CVE-2023-39348 : Security Advisory and Response

This article provides an overview of CVE-2023-39348, focusing on the impact, technical details, and mitigation strategies.

Understanding CVE-2023-39348

CVE-2023-39348 involves improper log output when using GitHub Status Notifications in Spinnaker, an open-source multi-cloud continuous delivery platform.

What is CVE-2023-39348?

Spinnaker sets log output to FULL when updating GitHub status, potentially exposing GitHub tokens. This could lead to unauthorized access to repositories, posing a higher risk than initially assessed.

The Impact of CVE-2023-39348

Users at risk are those utilizing GitHub Status Notifications. Exposure of GitHub tokens in logs could result in unauthorized access to repositories. It is crucial to take immediate action to prevent token exposure.

Technical Details of CVE-2023-39348

The vulnerability allows for sensitive information, such as GitHub tokens, to be inserted into log files, posing a security risk.

Vulnerability Description

Improper log settings in Spinnaker expose GitHub tokens, enabling potential unauthorized access to repositories outside users' control.

Affected Systems and Versions

Vendor: Spinnaker
Product: Spinnaker
Affected Versions:
< 1.28.8

= 1.29.0, < 1.29.6

= 1.30.0, < 1.30.3

= 1.31.0, < 1.31.1

Exploitation Mechanism

The vulnerability occurs when updating GitHub status in Spinnaker, leading to GitHub tokens being logged, potentially granting unauthorized access to repositories.

Mitigation and Prevention

To address CVE-2023-39348, immediate steps must be taken to mitigate the risk and prevent unauthorized access to GitHub repositories.

Immediate Steps to Take

Apply the patch provided by Spinnaker
Rotate the GitHub token used for GitHub status notifications

Long-Term Security Practices

Disable GitHub Status Notifications if unable to upgrade
Filter logs for Echo log data to identify potential token exposure
Use read-only tokens with limited scope to restrict unauthorized access

Patching and Updates

The issue has been resolved in the pull request 1316. Users are strongly advised to upgrade to the latest version of Spinnaker to address the vulnerability and enhance security measures.