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. ############################################################### This email originates from the systems of Portcullis Computer Security Limited, a Private limited company, registered in England in accordance with the Companies Act under number 02763799. The registered office address of Portcullis Computer Security Limited is: Portcullis House, 2 Century Court, Tolpits Lane, Watford, United Kingdom, WD18 9RS. The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Any opinions expressed are those of the individual and do not represent the opinion of the organisation. Access to this email by persons other than the intended recipient is strictly prohibited. If you are not the intended recipient, any disclosure, copying, distribution or other action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this email is subject to the terms and conditions expressed in the applicable Portcullis Computer Security Limited terms of business. ############################################################### ##################################################################################### This e-mail message has been scanned for Viruses and Content and cleared by MailMarshal. #####################################################################################