CVE-2018-0197 Cisco IOS and IOS XE Software VLAN Trunking Protocol Denial of Service Vulnerability

Medium 6.5 Published 5 Oct 2018 Updated 26 Nov 2024

An adjacent attacker can cause a denial of service by sending crafted VTP packets to Cisco IOS devices in default server mode without a domain name.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-0197?

CVE-2018-0197 is a medium-severity denial of service vulnerability in Cisco Ios, published on 5 Oct 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the VLAN Trunking Protocol (VTP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to corrupt the internal VTP database on an affected device and cause a denial of service (DoS) condition. The vulnerability is due to a logic error in how the affected software handles a subset of VTP packets. An attacker could exploit this vulnerability by sending VTP packets in a sequence that triggers a timeout in the VTP message processing code of the affected software. A successful exploit could allow the attacker to impact the ability to create, modify, or delete VLANs and cause a DoS condition. There are workarounds that address this vulnerability. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS Software or Cisco IOS XE Software, are operating in VTP client mode or VTP server mode, and do not have a VTP domain name configured. The default configuration for Cisco devices that are running Cisco IOS Software or Cisco IOS XE Software and support VTP is to operate in VTP server mode with no domain name configured.

Weakness: CWE-20

Which versions are affected by CVE-2018-0197?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2018-0197?

No fix has been published for CVE-2018-0197 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-0197 being exploited?

There is no known exploitation of CVE-2018-0197 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-r7rx-2r34-f26f.