SB2025061079 - Multiple vulnerabilities in Microsoft Windows SMB Client

Description

This security bulletin contains information about 2 vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2025-32718)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow in Windows SMB Client. A local user can pass specially crafted data to the application, trigger integer overflow and execute arbitrary code on the target system with elevated privileges.

2) Improper access control (CVE-ID: CVE-2025-33073)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Green

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in Windows SMB Client. A remote user can bypass implemented security restrictions and gain elevated privileges on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-32718
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-33073