CVE-2018-0197 : Vulnerability Insights and Analysis

A vulnerability in the VLAN Trunking Protocol (VTP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated attacker to corrupt the internal VTP database, leading to a denial of service (DoS) situation.

Understanding CVE-2018-0197

This CVE involves a flaw in the VLAN Trunking Protocol (VTP) subsystem of Cisco IOS and IOS XE Software, potentially enabling an attacker to disrupt VLAN operations.

What is CVE-2018-0197?

The vulnerability allows an unauthenticated attacker to corrupt the VTP database on a device, causing a DoS scenario. It stems from a logical error in handling VTP packets.

The Impact of CVE-2018-0197

The vulnerability could disrupt VLAN operations, affecting the ability to create, modify, or delete VLANs, leading to a DoS condition.

Technical Details of CVE-2018-0197

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw in the VTP subsystem of Cisco IOS and IOS XE Software allows nearby attackers to corrupt the internal VTP database, potentially leading to a DoS situation.

Affected Systems and Versions

Product: Cisco IOS and IOS XE Software
Vendor: Cisco
Vulnerable Version: 15.2(2)E6

Exploitation Mechanism

Attackers can exploit this vulnerability by sending VTP packets in a specific sequence that triggers a timeout in the VTP message processing code.

Mitigation and Prevention

Steps to address and prevent the CVE-2018-0197 vulnerability.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Configure VTP domain names on affected devices.

Long-Term Security Practices

Regularly monitor and update network security configurations.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Regularly check for security advisories from Cisco and apply recommended patches.