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K7 Computing Multiple Products K7FWFilt.sys Privilege Escalation

K7 Computing Multiple Products K7FWFilt.sys Privilege Escalation
Posted Dec 10, 2014
Authored by Kyriakos Economou | Site portcullis-security.com

Latest, and possibly earlier versions of K7FWFilt.sys kernel mode driver, also named as the 'K7Firewall Packet Driver', suffers from a heap overflow condition that can be exploited locally by an attacker in order to execute code with kernel privileges. Successful exploitation of this bug results in vertical privilege escalation.

tags | advisory, overflow, kernel
advisories | CVE-2014-7136
SHA-256 | 5f70f46819ed69a70be4689425f0203bacc85b239ad8f355847971ce2417afee

K7 Computing Multiple Products K7FWFilt.sys Privilege Escalation

Change Mirror Download
Vulnerability title: Privilege Escalation In K7 Computing Multiple Products [K7FWFilt.sys]
CVE: CVE-2014-7136
Vendor: K7 Computing
Product: Multiple Products [K7FWFilt.sys]
Affected version: Earlier and including 11.0.1.5
Fixed version: 14.0.1.16
Reported by: Kyriakos Economou
Details:

Latest, and possibly earlier versions of K7FWFilt.sys kernel mode driver, also named as the 'K7Firewall Packet Driver', suffers from a heap overflow condition that can be exploited locally by an attacker in order to execute code with kernel privileges. Successful exploitation of this bug results in vertical privilege escalation.

Technical Details:

The function handling IOCTL 0x830020C4 does not validate the size of the output buffer parameter passed in the DeviceIoControl API, which leads to a heap overflow on buffer data initialization. In particular, the function assumes that the output buffer has a size of 0x22C4 bytes. By declaring a smaller buffer we are able to overwrite other data and kernel objects that might follow and potentially control the execution flow via a corrupted kernel object.

ba31cb06 8b7d14 mov edi,dword ptr [ebp+14h] <--- EDI == allocated buffer
ba31cb09 ff7514 push dword ptr [ebp+14h]
ba31cb0c b9b1080000 mov ecx,8B1h <--- assume buffer size 0x8b1 * 4
ba31cb11 33c0 xor eax,eax <--- zero out EAX
ba31cb13 f3ab rep stos dword ptr es:[edi] <--- Heap Overflow

Further details at:

https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-7136/

Copyright:
Copyright (c) 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.


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