Buffer Overflow in SpotIM 2.2 Causes Denial of Service

Executive Summary

[{'type': 'paragraph', 'content': "CVE-2020-37211 is a denial of service vulnerability in SpotIM version 2.2 that occurs due to improper handling of input size in the registration 'Name' field."}, {'type': 'paragraph', 'content': "An attacker can exploit this by submitting a large input buffer, specifically a 1000-character payload, into the 'Name' field, which causes the application to crash."}, {'type': 'paragraph', 'content': 'This vulnerability is a classic buffer overflow (CWE-120) triggered by the oversized input.'}] [1, 2]

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Impact Analysis

[{'type': 'paragraph', 'content': 'This vulnerability can cause the SpotIM application to crash, resulting in a denial of service condition.'}, {'type': 'paragraph', 'content': "An attacker with local access and the ability to interact with the user interface can trigger this crash by inputting a large payload into the registration 'Name' field."}, {'type': 'paragraph', 'content': 'The impact is that legitimate users may be unable to use the application while it is crashed, potentially disrupting services that depend on SpotIM.'}] [1, 2]

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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 on the SpotIM 2.2 application by inputting a large payload into the registration 'Name' field."}, {'type': 'paragraph', 'content': "A practical detection method involves generating a 1000-character payload and pasting it into the 'Name' field during registration to see if the application crashes."}, {'type': 'paragraph', 'content': 'A sample Python script can be used to create the payload file as follows:'}, {'type': 'list_item', 'content': '#!/usr/bin/python'}, {'type': 'list_item', 'content': 'buffer = "A" * 1000'}, {'type': 'list_item', 'content': 'payload = buffer'}, {'type': 'list_item', 'content': 'try:'}, {'type': 'list_item', 'content': ' f = open("poc.txt", "w")'}, {'type': 'list_item', 'content': ' print("[+] Creating 1000 bytes evil payload.")'}, {'type': 'list_item', 'content': ' f.write(payload)'}, {'type': 'list_item', 'content': ' f.close()'}, {'type': 'list_item', 'content': ' print("[+] File created!")'}, {'type': 'list_item', 'content': 'except:'}, {'type': 'list_item', 'content': ' print("File cannot be created.")'}, {'type': 'paragraph', 'content': 'After generating the payload, launch SpotIM, navigate to the registration interface, select "Enter Registration Code," and paste the contents of the payload file into the \'Name\' field. Clicking "Ok" should cause the application to crash if the vulnerability is present.'}] [2]

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Mitigation Strategies

I don't know

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