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Privilege Escalation Vulnerability in Microsoft Windows SMB 

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Microsoft Windows (SMB protocol)

Overview

A vulnerability has been reported in Microsoft Windows Server Message Block (SMB) which could be exploited by an attacker to gain elevated privileges on the targeted system.

Target Audience:

All organizations and individuals using Microsoft Windows environments where SMB protocol is in use.

Risk Assessment:

High risk of privilege escalation and system compromise.

Impact Assessment:

Potential for data theft and system compromise.

Description

Microsoft Windows Server Message Block (SMB) is a network file sharing protocol used in Microsoft Windows environments. It enables applications and users to read and write to files and request services from server programs in a computer network.

This vulnerability exists due to improper validation in the SMB authentication. Successful exploitation of this vulnerability could allow an attacker to gain elevated privileges on the targeted system.

Solution

Apply appropriate updates as mentioned as mentioned by the Vendor:

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-55234

Vendor Information

Microsoft

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-55234

References

Microsoft

https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2025-55234

CVE Name

CVE-2025-55234

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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