Sign In with your
Trend Micro Account
Need Help?
Need More Help?

Create a technical support case if you need further support.

SECURITY BULLETIN: Weak File Permission Vulnerabilities in Trend Micro OfficeScan XG

    • Updated:
    • 4 Dec 2018
    • Product/Version:
    • OfficeScan XG.All
    • Platform:
    • Windows 10
Summary
Release Date: December 5, 2018
CVE Identifier(s): CVE-2018-18331, CVE-2018-18332
Platform(s): Windows
CVSS 3.0 Score(s): 5.9
Severity Rating(s): Medium

Trend Micro has released a new Critical Patch (CP) for Trend Micro OfficeScan XG.  This CP resolves two vulnerabilities related to weak file permissions.

Details
Public

Affected Version(s)

ProductAffected Version(s)PlatformLanguage(s)
OfficeScanXGWindowsEnglish

 

Solution

Trend Micro has released the following solutions to address the issue. Please note there is an additional step below to complete the necessary configuration:

ProductUpdated versionNotesPlatformAvailability
OfficeScanXG SP1 CP5261ReadmeWindowsAvailable Now

This is the minimum version(s) of the patch and/or build required to address the issue. Trend Micro highly encourages customers to obtain the latest version of the product if there is a newer one available than the one listed in this bulletin.

Customers are encouraged to visit Trend Micro’s Download Center to obtain prerequisite software (such as Service Packs) before applying any of the solutions above.

There is an additional step required to resolve these vulnerabilities after applying the CP if it has not already been performed after deploying a previous hotfix or patch. Please refer to the following steps below to be performed on the OfficeScan server.

 

Adding and Deploying the "PrivilegeContolSetting" in OfficeScan

1. Ensure that the OfficeScan Critical Patch (CP) has already been installed.
2. Open the "Ofcscan.ini" file (usually in the \PCCSRV folder of the OfficeScan installation directory) in a text editor.
3. If not already present, add the following key under the "Global Setting" section and set the value to "1":

 

[Global Setting]
PrivilegeContolSetting=1

 

4. Save the changes and close the file editor.
5. Open the OfficeScan web console and navigate to the "Agents > Global Agent Settings" section.
6. Click "Save" to confirm the settings and deploy the modified ofscan.ini settings to the agents.
7. If successful, the updated OfficeScan agents (client) should have the following regkey added:

 

Path: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\TrendMicro\PC-cillinNTCorp\CurrentVersion\Misc
Key: PrivilegeContolSetting
Type: REG_DWORD
Value: 1

 

Optional step: if this setting ever needs to be reversed, please follow the same procedure as above but change the value of "1" to "0" in step 3.

 

Vulnerability Details

This update resolves two vulnerabilities in Trend Micro OfficeScan XG:

1. CVE-2018-18331: Weak file permissions on a particular folder for a particular group may allow an attacker to alter the files, which could lead to other exploits.

2. CVE-2018-18332: Permissions on some key files can be potentially manipulated to modify other files and folders.

In addition to the two vulnerabilities discovered and addressed above, another potential issue was reported and is being given a Defense in Depth (DiD) credit:

3. *Defense in Depth (DiD) Credit: An attacker may attempt shutdown Trend Micro OfficeScan services or prevent them from running on startup using a specially crafted file on Windows 10. However, the attacker must already have obtained administrator privileges beforehand either legitimately or via a entirely different exploit. Please see the mitigating factors below for this issue since it is not completely addressed in the CP above.

Due to the seriousness of these vulnerabilities, customers are highly encouraged to update to the latest build as soon as possible.

Mitigating Factors

Exploiting these type of vulnerabilities generally require that an attacker has access (physical or remote) to a vulnerable machine. In addition to timely application of patches and updated solutions, customers are also advised to review remote access to critical systems and ensure policies and perimeter security is up-to-date.

* For the DiD Credit mentioned above, the current mitigation strategy is to ensure that administrator access on client machines are sufficently secured to legitmate users only to prevent such a scenario from happening. A malicious user with administrator or root level access on a client machine is capable of doing serious damage to the operating system itself and is not limited to applications - including OfficeScan. The OfficeScan product development team is currently evaluating how to better protect against an attack such as this while still respsecting the operating system privileges intended by the OS vendor.

However, even though an exploit may require several specific conditions to be met, Trend Micro strongly encourages customers to update to the latest builds as soon as possible.

 

Acknowledgement

Trend Micro would like to thank the following individuals for responsibly disclosing these issues and working with Trend Micro to help protect our customers:

 

External Reference(s)

Premium
Internal
Rating:
Category:
Configure; Upgrade; Update
Solution Id:
1121674
Feedback
Did this article help you?

Thank you for your feedback!

To help us improve the quality of this article, please leave your email here so we can clarify further your feedback, if neccessary:
We will not send you spam or share your email address.

*This form is automated system. General questions, technical, sales, and product-related issues submitted through this form will not be answered.

If you need additional help, you may try to contact the support team. Contact Support

To help us improve the quality of this article, please leave your email here so we can clarify further your feedback, if neccessary:
We will not send you spam or share your email address.

*This form is automated system. General questions, technical, sales, and product-related issues submitted through this form will not be answered.