CVE-2020-37130: Nsauditor 3.2.0.0 DoS Vulnerability

CVE-2020-37130 Overview

CVE-2020-37130 is a denial of service vulnerability affecting Nsauditor version 3.2.0.0. The vulnerability exists in the registration name input field and allows attackers to crash the application by supplying a malicious payload. Specifically, attackers can create a payload consisting of 1000 bytes of repeated characters which, when pasted into the registration name field, triggers a buffer overflow condition leading to an application crash.

Critical Impact

This buffer overflow vulnerability enables local attackers to crash Nsauditor through crafted input, causing denial of service and potential disruption to network auditing operations.

Affected Products

• Nsauditor 3.2.0.0
• Nsauditor Network Security Auditor (registration component)

Discovery Timeline

• 2026-02-05 - CVE-2020-37130 published to NVD
• 2026-02-05 - Last updated in NVD database

Technical Details for CVE-2020-37130

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. The root cause lies in the application's failure to properly validate the length of user input before copying it into a fixed-size memory buffer. When a user provides input exceeding the expected buffer size in the registration name field, the excess data overwrites adjacent memory, corrupting the application state and causing an immediate crash.

The attack requires local access to the system where Nsauditor is installed and user interaction to trigger the vulnerable code path through the registration dialog. While this limits the attack surface compared to remotely exploitable vulnerabilities, the impact results in complete loss of availability for the affected application.

Root Cause

The vulnerability stems from improper input validation in the registration name handling routine. The application allocates a fixed-size buffer to store the registration name but fails to implement boundary checks when copying user-supplied data. This classic buffer overflow condition (CWE-120) occurs when the input exceeds the allocated buffer space, causing memory corruption that leads to application termination.

Attack Vector

The attack vector is local, requiring an attacker to have access to the target system where Nsauditor is installed. The exploitation process involves:

1. Opening the Nsauditor application
2. Navigating to the registration dialog
3. Pasting a crafted payload of 1000 or more repeated characters into the registration name field
4. The application crashes upon processing the oversized input

The vulnerability is documented in Exploit-DB #48286, which provides detailed information about the exploitation technique. The attack requires no special privileges but does require user interaction to trigger the vulnerable code path.

Detection Methods for CVE-2020-37130

Indicators of Compromise

• Unexpected Nsauditor application crashes or process terminations
• Windows Event Log entries indicating application faults in nsauditor.exe
• Memory access violation errors related to the Nsauditor process
• Presence of unusually large text strings in clipboard history or input buffers

Detection Strategies

• Monitor for repeated Nsauditor application crashes through Windows Event Viewer
• Implement application crash monitoring solutions to detect abnormal termination patterns
• Review system logs for access violation or buffer overflow indicators associated with Nsauditor
• Deploy endpoint detection solutions capable of identifying buffer overflow attack patterns

Monitoring Recommendations

• Configure Windows Error Reporting to capture crash dumps for forensic analysis
• Enable detailed application logging where supported
• Monitor process stability metrics for Nsauditor installations across the environment
• Implement alerting for sudden application terminations on systems running network auditing tools

How to Mitigate CVE-2020-37130

Immediate Actions Required

• Evaluate continued use of Nsauditor 3.2.0.0 and consider alternative network auditing tools
• Restrict access to systems running the vulnerable Nsauditor version to trusted users only
• Implement application allowlisting to prevent unauthorized execution of Nsauditor
• Monitor vendor communications for security updates addressing this vulnerability

Patch Information

No vendor patch information is currently available in the NVD database for this vulnerability. Users should check the NSA Auditor official website for updated versions that may address this issue. Additional technical details and advisory information can be found at the VulnCheck Advisory on NSA Auditor.

Workarounds

• Avoid using the registration functionality until a patch is available
• Restrict clipboard functionality when interacting with the registration dialog
• Implement input filtering at the endpoint level to block excessively long text inputs
• Consider deploying the application in a sandboxed environment to contain potential crashes

Since no verified code examples are available, organizations should reference the Exploit-DB #48286 entry for technical details on the exploitation mechanism and develop appropriate detection signatures based on the documented attack patterns.