CVE-2020-37197: Dnss Domain Name Search Software DoS Flaw

CVE-2020-37197 Overview

CVE-2020-37197 is a buffer overflow vulnerability in Dnss Domain Name Search Software that allows attackers to crash the application by overflowing the 'Name' input field. This denial of service vulnerability can be triggered when an attacker generates a 1000-character buffer payload and pastes it into the registration name field, causing the application to crash unexpectedly.

Critical Impact

Local attackers can cause application crashes through buffer overflow in the Name input field, disrupting domain name search operations.

Affected Products

• Dnss Domain Name Search Software

Discovery Timeline

• 2026-02-11 - CVE CVE-2020-37197 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2020-37197

Vulnerability Analysis

This vulnerability stems from CWE-120 (Buffer Copy without Checking Size of Input), commonly known as Classic Buffer Overflow. The Dnss Domain Name Search Software fails to properly validate the length of user-supplied input in the registration name field before copying it to a fixed-size buffer. When an attacker supplies input exceeding the expected buffer size (approximately 1000 characters), the application writes beyond the allocated memory boundaries, corrupting adjacent memory and causing the application to crash.

The attack requires local access and user interaction, as the malicious payload must be pasted directly into the application's registration interface. While the impact is limited to availability (denial of service), this type of vulnerability could potentially be leveraged for more severe attacks if memory layout conditions are favorable.

Root Cause

The root cause is improper bounds checking on the 'Name' input field in the registration functionality. The application allocates a fixed-size buffer to store user input but does not verify that the input length fits within the allocated space before performing the copy operation. This classic buffer overflow condition (CWE-120) allows data to overflow into adjacent memory regions, corrupting application state and triggering a crash.

Attack Vector

The attack vector is local, requiring the attacker to have access to the system where Dnss Domain Name Search Software is installed. The exploitation process involves:

1. The attacker creates a payload consisting of approximately 1000 or more characters
2. The attacker opens the Dnss Domain Name Search Software application
3. The attacker navigates to the registration interface
4. The payload is pasted into the 'Name' input field
5. Upon processing, the buffer overflow occurs, causing immediate application crash

The vulnerability requires user interaction as the payload must be actively entered into the application interface. Technical details of the exploitation methodology can be found in the Exploit-DB #47861 advisory.

Detection Methods for CVE-2020-37197

Indicators of Compromise

• Unexpected crashes or termination of Dnss Domain Name Search Software processes
• Application error logs showing memory access violations or segmentation faults
• Unusually long strings in registration-related log entries or input fields

Detection Strategies

• Monitor for repeated application crashes in Dnss Domain Name Search Software
• Implement application-level logging to capture input field contents and flag oversized inputs
• Deploy endpoint detection rules to identify buffer overflow attack patterns targeting desktop applications

Monitoring Recommendations

• Enable crash reporting and analysis for Dnss Domain Name Search Software instances
• Monitor system event logs for application fault events related to the Dnss software
• Consider implementing application whitelisting and sandboxing for vulnerable software installations

How to Mitigate CVE-2020-37197

Immediate Actions Required

• Restrict access to systems running Dnss Domain Name Search Software to trusted users only
• Monitor for application crashes that may indicate exploitation attempts
• Consider discontinuing use of the vulnerable software until a patch is available
• Implement endpoint protection solutions to detect and block exploitation attempts

Patch Information

No vendor patch information is currently available for this vulnerability. Users should check the NSA Auditor Website for potential security updates. Additionally, review the VulnCheck Advisory for the latest mitigation guidance.

Workarounds

• Limit access to the Dnss Domain Name Search Software to trusted users only
• Run the application in a sandboxed or virtualized environment to contain potential crashes
• Implement input validation at the network or system level if possible to filter oversized payloads
• Consider using alternative domain name search tools until a fix is released