CVE-2019-15691 Explained : Impact and Mitigation

TigerVNC version 1.10.0 is susceptible to a stack use-after-return vulnerability due to improper stack memory usage in ZRLEDecoder, potentially leading to remote code execution.

Understanding CVE-2019-15691

This CVE involves a critical vulnerability in TigerVNC versions prior to 1.10.1, allowing attackers to exploit the stack use-after-return issue for malicious activities.

What is CVE-2019-15691?

The vulnerability arises from incorrect handling of stack memory in ZRLEDecoder, enabling attackers to execute arbitrary code remotely through network connections.

The Impact of CVE-2019-15691

Exploiting this vulnerability could result in unauthorized remote code execution, posing a significant threat to the security and integrity of affected systems.

Technical Details of CVE-2019-15691

TigerVNC's vulnerability in version 1.10.0 stems from a specific issue in the ZRLEDecoder component.

Vulnerability Description

The vulnerability is a stack use-after-return flaw caused by improper stack memory usage in ZRLEDecoder, potentially leading to remote code execution.

Affected Systems and Versions

Product: TigerVNC
Vendor: Kaspersky
Vulnerable Version: 1.10.0

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating stack memory in ZRLEDecoder, allowing them to execute malicious code remotely.

Mitigation and Prevention

To address CVE-2019-15691, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Update TigerVNC to version 1.10.1 or later to mitigate the vulnerability.
Implement network security measures to prevent unauthorized access.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Conduct security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Apply patches and updates provided by TigerVNC promptly to ensure system security.