CVE-2018-25228: NetSetMan Buffer Overflow DoS Vulnerability

CVE-2018-25228 Overview

CVE-2018-25228 is a buffer overflow vulnerability (CWE-787: Out-of-bounds Write) affecting NetSetMan version 4.7.1. The vulnerability exists in the Workgroup feature and allows local attackers to crash the application by supplying oversized input. Attackers can create a malicious configuration file with excessive data and paste it into the Workgroup field to trigger a denial of service condition.

Critical Impact

Local attackers can exploit this buffer overflow to cause application crashes and denial of service, disrupting network configuration management operations on affected systems.

Affected Products

• NetSetMan 4.7.1

Discovery Timeline

• 2026-03-30 - CVE CVE-2018-25228 published to NVD
• 2026-03-30 - Last updated in NVD database

Technical Details for CVE-2018-25228

Vulnerability Analysis

This vulnerability is classified as an out-of-bounds write (CWE-787), a type of buffer overflow where the application writes data beyond the boundaries of the allocated memory buffer. In the case of NetSetMan 4.7.1, the Workgroup field does not properly validate the length of user-supplied input before copying it into a fixed-size buffer.

When an attacker pastes an oversized string into the Workgroup field (either manually or through a malicious configuration file), the application attempts to store this data without performing adequate bounds checking. This results in memory corruption that leads to an application crash. While the current exploitation scenario demonstrates a denial of service condition, buffer overflows of this nature can potentially be leveraged for more severe attacks depending on the memory layout and exploitation conditions.

Root Cause

The root cause of CVE-2018-25228 is improper input validation in the Workgroup field processing routine. The application fails to enforce appropriate length limits on user input before storing it in memory. This allows an attacker to provide input that exceeds the expected buffer size, causing the application to write beyond the allocated memory region and corrupt adjacent data structures.

Attack Vector

The attack requires local access to the system running NetSetMan 4.7.1. An attacker can exploit this vulnerability by:

1. Creating a malicious configuration file containing an oversized string for the Workgroup parameter
2. Opening NetSetMan and importing or pasting the malicious configuration data
3. The application processes the oversized input without proper bounds checking
4. A buffer overflow occurs when the data is written to memory, causing the application to crash

The attack does not require any user interaction beyond the initial import/paste action, and no special privileges are needed to trigger the vulnerability. For technical details and proof-of-concept information, see the Exploit-DB #46417 entry.

Detection Methods for CVE-2018-25228

Indicators of Compromise

• Unexpected NetSetMan application crashes, particularly when loading configuration files
• Windows Application Event Log entries showing netsetman.exe crashes with access violation errors
• Presence of unusually large .nss configuration files or configuration data with extremely long Workgroup field values

Detection Strategies

• Monitor for NetSetMan process crashes using Windows Event Log analysis
• Implement file integrity monitoring on NetSetMan configuration directories to detect suspicious configuration file modifications
• Deploy endpoint detection capabilities that can identify buffer overflow exploitation attempts and abnormal process termination patterns

Monitoring Recommendations

• Configure centralized logging for Windows application crash events related to netsetman.exe
• Establish baseline behavior for NetSetMan usage patterns and alert on deviations
• Monitor for the creation or modification of NetSetMan configuration files from unexpected sources or user accounts

How to Mitigate CVE-2018-25228

Immediate Actions Required

• Upgrade NetSetMan to the latest available version from the official NetSetMan website
• Restrict file system access to NetSetMan configuration directories to prevent malicious configuration file injection
• Validate all imported configuration files before loading them into NetSetMan
• Implement application whitelisting to control which users and processes can interact with NetSetMan

Patch Information

Users should check the official NetSetMan website for the latest version that addresses this buffer overflow vulnerability. See the VulnCheck Advisory: NetSetMan DoS for additional technical details and remediation guidance.

Workarounds

• Avoid importing configuration files from untrusted sources
• Implement strict access controls on systems running NetSetMan to limit local access by untrusted users
• Consider deploying application isolation or sandboxing technologies to contain potential exploitation impacts
• Monitor and limit clipboard operations that could be used to paste malicious data into the Workgroup field