CVE-2019-20788 : Security Advisory and Response

In LibVNCServer up to version 0.9.12, a vulnerability exists in the code in libvncclient/cursor.c, involving an integer overflow and a heap-based buffer overflow. This issue can be exploited by providing a large width or height value.

Understanding CVE-2019-20788

This CVE entry pertains to a specific vulnerability in LibVNCServer that can lead to security risks.

What is CVE-2019-20788?

CVE-2019-20788 is a vulnerability found in LibVNCServer up to version 0.9.12, related to an integer overflow and a heap-based buffer overflow in the cursor.c code.

The Impact of CVE-2019-20788

This vulnerability can be exploited by providing large width or height values, potentially leading to security breaches and unauthorized access to systems.

Technical Details of CVE-2019-20788

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability in LibVNCServer involves an integer overflow and a heap-based buffer overflow in the cursor.c code, triggered by large width or height values.

Affected Systems and Versions

Affected Version: Up to 0.9.12
Specific Products and Vendors: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by providing excessively large width or height values, which triggers the integer overflow and heap-based buffer overflow.

Mitigation and Prevention

To address and prevent the risks associated with CVE-2019-20788, consider the following steps:

Immediate Steps to Take

Update LibVNCServer to a patched version if available
Implement network segmentation to limit exposure

Long-Term Security Practices

Regularly monitor and update software components
Conduct security assessments and penetration testing

Patching and Updates

Stay informed about security advisories and patches
Apply relevant security updates promptly