CVE-2018-0171 Explained : Impact and Mitigation

A weakness in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software allows a remote attacker to trigger a device reload or execute unauthorized commands, leading to a denial of service situation. The vulnerability arises from insufficient validation of packet data.

Understanding CVE-2018-0171

This CVE involves a vulnerability in Cisco IOS and IOS XE Software that can be exploited by an attacker to cause a denial of service or execute unauthorized commands on the affected device.

What is CVE-2018-0171?

The vulnerability in the Smart Install feature of Cisco IOS and IOS XE Software enables an attacker to reload a device remotely without authentication or execute unauthorized commands by sending a specially crafted Smart Install message to the device via TCP port 4786.

The Impact of CVE-2018-0171

Remote attacker can cause a device reload, leading to a denial of service situation
Unauthorized execution of commands on the affected device
Buffer overflow may occur, resulting in a watchdog crash and infinite loop

Technical Details of CVE-2018-0171

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability is caused by insufficient validation of packet data in the Smart Install feature of Cisco IOS and IOS XE Software.

Affected Systems and Versions

Product: Cisco IOS and IOS XE
Versions: Cisco IOS and IOS XE

Exploitation Mechanism

To exploit this vulnerability, the attacker needs to send a skillfully designed Smart Install message to the affected device via TCP port 4786. If successful, the attacker could cause a buffer overflow on the affected device, resulting in various consequences.

Mitigation and Prevention

Protecting systems from CVE-2018-0171 involves taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Disable the Smart Install feature if not needed
Implement infrastructure access control lists (iACLs) to restrict access to TCP port 4786
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch Cisco IOS and IOS XE Software
Conduct security assessments and audits to identify vulnerabilities
Educate users and administrators on best security practices

Patching and Updates

Apply the latest security patches and updates provided by Cisco to address the vulnerability.