CVE-2018-0174 : Exploit Details and Defense Strategies

A security weakness in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could lead to a denial of service (DoS) situation by allowing an unauthorized attacker to remotely restart affected devices.

Understanding CVE-2018-0174

This CVE involves a vulnerability in Cisco IOS and IOS XE software that could be exploited by attackers to cause a DoS condition.

What is CVE-2018-0174?

The vulnerability stems from inadequate validation of option 82 information in DHCPv4 packets, allowing attackers to send manipulated packets to force device restarts, resulting in a DoS scenario.

The Impact of CVE-2018-0174

Exploiting this weakness could lead to a denial of service situation by causing affected devices to restart remotely.

Technical Details of CVE-2018-0174

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS and IOS XE software allows unauthenticated attackers to reload affected devices, triggering a DoS condition.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers exploit incomplete input validation of option 82 information in DHCPv4 packets
Crafted DHCPv4 packets are sent to affected devices to force restarts

Mitigation and Prevention

Steps to address and prevent the CVE-2018-0174 vulnerability.

Immediate Steps to Take

Apply vendor-provided patches and updates promptly
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious DHCPv4 packets

Long-Term Security Practices

Regularly update and patch all network devices
Conduct security audits and assessments to identify vulnerabilities

Patching and Updates

Refer to Cisco's security advisory for specific patch details and instructions