CVE-2019-3923 : Security Advisory and Response

A stored cross-site scripting (XSS) vulnerability was discovered in Tenable Nessus versions 8.2.1 and earlier, allowing authenticated attackers to execute arbitrary script code in a user's browser session. Tenable has released Nessus 8.2.2 to address this issue.

Understanding CVE-2019-3923

This CVE involves a vulnerability in Tenable Nessus that could lead to stored XSS attacks.

What is CVE-2019-3923?

The vulnerability in Nessus versions 8.2.1 and earlier allowed for stored cross-site scripting (XSS) attacks due to inadequate validation of user input.

The Impact of CVE-2019-3923

If successfully exploited, an authenticated attacker could execute arbitrary script code within a user's browser session, potentially leading to unauthorized actions.

Technical Details of CVE-2019-3923

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in Tenable Nessus versions 8.2.1 and earlier was a stored cross-site scripting (XSS) issue resulting from improper validation of user-supplied input.

Affected Systems and Versions

Product: Tenable Nessus
Vendor: Tenable
Versions Affected: All versions prior to 8.2.2

Exploitation Mechanism

An authenticated attacker could exploit this vulnerability by submitting a specially crafted request to execute malicious script code in a user's browser session.

Mitigation and Prevention

To address CVE-2019-3923, follow these mitigation steps:

Immediate Steps to Take

Upgrade to Nessus version 8.2.2 or later to eliminate the vulnerability.
Regularly monitor for security advisories from Tenable.

Long-Term Security Practices

Implement secure coding practices to prevent XSS vulnerabilities.
Conduct regular security assessments and penetration testing to identify and address potential security weaknesses.

Patching and Updates

Apply patches and updates promptly to ensure that known vulnerabilities are mitigated effectively.