Vulnerability title: Denial Of Service In PCNetSoftware RAC Server

CVE: CVE-2014-2597
Vendor: PCNetSoftware
Product: RAC Server
Affected version: 4.0.4, 4.0.5
Fixed version: N/A
Reported by: Kyriakos Economou

Details:

Latest and possibly earlier versions of RAC Server are vulnerable to local DoS attacks that can either disable the keyboard input or to kill the system through a BSoD, by sending specific IOCTL requests to RACDriver.sys kernel mode driver. The attacker can choose between the two.

For example, a BSoD can be triggered because the size of the input buffer received by the driver is not correctly validated against the size of a static buffer, inside the driver module itself, from where the driver transfers some data to the allocated buffer.

The vulnerable function assumes that the size of the input buffer will always be less or equal to the static one.
This leads to memory access violation inside the kernel address space when the input buffer is too big, because the vulnerable function will attempt to read outside the module itself.

Impact:

This vulnerability causes Denial of Service by disabling the keyboard or triggering a Blue Screen of Death.

Exploit:

The proof of concept exploit is available.

Vendor status:

13/02/2014 Advisory created
21/02/2014 Vendor contacted
07/03/2014 Vendor contact reattempted
25/03/2014 CVE obtained
11/04/2014 Published
Copyright:

Copyright © Portcullis Computer Security Limited 2014, All rights reserved worldwide. Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited.

Disclaimer:

The information herein contained may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user’s risk. In no event shall the author/distributor (Portcullis Computer Security Limited) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

Related Resources