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Cisco warns products are carrying DoS vunerabilities

Cisco warns products are carrying DoS vunerabilities

The vendor has issued a public notice about confirmed vulnerabilities in several of its product series

A number of Cisco products are carrying denial of service (DoS) vulnerabilities which could result in system crashes.

According to a public advisory notice from the vendor, seven product ranges are susceptible to DoS attacks that manipulate the state of transmission control protocol (TCP) connections. Through these vulnerabilities, assailants can force a number of TCP connections to remain in a long-lived state indefinitely, consuming system resources and preventing new connections to be made.

According to the Cisco notice, this issue can sometimes be resolved with a reboot.

Cisco Nexus 5000 devices were flagged to have a TCP DoS opening that can crash a system through receiving a specific sequence of TCP packets.

Confirmed affected product lines are:

  • Cisco IOS Software
  • Cisco IOS-XE Software
  • Cisco IOS-XE Software
  • Cisco Adaptive Security Appliance (ASA) and Cisco PIX
  • Cisco NX-OS Software
  • Scientific Atlanta Products
  • Linksys Products

The vendor has released a free software update that addresses the problem, which can be found on Cisco’s website with workarounds available as well.

Cisco has also released a list of confirmed safe product lines:

  • Cisco IOS XR
  • Cisco IOS Software Modularity
  • Cisco ASA Software version 8.2
  • Cisco PIX Software version 6.x and earlier
  • Cisco Firewall Services Module (FWSM)
  • Cisco Multilayer Distribution Switches (MDS)
  • Cisco Application Control Engine (ACE) Modules and Appliances
  • Cisco ACE XML Gateway
  • Cisco Access Control Server (ACS) Solution Engine
  • Cisco Guard
  • Cisco Security Monitoring, Analysis, and Response System (CS-MARS)
  • Cisco ONS 15000
  • Cisco Content Services Switches (CSS)
  • Cisco Wide Area Application Services (WAAS)
  • Cisco Wireless LAN Controller (WLC)
  • IronPort C, M, S and X Series Appliances

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