Feeds

cPanel, Netgear and Linksys susceptible to nasty attack

Unholy trinity

Remote control for virtualized desktops

Defcon If you use cPanel to administer your website or certain Linksys or Netgear devices to route traffic over your wireless network, you're susceptible to web-based attacks that could take complete control of your systems, two security researchers said Saturday.

All three wares contain CSRF, or cross-site request forgery, holes that can be exploited when the user does nothing more than surf to the wrong site. Web-application security experts Russ McRee of HolisticInfoSec.org and Mike Bailey of Skeptikal.org said they've alerted officials at all three companies to the weaknesses and so far all have failed to fix them.

"CSRF is bad stuff," Bailey told a standing-room-only audience at the Defcon hacker conference in Las Vegas. "It's a very under-appreciated vulnerability, and it's all over the place. Because it usually gets rated as a pretty minimal issue, it almost never gets fixed, and that means that we have these kinds of holes all over."

CSRF attacks are web-based sleights of hand that exploit the trust sensitive web-based services have in users who have previously logged in. Third-party websites under the control of a CSRF attack permit these users to take actions they never intended, such as executing online financial transactions or revealing passwords. Because the user is already logged in, no password is necessary.

The vulnerability in cPanel is triggered by luring a user to a malicious website while logged in to the program, which is one of the most widely used web-hosting applications. The attack is able to trick cPanel into carrying out sensitive commands by making it appear as if they came from the victim.

"If you logged in as root and you hit my website or you hit any website I control, I can do anything I want," Bailey said. "I can reset your root password, I can upgrade software, I can modify any setting I want. That's scary and that's bad."

Even more troubling, Bailey continued, was the reply he got when he notified cPanel officials of the bug. "The response I got from cPanel was we can't fix this because it's a feature. Apparently, they're worried it's going to break integration with third party billing software, so they can't fix this."

Representatives from cPanel, Netgear and Linksys weren't immediately available for comment. This article will be updated if they can be reached and provide a response.

The CSRF attacks also affect the WRT160N model router made by Linksys. If you happen to be logged in to its administration page and surf to the wrong site, it can be hijacked. A similar vulnerability affects Netgear's RP614v4, said McRee, who posted a video available here that shows an exploit in action. What's more, because router vendors use the same code base across their product lineups, it's likely additional models are vulnerable, he said.

The attacks are difficult to prevent. While the NoScript extension for Firefox blocks a significant number of web-based attacks, Bailey described a now-fixed vulnerability in ESPN.com that could have allowed customer profiles to be hijacked that he said the plugin was powerless to stop.

Defcon attendee and security researcher Justin Samuel said a Firefox extension called RequestPolicy blocks the vast majority of CSRF attacks, and while we have no reason to doubt that, we haven't had a chance to verify the claim.

A longer-term and more comprehensive fix may come in the form of a specification proposed by the Mozilla foundation. It would allow banks, merchants and other organizations with sensitive websites to define certain security policies that would be carried out by the browser. For example, site developers could list an explicit set of domains allowed to issue javascript, so that code embedded in sites that aren't specifically white-listed would not be executed.

Other mitigation strategies that can help tame the CSRF (often pronounced "sea surf") menace include the use of CAPTCHAs and re-authentication scripts.

Of course, the best defense is for vendors to fix their buggy products, but as the researchers reported, that doesn't always happen. ®

Update

cPanel has published this response on its website that says in part: "Security is a top priority for cPanel. In an upcoming update to cPanel, new technology will be provided to mitigate CSRF attacks against cPanel’s products. This new security feature is currently undergoing critical quality assurance testing and will be released once verified."

The company reminds users to protect themselves by taking the following measures:

  • Do not remain logged into any web applications or interfaces while browsing untrusted sites. Always completely log out of browser sessions for sensitive sites when activities have been completed.
  • Avoid opening SPAM, Websites, or clicking on links that you do not trust especially URL shortening services found on many social media sites.
  • Update your current passwords within cPanel on a regular basis and maintain strong password discipline.

Top 5 reasons to deploy VMware with Tegile

More from The Register

next story
Regin: The super-spyware the security industry has been silent about
NSA fingered as likely source of complex malware family
Why did it take antivirus giants YEARS to drill into super-scary Regin? Symantec responds...
FYI this isn't just going to target Windows, Linux and OS X fans
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Home Office: Fancy flogging us some SECRET SPY GEAR?
If you do, tell NOBODY what it's for or how it works
HACKERS can DELETE SURVEILLANCE DVRS remotely – report
Hikvision devices wide open to hacking, claim securobods
'Regin': The 'New Stuxnet' spook-grade SOFTWARE WEAPON described
'A degree of technical competence rarely seen'
Syrian Electronic Army in news site 'hack' POP-UP MAYHEM
Gigya redirect exploit blamed for pop-rageous ploy
Astro-boffins start opening universe simulation data
Got a supercomputer? Want to simulate a universe? Here you go
prev story

Whitepapers

10 ways wire data helps conquer IT complexity
IT teams can automatically detect problems across the IT environment, spot data theft, select unique pieces of transaction payloads to send to a data source, and more.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
How to determine if cloud backup is right for your servers
Two key factors, technical feasibility and TCO economics, that backup and IT operations managers should consider when assessing cloud backup.
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.
Mitigating web security risk with SSL certificates
Web-based systems are essential tools for running business processes and delivering services to customers.