New Windows privilege escalation flaw exploited in active attacks

A vulnerability in Windows XP and Windows Server 2003 is exploited with a flaw in Adobe Reader in a new attack, researchers at FireEye said

Attackers are exploiting a new and unpatched vulnerability in Windows XP and Windows Server 2003 that allows them to execute code with higher privileges than they have access to.

The vulnerability is located in NDProxy.sys, "a system-provided driver that interfaces WAN miniport drivers, call managers, and miniport call managers to the Telephony Application Programming Interfaces (TAPI) services."

"An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode," Microsoft said in a security advisory published Wednesday. "An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights."

This is an elevation-of-privilege (EoP) vulnerability, not a remote code execution one, which means that attackers need to already have access to a low-privileged account on the targeted system in order to exploit it.

According to Microsoft, this vulnerability is already being exploited in "limited, targeted attacks," but doesn't affect Windows versions newer than Windows XP and Windows Server 2003.

The company provided a temporary workaround that involves disabling NDProxy.sys, but this will cause certain services which depend on TAPI, like Remote Access Service (RAS), dial-up networking and virtual private networking (VPN), to no longer work.

Microsoft credited security vendor FireEye with helping the company investigate the new vulnerability, which is being tracked as CVE-2013-5065.

This EoP vulnerability is being exploited in attacks in conjunction with a remote code execution vulnerability in older versions of Adobe Reader that was patched in May, FireEye security researchers Xiaobo Chen and Dan Caselden said Wednesday in a blog post. The exploit targets computers running Adobe Reader on Windows XP with Service Pack 3, but users who have the latest versions of Adobe Reader installed should be protected, they said.

According to the FireEye researchers, if the exploit is successful, an executable file is dropped in the Windows temporary directory and is executed.

However, FireEye did not immediately respond to an inquiry seeking more information about how the exploit is being distributed, whether there are any specific targets, or the nature of the rogue file executed on vulnerable computers.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

Tags intrusionMicrosoftsecurityadobeFireEyeExploits / vulnerabilitiesmalware

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Lucian Constantin

IDG News Service
Show Comments

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Kurt Hegetschweiler

Brother PocketJet PJ-773 A4 Portable Thermal Printer

It’s perfect for mobile workers. Just take it out — it’s small enough to sit anywhere — turn it on, load a sheet of paper, and start printing.

Matthew Stivala

HP OfficeJet 250 Mobile Printer

The HP OfficeJet 250 Mobile Printer is a great device that fits perfectly into my fast paced and mobile lifestyle. My first impression of the printer itself was how incredibly compact and sleek the device was.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?