CVE-2025-23208 is a high-severity vulnerability affecting the Zot image registry, which is a vendor-neutral OCI image registry. This vulnerability allows group data stored for users in the boltdb database (meta.db) to be improperly managed. When users log in, their group memberships are appended instead of replaced, which means that any revocation or removal of groups is ignored by the API. This creates significant risks for any Zot configuration that relies on group-based authorization, as it will not respect group removals or revocations initiated by an Identity Provider (IdP).
The vulnerability is assigned a CVSS score of 7.3, indicating a high severity level. The attack vector is classified as network-based, with low complexity and no privileges or user interaction required. This means attackers can exploit this vulnerability easily, which raises the urgency for organizations to act. The vulnerability was published on January 17, 2025, and has been addressed in version 2.1.2 of the Zot image registry. Organizations are advised to prioritize patching immediately.
As of now, there are no known workarounds for this vulnerability. Organizations that continue to use affected versions risk unauthorized access to sensitive data and potential compliance issues with group-based authorization policies. Therefore, swift action to upgrade to the patched version is essential.
Risk to organizations includes unauthorized access due to ineffective group management, which can lead to data breaches and compliance violations. Given the ease of exploitation, this vulnerability should be treated with the highest priority.
Vulnerability Details
The official description of the vulnerability states that the group data stored in the boltdb database is an append-list, which results in group revocations or removals being ignored in the API. This issue has been identified as a configuration problem, potentially linked to group definitions in the config file. The vulnerability is classified as CWE-269, indicating improper privilege management.
According to the CVSS v3.1 metrics, the base score is 7.3, with a base severity of high. The attack vector is network-based, with low complexity, meaning that no special skills are required to exploit it. The privileges required are none, and there is no user interaction needed to trigger the vulnerability, increasing its risk profile.
Technical Analysis
The root cause of the vulnerability lies in the append-list structure of the group data within the boltdb database. When the SetUserGroups function is called during login, it appends new group memberships rather than replacing existing ones. This behavior fails to respect any revocations made by an IdP, thereby allowing unauthorized group memberships to persist.
The attack vector is network-based, allowing remote attackers to exploit the vulnerability without physical access. The attack complexity is low, as it does not require any specific conditions to be met. Since no privileges are required to exploit the vulnerability, it is accessible to any user or attacker able to connect to the network. Additionally, there is no need for user interaction, making it a straightforward target for exploitation.
The impact on confidentiality, integrity, and availability is classified as low. However, the potential for unauthorized access through mismanaged group memberships can lead to significant security incidents, especially in environments where group-based authorization is critical.
Risk & Impact Analysis
Organizations that utilize the Zot image registry should be aware of the real-world deployment risk posed by CVE-2025-23208. The lack of proper group management can have serious implications, particularly in environments that enforce strict access controls based on group memberships.
The blast radius of this vulnerability is substantial, as it affects all users of the Zot image registry who rely on group-based authorization. If exploited, attackers could gain unauthorized access to sensitive resources, leading to data breaches and potential compliance violations.
Given the CVSS score of 7.3 and the fact that it is not included in the KEV catalog, organizations should still treat this vulnerability with urgency. The ease of exploitation and low complexity necessitate immediate action to mitigate risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Zot prior to version 2.1.2. Organizations using these versions should take immediate action to upgrade to the latest version to mitigate the risk.
Mitigation & Remediation
To mitigate this vulnerability, organizations should upgrade to Zot version 2.1.2 or later. If upgrading is not immediately feasible, organizations should review their configuration and consider implementing additional access controls to limit exposure. Regular monitoring of group memberships and configurations can also help identify unauthorized changes.
For ongoing protection, organizations may consider implementing continuous penetration testing to identify and address similar vulnerabilities in the future.
Detection Guidance
Organizations should focus on monitoring logs for unusual access patterns related to group memberships. Behavioral anomalies, such as unexpected changes in user roles or access levels, should be investigated promptly. Network signatures that indicate unauthorized access attempts should also be flagged for review.
AppSecure Threat Intelligence Insight
CVE-2025-23208 highlights the importance of robust group management in access control systems. This vulnerability is part of a broader trend where misconfigurations in access control policies can lead to significant security risks. Security teams should take this incident as a lesson to regularly audit their access management practices.
In light of recent vulnerabilities, organizations are encouraged to enhance their security posture by adopting best practices in configuration management and user access controls. For further insights on enhancing security measures, consider reviewing the vulnerability management program and the penetration testing methodology to assess and improve your organization's security frameworks.
Organizations should remain vigilant and proactive in addressing potential vulnerabilities to safeguard their systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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