Feeds

Win-NT, 2K debug process gives up control

Got root?

  • alert
  • submit to reddit

New hybrid storage solutions

A security hole in Win-NT and 2K could enable an attacker to take control by exploiting a flaw in the debugging subsystem (SMSS). Radim "EliCZ" Picha has demonstrated that it's possible for an unprivileged user to execute debug processes in the System context.

At issue is an exploitable LPC (Local Procedure Call) port, to which any user or process has access. By exploiting the LPC flaw, an attacker can bypass the CSRSS (Client Server Runtime Subsystem) and avoid the normal privilege restrictions for debug commands.

According to a recent posting to the BugTraq mailing list, an attacker would cause SMSS.exe to duplicate a handle to the target, which can be any running process. He connects to the debug LPC, requests CreateProcess SsApi with the target's client ID, receives the duplicated handle, and owns the box. At this point the attacker can execute external programs in the System account.

A working exploit called DebPloit with source code is located here, so you can verify the vulnerability.

MS hasn't managed to patch it yet, but has managed to complain that the exploit was released without its approval. In the mean time, the author of the BugTraq post also provides a hotfix which he says will make the LPC port available only to processes running in the System account. Both items are mirrored here as well.

We haven't verified either of these files, so check them out thoroughly before mucking about with critical systems. ®

Security for virtualized datacentres

More from The Register

next story
Not appy with your Chromebook? Well now it can run Android apps
Google offers beta of tricky OS-inside-OS tech
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
NHS grows a NoSQL backbone and rips out its Oracle Spine
Open source? In the government? Ha ha! What, wait ...?
Google extends app refund window to two hours
You now have 120 minutes to finish that game instead of 15
Intel: Hey, enterprises, drop everything and DO HADOOP
Big Data analytics projected to run on more servers than any other app
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.