Executive Summary

This vulnerability exists in the DeskTime Time Tracking App versions prior to 1.3.674 due to improper TLS certificate validation during the application's update process.

Attackers who can position themselves between the client and the DeskTime update servers (performing a man-in-the-middle attack) can exploit this flaw by delivering malicious executables in response to update requests.

The app fails to correctly validate the server's TLS certificate, accepting certificates with chain errors, which allows attackers to use self-signed certificates to intercept and manipulate update requests.

As a result, the attacker can cause the DeskTime app to automatically download and execute malicious code with user-level privileges without any user interaction.

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Impact Analysis

This vulnerability can lead to user-level remote code execution on the affected client.

An attacker who successfully exploits this flaw can run arbitrary malicious code on your system by delivering a malicious update through a man-in-the-middle attack.

Since the update process is automatic and requires no user interaction, exploitation can happen silently and repeatedly, potentially compromising your system's security and data.

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Detection Guidance

This vulnerability can be detected by monitoring the DeskTime application's update process for improper TLS certificate validation and unusual network activity indicative of a man-in-the-middle (MitM) attack.

A proof of concept involves redirecting the DeskTime update domain to a local proxy and intercepting update requests to observe if the application accepts self-signed or invalid TLS certificates.

Suggested commands and steps include:

• Modify the local hosts file to redirect desktime.com to a controlled IP (e.g., localhost).
• Use a proxy tool like Burp Suite with TLS interception enabled to capture and analyze update requests from the DeskTime app.
• Monitor network traffic for HTTPS requests to the DeskTime update servers and check if the TLS certificates are properly validated or if invalid/self-signed certificates are accepted.
• Check the DeskTime application version; versions prior to 1.3.674 are vulnerable.

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Mitigation Strategies

The immediate and recommended mitigation step is to update the DeskTime Time Tracking App to version 1.3.674 or later, which contains the patch addressing the improper TLS certificate validation.

No workarounds exist for this vulnerability, so applying the official update is critical to prevent exploitation.

Additionally, consider performing a comprehensive security review of the product and monitoring network traffic for suspicious activity related to update requests.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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