Attack Chain

1. Attacker opens the Sticky Notes & Color Widgets application.
2. Attacker creates a new note within the application.
3. Attacker pastes a large payload of repeated characters (an excessively long string) into the note’s text field.
4. The application attempts to allocate memory to store the overly large note content.
5. Due to the excessive size of the string, the memory allocation fails or consumes excessive resources.
6. The application becomes unresponsive as it struggles to process the oversized data.
7. The application crashes due to resource exhaustion or a memory allocation error.
8. The Sticky Notes & Color Widgets application is no longer available to the user until restarted.

Impact

Successful exploitation of this vulnerability results in a denial-of-service condition. The Sticky Notes & Color Widgets application becomes unusable, disrupting the user’s workflow. While the vulnerability does not lead to data loss or compromise of the system, it can cause inconvenience and temporary loss of productivity. The CVSS v3.1 base score for this vulnerability is 7.5, indicating a high impact on availability.

Recommendation

• Monitor application logs for unusual memory allocation patterns, which could indicate exploitation attempts.
• Implement input validation to limit the size of notes created within the application to mitigate CVE-2021-47972.
• Deploy the Sigma rule to identify potential attempts to exploit the denial-of-service vulnerability.
• Consider contacting the vendor for a patch or update addressing CVE-2021-47972.