling.
Accessing /cgi-bin/login.cgi?username=-%20a URI can also lead to unauthorized login.

Affected Systems and Versions

Riello NetMan 204 versions 14-2 and 15-2 are affected.

Exploitation Mechanism

By manipulating the username parameter, attackers can gain administrative access and control over system services.

Mitigation and Prevention

Immediate Steps to Take

Enclose variables $VAL0 and $VAL1 in quotes when calling wrongpass.
Thoroughly check VAL0 and VAL1 for malicious characters to ensure data sanitization.

Long-Term Security Practices

Implement strong input validation to prevent command injection.
Regularly monitor and update authentication scripts for vulnerabilities.

Patching and Updates

Apply patches provided by the vendor to address the identified vulnerabilities.