CVE-2018-0155 Information

Description

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. This vulnerability affects Catalyst 4500 Supervisor Engine 6-E (K5) Catalyst 4500 Supervisor Engine 6L-E (K10) Catalyst 4500 Supervisor Engine 7-E (K10) Catalyst 4500 Supervisor Engine 7L-E (K10) Catalyst 4500E Supervisor Engine 8-E (K10) Catalyst 4500E Supervisor Engine 8L-E (K10) Catalyst 4500E Supervisor Engine 9-E (K10) Catalyst 4500-X Series Switches (K10) Catalyst 4900M Switch (K5) Catalyst 4948E Ethernet Switch (K5). Cisco Bug IDs: CSCvc40729.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Reference

http://www.securityfocus.com/bid/103565 http://www.securitytracker.com/id/1040587 https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05 https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

8.6