Buffer Overflow in Dnss Domain Name Search Causes DoS

Executive Summary

[{'type': 'paragraph', 'content': "CVE-2020-37197 is a denial of service vulnerability in the Dnss Domain Name Search Software. It occurs because the software does not properly check the size of input data in the 'Name' registration field, allowing an attacker to overflow the buffer by entering a payload of 1000 characters. This overflow causes the application to crash."}] [2, 1]

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can impact you by causing the Dnss Domain Name Search Software to crash, resulting in a denial of service condition. An attacker with local access and requiring user interaction can trigger this crash by inputting a specially crafted 1000-character payload into the 'Name' field during registration. This can lead to application instability and disrupt normal operations."}] [2, 1]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by attempting to reproduce the denial of service condition locally on the system running the Dnss Domain Name Search Software.'}, {'type': 'paragraph', 'content': 'A proof-of-concept exploit involves creating a payload of 1000 characters (e.g., 1000 "A" characters) and pasting it into the \'Name\' input field during the software\'s registration process. If the application crashes or becomes unstable, the vulnerability is present.'}, {'type': 'paragraph', 'content': 'There are no specific network detection commands since the exploit is local and requires user interaction.'}, {'type': 'paragraph', 'content': 'An example command to generate the payload file (poc.txt) using Python is:'}, {'type': 'list_item', 'content': 'python -c "print(\'A\'*1000)" > poc.txt'}, {'type': 'paragraph', 'content': "Then, open the Dnss software registration interface and paste the contents of poc.txt into the 'Name' field to test for the crash."}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': "To mitigate this vulnerability immediately, avoid entering excessively long input (such as 1000 characters) into the 'Name' input field of the Dnss Domain Name Search Software."}, {'type': 'paragraph', 'content': 'Restrict user interaction with the registration interface to trusted users only, as the attack requires local user interaction.'}, {'type': 'paragraph', 'content': 'If possible, apply any available patches or updates from the software vendor that address this buffer overflow issue.'}, {'type': 'paragraph', 'content': 'Consider running the software in a controlled environment or sandbox to limit the impact of potential crashes.'}] [2]

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