Cisco Wireless LAN Controller Network Processing Unit traffic denial of service

cisco-wlc-npu-traffic-dos (33609) The risk level is classified as MediumMedium Risk

Description:

Cisco Wireless LAN Controller (WLC) could allow a remote attacker on a local wireless network segment to cause a denial of service. By sending specially-crafted SNAP packets, 802.11 traffic, or packets containing values with unexpected lengths in certain headers, a remote attacker could cause the controller NPUs to lock.

NOTE: Devices with WLC functionality provided by software are not affected by this vulnerability.

*CVSS:

Base Score: 5
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 4.1
  Exploitability: Functional
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to cisco-sa-20070412-wlc for upgrade information. See References.

References:

  • cisco-sa-20070412-wlc: Cisco Security Advisory: Multiple Vulnerabilities in the Cisco Wireless LAN Controller and Cisco Lightweight Access Points.
  • BID-23461: Cisco Wireless Lan Controller Multiple Remote Vulnerabilities
  • CVE-2007-2038: The Network Processing Unit (NPU) in the Cisco Wireless LAN Controller (WLC) before 3.2.193.5, 4.0.x before 4.0.206.0, and 4.1.x allows remote attackers on a local wireless network to cause a denial of service (loss of packet forwarding) via (1) crafted SNAP packets, (2) malformed 802.11 traffic, or (3) packets with certain header length values, aka Bug ID CSCsg36361.
  • CVE-2007-2039: The Network Processing Unit (NPU) in the Cisco Wireless LAN Controller (WLC) before 3.2.171.5, 4.0.x before 4.0.206.0, and 4.1.x allows remote attackers on a local wireless network to cause a denial of service (loss of packet forwarding) via (1) crafted SNAP packets, (2) malformed 802.11 traffic, or (3) packets with certain header length values, aka Bug IDs CSCsg15901 and CSCsh10841.
  • OSVDB ID: 34136: Cisco Wireless LAN Controller (WLC) Network Processing Unit (NPU) Crafted SNAP Packet DoS
  • OSVDB ID: 34137: Cisco Wireless LAN Controller (WLC) Network Processing Unit (NPU) Malformed 802.11 Traffic DoS
  • OSVDB ID: 34139: Cisco Wireless LAN Controller (WLC) Network Processing Unit (NPU) Malformed Header Length DoS
  • SECTRACK ID: 1017908: Cisco Wireless LAN Controller Lets Remote Users Modify the Configuration and Deny Service
  • VUPEN/ADV-2007-1368: Cisco Wireless LAN Controller Security Bypass and Denial of Service Vulnerabilities

Platforms Affected:

  • Cisco Wireless LAN Controller 3.2
  • Cisco Wireless LAN Controller 4.0
  • Cisco Wireless LAN Controller 4.1

Reported:

Apr 12, 2007

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