Feeds

Cisco high-end routers in DoS peril

12000 series flaw is causing ISP pain

  • alert
  • submit to reddit

5 things you didn’t know about cloud backup

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. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
Ice cream headache as black hat hacks sack Dairy Queen
I scream, you scream, we all scream 'DATA BREACH'!
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
JLaw, Kate Upton exposed in celeb nude pics hack
100 women victimised as Apple iCloud accounts reportedly popped
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
Attack flogged through shiny-clicky social media buttons
66,000 users popped by malicious Flash fudging add-on
New Snowden leak: How NSA shared 850-billion-plus metadata records
'Federated search' spaffed info all over Five Eyes chums
Three quarters of South Korea popped in online gaming raids
Records used to plunder game items, sold off to low lifes
Oz fed police in PDF redaction SNAFU
Give us your metadata, we'll publish your data
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Advanced data protection for your virtualized environments
Find a natural fit for optimizing protection for the often resource-constrained data protection process found in virtual environments.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.