Feeds

Cisco high-end routers in DoS peril

12000 series flaw is causing ISP pain

  • alert
  • submit to reddit

Providing a secure and efficient Helpdesk

Cisco has issued a fix for a flaw which potentially makes its high-end routers susceptible to denial of service attacks.

The performance of Cisco 12000 series routers can be degraded when they have to send a large number of Internet Control Message Protocol (ICMPs) unreachable packets, something that usually happens as a result of heavy network scanning.

In an advisory on the issue, Cisco spells out the potential gravity of the problem and also admits some ISPs "have (been) experiencing difficulties" due to the vulnerability.

"Exploitation of this vulnerability may lead to Denial-of-Service. The router's performance will degrade and, in the worst case scenario, the router will stop forwarding packets," the notice states.

The problem is restricted to certain line cards in Cisco high-end 12000 series routers.

Cisco has suggested workarounds which involve either preventing a router from sending ICMP unreachable packets at all, or rate-limiting them.

It has also provided a schedule for updates to its IOS software that will provide a more complete solution to the problem. Since this availability is dependant on the underlying technology (or engine) an individual line card is based upon, service provider users will have to first determine this before looking up what they need to do.

A less serious problem means that one of four 'engines' that underpin line cards used in the 12000 series has a series of six vulnerabilities involving the implementation of Access Control Lists. Cisco has published an advisory which informs users how to deal with the problem here. ®

New hybrid storage solutions

More from The Register

next story
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
Google recommends pronounceable passwords
Super Chrome goes into battle with Mr Mxyzptlk
Infosec geniuses hack a Canon PRINTER and install DOOM
Internet of Stuff securo-cockups strike yet again
Reddit wipes clean leaked celeb nudie pics, tells users to zip it
Now we've had all THAT TRAFFIC, we 'deplore' this theft
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
TorrentLocker unpicked: Crypto coding shocker defeats extortionists
Lousy XOR opens door into which victims can shove a foot
Greater dev access to iOS 8 will put us AT RISK from HACKERS
Knocking holes in Apple's walled garden could backfire, says securo-chap
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Top 5 reasons to deploy VMware with Tegile
Data demand and the rise of virtualization is challenging IT teams to deliver storage performance, scalability and capacity that can keep up, while maximizing efficiency.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.