Cisco warns of bug in desktop software

Cisco is warning users of a flaw in its Security Agent software that could be used to run unauthorized software on a Windows PC.

Cisco is advising Windows users of its Cisco Security Agent software to upgrade the product because of a security bug.

The flaw lies in a driver used by the client software. By sending maliciously crafted data to the PC, attackers could create a buffer overflow condition in the Windows kernel, causing the system to crash.

Security firm Secunia rates the crash flaw "moderately critical," but the vulnerability could be used by attackers to also run unauthorized software on the Windows machine, Cisco warned.

Cisco released hotfixes for the bug on Wednesday. A large number of Cisco products install this agent, including the Cisco Security Manager, Cisco Unified Communications Manager and the Cisco Voice Portal.

If attackers find a way to exploit this flaw to run code, it could become a serious security problem.

"Back in 2004, such a vulnerability would probably have led to a flurry of noisy network worms," wrote Daniel Wesemann, a handler with the SANS Internet Storm Center, in a blog posting. "Today, drive-by installs of spyware are more likely, but at least as damaging. The bottom line is still the same: If you are using the vulnerable component, patch as soon as possible."

The buffer overflow can be caused by sending a malicious TCP (Transmission Control Protocol) packet to ports 139 or 445, the ports used by the Microsoft Server Message Block file-sharing protocol.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Robert McMillan

IDG News Service
Show Comments

Cool Tech

Bang and Olufsen Beosound Stage - Dolby Atmos Soundbar

Learn more >

Toys for Boys

ASUS ROG, ACRONYM partner for Special Edition Zephyrus G14

Learn more >

Sony WF-1000XM3 Wireless Noise Cancelling Headphones

Learn more >

Nakamichi Delta 100 3-Way Hi Fi Speaker System

Learn more >

Family Friendly

Mario Kart Live: Home Circuit for Nintendo Switch

Learn more >

Philips Sonicare Diamond Clean 9000 Toothbrush

Learn more >

Stocking Stuffer

Teac 7 inch Swivel Screen Portable DVD Player

Learn more >

SunnyBunny Snowflakes 20 LED Solar Powered Fairy String

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?