Buffer Overflow in eToolz 3.4.8.0 Causes Denial of Service

Executive Summary

CVE-2018-25198 is a denial of service (DoS) vulnerability in eToolz version 3.4.8.0 and earlier. It occurs when a local attacker supplies an oversized input buffer, specifically a payload file containing 255 bytes of data, which triggers a buffer overflow condition during processing by the application.

This buffer overflow causes the application to crash, resulting in denial of service. The vulnerability is classified under CWE-787 (Out-of-bounds Write).

Useful 0 Not Useful 0

Impact Analysis

This vulnerability allows a local attacker to crash the eToolz application by supplying a specially crafted input file, causing a denial of service.

The impact is limited to availability, as the application becomes unusable until restarted or fixed, but it does not allow for privilege escalation, code execution, or data compromise.

Useful 0 Not Useful 0

Compliance Impact

I don't know

Useful 0 Not Useful 0

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by testing the eToolz application with a specially crafted payload file containing 255 bytes of data, which triggers the buffer overflow and causes the application to crash.'}, {'type': 'paragraph', 'content': "A practical approach is to create a payload file with 255 'A' characters and process it with the vulnerable eToolz version 3.4.8.0 to observe if the application crashes, indicating the presence of the vulnerability."}, {'type': 'paragraph', 'content': 'For example, using the Python script from the proof-of-concept exploit, you can generate the payload file with the following command:'}, {'type': 'list_item', 'content': 'python -c "print(\'A\'*255)" > exp.txt'}, {'type': 'paragraph', 'content': "Then, feed the 'exp.txt' file to the eToolz application and monitor if it crashes or exhibits denial of service behavior."}] [2]

Useful 0 Not Useful 0

Mitigation Strategies

To mitigate this vulnerability, immediate steps include restricting local access to the eToolz application to trusted users only, as the vulnerability requires local attacker access.

Avoid processing untrusted or suspicious input files that could contain oversized buffers designed to trigger the buffer overflow.

Additionally, monitor the application for crashes or denial of service symptoms and consider applying any available patches or updates from the vendor once released.

If no patch is available, consider running the application with least privilege and in a controlled environment to limit the impact of potential crashes.

Useful 0 Not Useful 0