The vulnerability identified as CVE-2024-11584 affects Canonical's cloud-init through version 25.1.2. It involves a systemd socket unit, cloud-init-hotplugd.socket, that has a default SocketMode granting 0666 permissions. This misconfiguration makes the socket world-writable, which is used for the "/run/cloud-init/hook-hotplug-cmd" FIFO. Consequently, an unprivileged user could exploit this vulnerability to trigger hotplug-hook commands.
The CVSS score assigned to this vulnerability is 5.9, categorizing it as medium severity. This score reflects the potential risk to the integrity and availability of systems utilizing cloud-init. Given the nature of the vulnerability and the ease of exploitation, organizations utilizing affected versions of cloud-init are urged to take immediate action.
Organizations should prioritize patching immediately, as the implications of this vulnerability could lead to unauthorized command execution, raising significant security concerns.
As of now, there are no known exploits for this vulnerability reported in public databases, but the low complexity of the attack vector indicates a potential for rapid exploitation if not addressed.
Vulnerability Details
The vulnerability allows low-privilege users to execute commands through the hotplug-hook mechanism. The socket permissions configured to 0666 provide any user the ability to write to the socket, which can be leveraged in local environments.
The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L, indicating that it requires no privileges or user interaction, and is exploitable from a local attack vector.
This vulnerability is classified under CWE-732, which signifies improper permission assignment for critical resources.
Technical Analysis
The root cause of this vulnerability lies in the default permission settings of the systemd socket unit in cloud-init. Specifically, the socket is set to allow all users to write to it, which should typically be restricted to prevent unauthorized access.
The attack vector is local, meaning that an attacker must have access to the system where the vulnerability exists. The attack complexity is low, as it does not require significant technical skills or resources to exploit.
No privileges are required to exploit this vulnerability, and user interaction is not necessary. Confidentiality, integrity, and availability impacts are all rated as low, as the potential consequences, while significant, do not compromise the system entirely.
Risk & Impact Analysis
The real-world risk associated with CVE-2024-11584 is substantial, particularly in environments where cloud-init is widely used. The vulnerability's exploitation could lead to unauthorized command execution, resulting in potential system compromises.
Organizations should assess their deployment of cloud-init and the implications of this vulnerability. The blast radius potential is significant in multi-user environments, where unprivileged users could exploit this vulnerability to execute harmful commands.
Given the vulnerability's medium CVSS score, organizations should address this in their priority patch cycle. The absence of known exploits does not mitigate the urgency of remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of cloud-init prior to 25.1.3 are affected by this vulnerability. Organizations should ensure they upgrade to the latest version to mitigate risks associated with this issue.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to cloud-init version 25.1.3 or later. If immediate patching is not feasible, consider implementing configuration hardening to restrict socket permissions and limit user access.
Monitoring for anomalous behavior associated with the hotplug-hook commands may also provide an additional layer of security while the patching process is underway.
For further information about penetration testing services that can help validate your security posture, organizations can consult our penetration testing offerings.
Detection Guidance
Organizations should monitor logs related to the cloud-init service for any suspicious activity that may indicate attempts to exploit this vulnerability. Behavioral anomalies related to user access to the socket should also be noted.
Network signatures that capture requests made to the hotplug-hook command FIFO can assist in detecting potential exploitation attempts.
AppSecure Threat Intelligence Insight
Long-term significance of CVE-2024-11584 highlights the persistent risks associated with improper permissions in system configurations. Security teams should learn from this incident to implement stricter permission controls in their environments.
As vulnerabilities like this emerge, it becomes vital to prioritize security assessments regularly to identify and remediate misconfigurations before attackers can exploit them.
For further reading on best practices in vulnerability management, organizations can refer to our comprehensive guide on vulnerability management programs and the importance of continuous security assessments.
Additionally, organizations can explore our insights on implementing effective security measures through our penetration testing methodology to further strengthen their defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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