Jan 25, 2017
John
Comments Off on VU#535111: McAfee VirusScan Enterprise for Windows scriptproxy COM object memory corruption vulnerability

VU#535111: McAfee VirusScan Enterprise for Windows scriptproxy COM object memory corruption vulnerability

Vulnerability Note VU#535111

McAfee VirusScan Enterprise for Windows scriptproxy COM object memory corruption vulnerability

Original Release date: 13 Dec 2016 | Last revised: 19 Dec 2016

Overview

McAfee VirusScan Enterprise for Windows scriptproxy COM object contains a memory corruption vulnerability.

Description

According to the reporter, McAfee VirusScan Enterprise for Windows version 8.7i through at least 8.8 patch 7 contains a scriptproxy COM object that is vulnerable to the following:

CWE-824: Access of Uninitialized Pointer

According to the reporter, when attempting to load the McAfee VirusScan Enterprise scriptproxy COM object DLL via CLSID in an HTML document through Internet Explorer, the DLL may crash in such a way as to cause an access violation on the instruction pointer, which may lead to denial of service.

The CERT/CC has not received a CVE ID assignment from McAfee for this issue at this time. Intel Security, which owns McAfee, has provided the following response:

Intel Security takes any claim of this kind very seriously. We have requested and are awaiting the information we require to conduct our assessment. We look forward to receiving this information.
The CERT/CC has independently confirmed this issue in McAfee VirusScan Enterprise 8.8 patch 7 on Internet Explorer 11 for Windows 7 and reported details to McAfee in June 2016. It is unclear if other versions of Internet Explorer are also affected. The CERT/CC will continue to work with Intel Security/McAfee to address this issue.

This issue was originally published as part of VU#245327, but was later moved to its own Vulnerability Note to prevent product confusion.

Impact

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to cause a denial of service.

Solution

The CERT/CC is currently unaware of a practical solution to this problem. However, affected users may consider the following workaround:
Disable the McAfee ActiveX control in Internet Explorer

The vulnerable McAfee ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSID:
{7DB2D5A0-7241-4E79-B68D-6309F01C5231}More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{7DB2D5A0-7241-4E79-B68D-6309F01C5231}] "Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftInternet ExplorerActiveX Compatibility{7DB2D5A0-7241-4E79-B68D-6309F01C5231}] "Compatibility Flags"=dword:00000400

Vendor Information (Learn More)

Vendor Status Date Notified Date Updated
McAfee Affected 08 Jun 2016 19 Dec 2016

If you are a vendor and your product is affected, let
us know
.

CVSS Metrics (Learn More)

Group Score Vector
Base 7.6 AV:N/AC:H/Au:N/C:C/I:C/A:C
Temporal 6.1 E:U/RL:U/RC:UR
Environmental 4.6 CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

Credit

Thanks to Shelby Kaba for reporting this issue to us.

This document was written by Garret Wassermann.

Other Information

  • CVE IDs:
    Unknown
  • Date Public:
    12 Dec 2016
  • Date First Published:
    13 Dec 2016
  • Date Last Updated:
    19 Dec 2016
  • Document Revision:
    46

Feedback

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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