Cisco Catalyst 4500/Catalyst 4500-X BFD Message 7pk error

Summaryinfo

A vulnerability labeled as problematic has been found in Cisco Catalyst 4500 and Catalyst 4500-X. Affected by this issue is some unknown functionality of the component BFD Handler. Such manipulation as part of Message leads to 7pk error. This vulnerability is referenced as CVE-2018-0155. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability was found in Cisco Catalyst 4500 and Catalyst 4500-X (the affected version unknown) and classified as problematic. Affected by this issue is an unknown part of the component BFD Handler. The manipulation as part of a Message leads to a 7pk error vulnerability. Using CWE to declare the problem leads to CWE-388. Impacted is availability. CVE summarizes:

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.

The bug was discovered 03/28/2018. The weakness was published 03/28/2018 as cisco-sa-20180328-bfd as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. This vulnerability is handled as CVE-2018-0155 since 11/27/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 01/27/2025).

It is declared as attacked. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316222 (Cisco IOS and IOS XE Software Bidirectional Forwarding Detection Denial of Service Vulnerability(cisco-sa-20180328-bfd)). This issue was added on 03/03/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 03/17/2022:

Apply updates per vendor instructions.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 103565†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Cisco

Name

• Catalyst 4500
• Catalyst 4500-X

License

• commercial

Website

• Vendor: https://www.cisco.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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