CVE-2024-11584
📋 TL;DR
CVE-2024-11584 is a privilege escalation vulnerability in cloud-init where the default world-writable permissions on a systemd socket allow unprivileged users to trigger hotplug-hook commands. This affects systems running cloud-init versions up to 25.1.2, potentially enabling unauthorized command execution. Users of cloud-based or virtualized environments with cloud-init installed are at risk.
💻 Affected Systems
- cloud-init
📦 What is this software?
Cloud Init by Canonical
⚠️ Risk & Real-World Impact
Worst Case
An unprivileged attacker could execute arbitrary commands with elevated privileges, leading to full system compromise, data theft, or lateral movement within the environment.
Likely Case
Local users may abuse the vulnerability to run unauthorized commands, disrupt system operations, or escalate privileges to gain control over the instance.
If Mitigated
With proper access controls and network segmentation, impact is limited to local privilege escalation within isolated systems, reducing broader network risk.
🎯 Exploit Status
Exploitation requires local user access; no public proof-of-concept is known, but the vulnerability is straightforward to abuse given the permissive socket permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 25.1.3
Vendor Advisory: https://github.com/canonical/cloud-init/releases/tag/25.1.3
Restart Required: Yes
Instructions:
1. Update cloud-init to version 25.1.3 or later using your package manager. 2. For Ubuntu/Debian: 'sudo apt update && sudo apt install cloud-init'. 3. For CentOS/RHEL: 'sudo yum update cloud-init'. 4. Restart the system or reload systemd: 'sudo systemctl daemon-reload'.
🔧 Temporary Workarounds
Restrict Socket Permissions
linuxManually change the socket permissions to remove world-writable access, reducing the attack surface.
sudo chmod 0660 /run/cloud-init/hook-hotplug-cmd
sudo systemctl daemon-reload
🧯 If You Can't Patch
- Implement strict access controls to limit local user accounts and monitor for unauthorized command execution.
- Use security groups or firewalls to isolate affected systems and prevent lateral movement in case of exploitation.
🔍 How to Verify
Check if Vulnerable:
Check the socket permissions: 'ls -l /run/cloud-init/hook-hotplug-cmd'. If it shows permissions like 'prw-rw-rw-', the system is vulnerable.Check Version:
cloud-init --versionVerify Fix Applied:
After patching, verify the socket permissions are restricted (e.g., 'prw-rw----') and cloud-init version is 25.1.3 or higher.📡 Detection & Monitoring
Log Indicators:
- Unusual commands executed via hotplug hooks in /var/log/cloud-init.log or systemd logs.
Network Indicators:
- None, as this is a local privilege escalation vulnerability.
SIEM Query:
Search for events related to 'cloud-init-hotplugd.socket' or unexpected process executions from non-privileged users in system logs.