CVE-2020-9343 : Security Advisory and Response

An issue was discovered in signotec signoPAD-API/Web (formerly Websocket Pad Server) before 3.1.1 on Windows. This vulnerability allows for a Denial of Service attack due to the lack of limits on parsing nested JSON structures, potentially exploited via WebSocket data.

Understanding CVE-2020-9343

This CVE identifies a vulnerability in signotec signoPAD-API/Web that can lead to a Denial of Service attack on Windows systems.

What is CVE-2020-9343?

The vulnerability in signotec signoPAD-API/Web allows attackers to conduct a Denial of Service attack by exploiting the lack of restrictions on parsing deeply nested JSON structures.

The Impact of CVE-2020-9343

The vulnerability enables attackers to execute a Denial of Service attack by sending specially crafted WebSocket data containing deeply nested JSON arrays.

Technical Details of CVE-2020-9343

This section provides technical details about the vulnerability.

Vulnerability Description

The issue in signotec signoPAD-API/Web before version 3.1.1 on Windows arises from the absence of constraints on parsing nested JSON structures, facilitating a Denial of Service attack.

Affected Systems and Versions

Product: signotec signoPAD-API/Web
Vendor: signotec
Versions affected: All versions before 3.1.1

Exploitation Mechanism

Attackers can exploit this vulnerability by sending WebSocket data with deeply nested JSON arrays to a victim who visits a malicious website.

Mitigation and Prevention

Protect systems from CVE-2020-9343 with the following measures.

Immediate Steps to Take

Update signotec signoPAD-API/Web to version 3.1.1 or newer to mitigate the vulnerability.
Avoid visiting untrusted or suspicious websites to minimize the risk of exploitation.

Long-Term Security Practices

Implement network-level protections such as firewalls to filter and monitor WebSocket traffic.
Regularly educate users on safe browsing practices to prevent exposure to malicious content.

Patching and Updates

Stay informed about security updates and patches released by signotec to address vulnerabilities like CVE-2020-9343.