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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