Severity

High

Analysis Summary

CVE-2018-0155

A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to cause a crash of the iosd process, causing a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when the BFD header in a BFD packet is incomplete. An attacker could exploit this vulnerability by sending a crafted BFD message to or across an affected switch. A successful exploit could allow the attacker to trigger a reload of the system.

Impact

• Denial of Service

Affected Vendors

Cisco

Affected Products

• Catalyst 4500 Supervisor Engine 6-E
• Catalyst 4500 Supervisor Engine 6L-E (K10)
• Catalyst 4500 Supervisor Engine 7-E
• Catalyst 4500 Supervisor Engine 7L-E
• Catalyst 4500E Supervisor Engine 8-E
• Catalyst 4500E Supervisor Engine 8L-E
• Catalyst 4500E Supervisor Engine 9-E
• Catalyst 4500-X Series Switches
• Catalyst 4900M Switch
• Catalyst 4948E Ethernet Switch

Remediation

Refer to Cisco advisory for the complete list of affected product and their respective patches.

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd