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SECURITY BULLETIN: Trend Micro IM Security Weak Session Token Authentication Bypass Vulnerability

    • Updated:
    • 7 May 2021
    • Product/Version:
    • Instant Messaging Security 1.6
    • Instant Messaging Security 1.6.5
    • Platform:
Summary
Release Date: May 6, 2021
CVE Identifier(s): CVE-2021-31520
Platform(s): Windows
CVSS 3.0 Score(s): 7.3
Severity Rating(s): High

Trend Micro has released Critical Patches (CPs) for IM Security 1.6+.  These CPs resolve a weak session token authentication bypass vulnerability in the product.

Details
Public

Affected Version(s)

ProductAffected Version(s)PlatformLanguage(s)
IM SecurityVersion 1.6.5WindowsEnglish
Version 1.6WindowsEnglish

Solution

Trend Micro has released the following solutions to address the issue:

ProductUpdated versionNotesPlatformAvailability
IM SecurityVersion 1.6.5 CP3 (b2110)ReadmeWindowsNow Available
Version 1.6 CP3 (b1267)ReadmeWindowsNow Available

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.

Vulnerability Details

CVE-2021-31520: Trend Micro IM Security Weak Session Token Authentication Bypass Vulnerability
CVSSv3: 7.3 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
A weak session token authentication bypass vulnerability in Trend Micro IM Security 1.6 and 1.6.5 could allow an remote attacker to guess currently logged-in administrators' session session token in order to gain access to the product's web management interface.

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 - including admin logout sessions.

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)

ZDI-21-525
Premium
Internal
Partner
Rating:
Category:
Update
Solution Id:
000286439
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