Sensitive Data Exposure in Cloud-Init Logs - CVE-2023-1786
Summary
DEBIAN-CVE-2023-1786: Sensitive data could be exposed in logs of cloud-init before version 23.1.2. Affects cloud-init versions < 23.2-1. Fixed in 23.2-1. How to fix ↓
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Background
Cloud-init is a widely used package in cloud computing environments that automates the initialization of cloud instances. It allows users to configure and customize their cloud instances at boot time, providing essential functionalities such as user data processing, network configuration, and package installation. However, prior to version 23.1.2, cloud-init had a vulnerability that could expose sensitive data in its logs, potentially leading to security breaches.
Vulnerability Detail
The vulnerability identified as CVE-2023-1786 allows sensitive data, including hashed passwords, to be logged by cloud-init before version 23.1.2. This exposure can be exploited by attackers to gain unauthorized access or escalate privileges within the system. The issue arises from improper handling of sensitive information, which is logged without adequate protection, making it accessible to anyone who can view the logs.
How To Fix
Minimum fixed version
23.2-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade cloud-initTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can restrict access to cloud-init logs by modifying file permissions or redirecting logs to a secure location where unauthorized users cannot access them. For example, you can change the permissions of the log file using the command: 'chmod 600 /var/log/cloud-init.log'.
Conclusion
CVE-2023-1786 is a critical vulnerability in cloud-init that exposes sensitive data in logs, posing a risk to system security. Users are strongly advised to update to the latest version to mitigate this risk. Implementing workarounds can provide temporary relief, but updating is the best long-term solution.
See every vulnerability recorded for cloud-init →
FAQ
CVE-2023-1786 is a vulnerability in cloud-init that allows sensitive data to be exposed in logs, potentially leading to unauthorized access.
Versions of cloud-init prior to 23.1.2 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If an immediate update is not possible, consider restricting access to the logs as a temporary workaround.
More information can be found in the official Debian CVE database at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-1786.json.
References
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