* CVE: CVE-2015-8772 * Vendor: McAfee - Intel Security * Reported by: Kyriakos Economou * Date of Release: 26/01/2016 * Date of Fix: N/A * Affected Products: Multiple * Affected Version: McPvDrv.sys v4.6.111.0 * Fixed Version: N/A Description: McAfee File Lock Driver does not handle correctly IOCTL_DISK_VERIFY IOCTL requests, which leads to kernel memory leak through specifically crafted IOCTLs. Normally the IOCTL_DISK_VERIFY IOCTL is used to verify an extent on a fixed disk and doesn't return any data. We have verified this issue in the latest McAfee File Lock v5.x which ships with McAfee total protection suite. However, other products that include this package will also be affected. Vulnerable module: McPvDrv.sys v4.6.111.0 Earlier versions of this kernel driver are probably affected by the same issue. Impact: A local attacker might be able to disclose sensitive information from kernel memory or crash the affected host. Technical Details: When we send an IOCTL_DISK_VERIFY IOCTL request the input buffer parameter of DeviceIoControl function must be a pointer to a VERIFY_INFORMATION data structure. typedef struct _VERIFY_INFORMATION { LARGE_INTEGER StartingOffset; DWORD Length; } VERIFY_INFORMATION, *PVERIFY_INFORMATION; The kernel memory leak is generated by the fact that the McPvDrv.sys driver doesn't validate the VERIFY_INFORMATION.Length which is controlled by our input buffer. Furthermore, the driver trusts that value as the size of the input buffer allocated in kernel space, causing the associated function to read data passed the size of the specified input buffer and read arbitrary data from kernel address space back to userland into a specified output buffer. Disclosure Log: Vendor Contacted: 16/09/2015 Request for feedback: 21/09/2015 - No response Request for feedback: 08/10/2015 - No response Request for feedback: 13/01/2016 - No response Public Disclosure: 26/01/2016 Copyright: Copyright (c) Nettitude Limited 2016, All rights reserved worldwide. Disclaimer: The information herein contained may change without notice. Any use of this information is at the user's risk and discretion and is provided with no warranties. Nettitude and the author cannot be held liable for any impact resulting from the use of this information. Kyriakos Economou Vulnerability Researcher [logo]<http://www.nettitude.co.uk/> P +44 (0) 845 520 0085 ext 1189 F +448455 200 222 keconomou@nettitude.com<mailto:keconomou@nettitude.com%0d> www.nettitude.co.uk<http://www.nettitude.co.uk/> Nettitude NEWS #Nettitude awarded MSSP of the Year by LogRhythm #Nettitude features on NBC<http://www.nettitude.com/nbc-interview/> [Nettitude Awards]<http://www.nettitude.com/> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nettitude Limited: 1 Jephson Court * Tancred Close * Leamington Spa * Warwickshire * CV31 3RZ Nettitude Inc: 85 Broad Street * 17th Floor * New York * NY10004 * EIN No.36-4694227 Twitter<https://twitter.com/Nettitude_com> * LinkedIn<http://uk.linkedin.com/company/nettitude-group> * Google Plus<https://plus.google.com/+Nettitude-penetrationtesting/posts> * FaceBook<https://www.facebook.com/Nettitude> * YouTube<http://www.youtube.com/channel/UCRUUESU5OTfRte0P-pm2MZQ> * Threat2Alert<http://www.threat2alert.com/> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LOVE REFERRALS - please pass our contact details on solutions@nettitude.com<mailto:solutions@nettitude.com>. Thank you! ______________________________________________________________________ This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. Nettitude employ a secure email policy for sending emails to customers. Should your email service support ESMTP, you will likely have received this email over TLS. We also utilise a backup secure service via Cisco Registered Envelope Service. For more information visit https://res.cisco.com/websafe/about This footnote also confirms that this email message has been swept by a content checking tool for the presence of computer viruses. Nettitude Limited is a Company registered in England Registered Address Nettitude Limited, 1 Jephson Court, Tancred Close, Leamington Spa, Warwickshire, CV31 3RZ Company Registration Number: 4705154 VAT Number: 184 5171 96 www.nettitude.com ______________________________________________________________________