CVE-2019-5631 Explained : Impact and Mitigation

A vulnerability in the 'prunsrv.exe' component of the Rapid7 InsightAppSec broker has been identified, allowing local users to escalate privileges.

Understanding CVE-2019-5631

This CVE involves a local privilege escalation vulnerability in Rapid7 InsightAppSec, impacting versions 2019.06.24 and earlier.

What is CVE-2019-5631?

The vulnerability in 'prunsrv.exe' allows authenticated local users to elevate their privileges to the level of InsightAppSec, potentially leading to system compromise.

The Impact of CVE-2019-5631

CVSS Base Score: 7.8 (High)
Attack Vector: Local
Confidentiality, Integrity, and Availability Impact: High
Privileges Required: Low

Technical Details of CVE-2019-5631

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability allows local users to increase their privileges to the level of InsightAppSec, typically SYSTEM, in versions 2019.06.24 and earlier.

Affected Systems and Versions

Affected Product: InsightAppSec
Vendor: Rapid7
Affected Versions: <= 2019.06.24

Exploitation Mechanism

The vulnerability can be exploited by authenticated local users to gain elevated privileges within the InsightAppSec system.

Mitigation and Prevention

To address CVE-2019-5631, users and system administrators should take the following steps:

Immediate Steps to Take

Update Rapid7 InsightAppSec to version 2019.07.08 or later.
Avoid granting local logon privileges to untrusted users if immediate patching is not possible.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement the principle of least privilege to restrict user access rights.

Patching and Updates

Ensure that all systems running InsightAppSec are updated to version 2019.07.08 or above to mitigate the vulnerability.