CVE-2019-3789 : Exploit Details and Defense Strategies

Cloud Foundry Routing Release, versions earlier than 0.188.0, has a security flaw allowing a user to redirect traffic meant for external route services. This vulnerability enables a user with space developer privileges to create a shadow route mimicking an external domain, redirecting traffic to an internal application.

Understanding CVE-2019-3789

The Cloud Foundry Routing Release vulnerability allows space developers to hijack route services hosted outside the platform.

What is CVE-2019-3789?

The vulnerability in Cloud Foundry Routing Release versions prior to 0.188.0 permits the redirection of traffic intended for external route services to internal applications by exploiting a shadow route.

The Impact of CVE-2019-3789

CVSS Score: 8.8 (High)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
Privileges Required: Low
Scope: Unchanged
User Interaction: None
This vulnerability poses a high risk as it allows unauthorized redirection of critical traffic.

Technical Details of CVE-2019-3789

The technical aspects of the CVE-2019-3789 vulnerability.

Vulnerability Description

The flaw in Cloud Foundry Routing Release versions prior to 0.188.0 enables the creation of shadow routes to redirect traffic intended for external route services to internal applications.

Affected Systems and Versions

Affected Product: CF Routing
Vendor: Cloud Foundry
Affected Versions: All versions prior to 0.188.0

Exploitation Mechanism

A user with space developer privileges can establish a private domain mirroring an external domain.
The user can assign this shadow route to an application, redirecting incoming traffic to the internal application.

Mitigation and Prevention

Steps to mitigate and prevent the exploitation of CVE-2019-3789.

Immediate Steps to Take

Update Cloud Foundry Routing Release to version 0.188.0 or later.
Monitor network traffic for any suspicious redirection.

Long-Term Security Practices

Regularly review and update access privileges for developers.
Implement network segmentation to restrict unauthorized access.

Patching and Updates

Apply patches and updates provided by Cloud Foundry to address the vulnerability.