CVE-2017-20002 : Vulnerability Insights and Analysis

In the Debian Shadow package version prior to 1:4.5-1, a vulnerability exists where local users can log in without a password, potentially escalating privileges.

Understanding CVE-2017-20002

This CVE describes a security issue in the Debian Shadow package that allows local users to bypass password requirements.

What is CVE-2017-20002?

The vulnerability in the Debian Shadow package version prior to 1:4.5-1 allows local users to log in without a password, even when connected through non-physical methods like SSH.

The Impact of CVE-2017-20002

This vulnerability can lead to unauthorized access and privilege escalation for local users, particularly in environments like virtual machines with default blank root passwords.

Technical Details of CVE-2017-20002

The technical aspects of the CVE-2017-20002 vulnerability are as follows:

Vulnerability Description

The file /etc/securetty incorrectly includes pts/0 and pts/1 as physical terminals, enabling local users to log in without a password.

Affected Systems and Versions

Debian Shadow package version prior to 1:4.5-1

Exploitation Mechanism

Local users exploit the misconfiguration in /etc/securetty to gain unauthorized access without a password.

Mitigation and Prevention

To address CVE-2017-20002, consider the following steps:

Immediate Steps to Take

Update the Debian Shadow package to version 1:4.5-1 or later
Monitor and restrict local user access

Long-Term Security Practices

Implement strong password policies
Regularly review and update system configurations

Patching and Updates

Apply security patches promptly