Cisco CBOS large DHCP packet denial of service

cisco-cbos-dhcp-dos (9151) The risk level is classified as MediumMedium Risk

Description:

Cisco 600 series routers running CBOS (Cisco Broadband Operating System) is vulnerable to a denial of service attack, caused by improper handling of packets sent to the Dynamic Host Configuration Protocol (DHCP) port. A remote attacker could send a large packet to the DHCP port, which is enabled by default, to cause the customer premises equipment (CPE) to stop functioning.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of CBOS (2.4.5 or later), as listed in Cisco Security Advisory: CBOS - Improving Resilience to Denial-of-Service Attacks. See References.

References:

Platforms Affected:

  • Cisco Broadband Operating System 2.0.1
  • Cisco Broadband Operating System 2.1.0
  • Cisco Broadband Operating System 2.1.0A
  • Cisco Broadband Operating System 2.2.0
  • Cisco Broadband Operating System 2.2.1
  • Cisco Broadband Operating System 2.2.1A
  • Cisco Broadband Operating System 2.3
  • Cisco Broadband Operating System 2.3.053
  • Cisco Broadband Operating System 2.3.2
  • Cisco Broadband Operating System 2.3.5
  • Cisco Broadband Operating System 2.3.5.015
  • Cisco Broadband Operating System 2.3.7
  • Cisco Broadband Operating System 2.3.7.002
  • Cisco Broadband Operating System 2.3.8
  • Cisco Broadband Operating System 2.3.9
  • Cisco Broadband Operating System 2.4.1
  • Cisco Broadband Operating System 2.4.2
  • Cisco Broadband Operating System 2.4.2AP
  • Cisco Broadband Operating System 2.4.2B
  • Cisco Broadband Operating System 2.4.3
  • Cisco Broadband Operating System 2.4.4

Reported:

May 23, 2002

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