CVE-2017-7393 : Security Advisory and Response

TigerVNC 1.7.1 is vulnerable to a double free action in VNCSConnectionST.cxx VNCSConnectionST::fence, allowing an authorized user to potentially execute arbitrary code or cause denial of service.

Understanding CVE-2017-7393

This CVE involves a critical vulnerability in TigerVNC 1.7.1 that could have severe consequences if exploited.

What is CVE-2017-7393?

CVE-2017-7393 is a security flaw in TigerVNC 1.7.1 that enables an authenticated user to trigger a double free action in VNCSConnectionST.cxx VNCSConnectionST::fence. This action could lead to a denial of service attack or allow the execution of arbitrary code.

The Impact of CVE-2017-7393

The vulnerability in TigerVNC 1.7.1 poses a significant risk as it can be exploited by an authorized user to potentially execute malicious code or disrupt services through denial of service attacks.

Technical Details of CVE-2017-7393

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability in TigerVNC 1.7.1 allows an authenticated client to perform a double free action in VNCSConnectionST.cxx VNCSConnectionST::fence, which can result in denial of service or potential execution of arbitrary code.

Affected Systems and Versions

Affected Version: TigerVNC 1.7.1

Exploitation Mechanism

The vulnerability can be exploited by an authorized user through specific actions in VNCSConnectionST.cxx VNCSConnectionST::fence, leading to the double free scenario and subsequent security risks.

Mitigation and Prevention

Protecting systems from CVE-2017-7393 is crucial to maintaining security.

Immediate Steps to Take

Update TigerVNC to a patched version that addresses the vulnerability.
Monitor network traffic for any suspicious activity that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software and apply security patches to prevent known vulnerabilities.
Implement strong access controls and authentication mechanisms to limit the impact of potential security breaches.

Patching and Updates

Stay informed about security advisories related to TigerVNC and promptly apply patches released by the vendor to mitigate the risk of exploitation.