CVE-2020-15103 : Security Advisory and Response

CVE-2020-15103 is an Integer Overflow vulnerability in FreeRDP that affects versions up to 2.1.2. This CVE allows a malicious server to crash the client by sending data that triggers an integer overflow. The issue has been resolved in version 2.2.0.

Understanding CVE-2020-15103

In this section, we will delve into the details of the Integer Overflow vulnerability in FreeRDP.

What is CVE-2020-15103?

CVE-2020-15103 is an Integer Overflow vulnerability in FreeRDP versions up to 2.1.2 due to missing input sanitation in the rdpegfx channel. It allows a malicious server to send data that can crash the client later on.

The Impact of CVE-2020-15103

The impact of this vulnerability is considered low, with a CVSS base score of 3.5. However, it can lead to a denial of service if exploited.

Technical Details of CVE-2020-15103

Let's explore the technical aspects of CVE-2020-15103.

Vulnerability Description

The vulnerability arises from an integer overflow issue in FreeRDP, where input rectangles from the server are not properly validated, leading to a potential crash.

Affected Systems and Versions

Vendor: FreeRDP
Product: FreeRDP
Affected Versions: <= 2.1.2

Exploitation Mechanism

The vulnerability can be exploited by a malicious server sending data that triggers an integer overflow, causing the client to crash.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2020-15103 vulnerability.

Immediate Steps to Take

Upgrade FreeRDP to version 2.2.0 or later to address the vulnerability.
Avoid using command line arguments /gfx, /gfx-h264, and /network:auto as workarounds.

Long-Term Security Practices

Regularly update software to the latest versions to patch known vulnerabilities.
Implement network security measures to detect and prevent malicious server communications.

Patching and Updates

Ensure timely patching and updates for FreeRDP to stay protected against known vulnerabilities.