CVE-2023-2455 is a medium-severity vulnerability affecting PostgreSQL that allows row security policies to disregard user ID changes after inlining. This flaw can lead to incorrect policies being applied under specific conditions, notably when role-specific policies are used. Affected scenarios include when a query is planned under one role and executed under another, particularly in security definer functions or across multiple SET ROLEs. This misconfiguration may inadvertently allow users to perform forbidden reads and modifications, impacting the security of databases utilizing CREATE POLICY for row security.
The vulnerability has a CVSS score of 5.4, indicating a medium severity level that suggests organizations should address it in their priority patch cycle. The risk to organizations includes unauthorized access to sensitive data, which can lead to data breaches and compliance issues. Given its exploitability, organizations are urged to apply patches as they become available and to evaluate their security policies related to user roles and access management.
Currently, no public exploit for this vulnerability has been confirmed. However, due to its nature, organizations should remain vigilant and monitor for any potential exploitation attempts. The urgency for remediation is classified as medium, reflecting the need for timely action to mitigate risks associated with this vulnerability.
Organizations that utilize PostgreSQL, especially in environments where role-specific policies are heavily relied upon, should prioritize the assessment of their systems for this vulnerability and implement necessary updates.
Vulnerability Details
The official description of CVE-2023-2455 states that row security policies in PostgreSQL disregard user ID changes after inlining. This flaw could allow incorrect policies to be applied in scenarios involving role-specific policies. Affected databases are those that have employed CREATE POLICY to define their row security policies.
The vulnerability is classified under CWE-20, indicating improper input validation. The CVSS score of 5.4 categorizes it as medium severity, with low attack complexity, requiring low privileges, and no user interaction. The attack vector is network-based, affecting PostgreSQL versions prior to the vendor patch, specifically those from versions 11.0 to 11.20, 12.0 to 12.15, 13.0 to 13.11, 14.0 to 14.8, and 15.0 to 15.3.
Technical Analysis
The root cause of this vulnerability lies in the handling of user ID changes within row security policies. When a query is planned under one role and executed under another, the system fails to properly validate the user's identity against the appropriate security policies. This flaw allows attackers to exploit the discrepancy between the planned role and the executing role, potentially leading to unauthorized data access.
The attack vector is network-based, allowing remote attackers to exploit this vulnerability without needing physical access to the database server. The attack complexity is low, indicating that the required conditions for exploitation can be easily met by an attacker with low privileges. User interaction is not required for exploitation, further increasing the risk. The confidentiality and integrity impacts are both classified as low, while availability remains unaffected.
Risk & Impact Analysis
The real-world risk associated with CVE-2023-2455 includes the potential for unauthorized access to sensitive data. Organizations utilizing PostgreSQL in environments where user role management is critical face a heightened risk of data breaches or compliance violations if this vulnerability is exploited. The blast radius can be significant, particularly for organizations that handle sensitive or regulated data.
Given the medium CVSS score and the fact that it is not actively exploited as per current intelligence, organizations should nonetheless address this vulnerability in their priority patch cycle. Regular updates to database systems and review of security policies can help mitigate the risks associated with this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of PostgreSQL include all versions from 11.0 to 11.20, 12.0 to 12.15, 13.0 to 13.11, 14.0 to 14.8, and 15.0 to 15.3. This also impacts Red Hat's Enterprise Linux versions 8.0 and 9.0, Fedora version 38, and any software collections that utilize these versions of PostgreSQL. Organizations should ensure they are running patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations are advised to upgrade to the latest versions of PostgreSQL that address this vulnerability. Specific versions to upgrade to include PostgreSQL 11.20, 12.15, 13.11, 14.8, and 15.3 or later. If immediate patching is not feasible, organizations should review and harden their row security policies to ensure they are not subject to this vulnerability.
Additionally, implementing network controls to limit access to the database and monitoring for any anomalous access patterns can further mitigate risks. Continuous security testing, including regular penetration testing, will help identify any weaknesses in the database configurations.
Continuous penetration testing can also identify misconfigurations and vulnerabilities in real-time, aiding in timely remediation.
Detection Guidance
Organizations should monitor logs for unusual access patterns, especially where user role changes are involved. Behavioral anomalies in database queries, such as unexpected role switches or unauthorized data access attempts, should be flagged for further investigation. Network signatures that indicate abnormal access attempts to the database can also serve as detection indicators.
AppSecure Threat Intelligence Insight
CVE-2023-2455 highlights the importance of robust role and policy management in databases. As organizations increasingly rely on complex role-based access control systems, vulnerabilities like this may emerge. Regular reviews of security policies and configurations are essential to maintaining a secure database environment.
Security teams should be aware of patterns that may lead to vulnerabilities, such as improper validation of user roles in security policies. This incident serves as a reminder to strengthen input validation processes and ensure that role changes are consistently monitored.
Adopting a proactive penetration testing methodology can help organizations identify and remediate similar vulnerabilities before they are exploited.
Developing a comprehensive vulnerability management program is also crucial for maintaining an effective security posture in the face of evolving threats.
Implementing API security best practices will further enhance the security framework surrounding database interactions, minimizing potential attack vectors.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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