CVE-2023-39418 : Security Advisory and Response
Discover the impact of the CVE-2023-39418 vulnerability in PostgreSQL's MERGE command, affecting Red Hat Enterprise Linux 8 and 9. Learn about mitigation measures and available patches.
A vulnerability in PostgreSQL has been discovered where the MERGE command fails to enforce update or select row security policies, potentially allowing unauthorized access to certain rows.
Understanding CVE-2023-39418
This section delves into the details of the CVE-2023-39418 vulnerability.
What is CVE-2023-39418?
PostgreSQL's vulnerability arises from the MERGE command's failure to test new rows against row security policies defined for UPDATE and SELECT. Attackers could exploit this flaw by storing rows that are forbidden by UPDATE and SELECT policies.
The Impact of CVE-2023-39418
This vulnerability poses a low severity risk, with a CVSS base score of 3.1 out of 10. While the attack complexity is high, the confidentiality and integrity impacts are low. The vulnerability does not impact availability, but privileges required are low, making it easier for attackers to exploit.
Technical Details of CVE-2023-39418
In this section, the technical aspects of the CVE-2023-39418 vulnerability are discussed.
Vulnerability Description
The vulnerability lies in how PostgreSQL handles the MERGE command, allowing users to bypass row security policies and access restricted rows.
Affected Systems and Versions
- Product: PostgreSQL 15.4 (Unaffected)
- Red Hat Enterprise Linux 8: postgresql:15 (Affected)
- Red Hat Enterprise Linux 8.8 Extended Update Support: postgresql:15 (Affected)
- Red Hat Enterprise Linux 9: postgresql:15 (Affected)
- Red Hat Enterprise Linux 9.2 Extended Update Support: postgresql:15 (Affected)
- Red Hat Enterprise Linux 6, 7, 8: Unaffected
- Red Hat Software Collections: Unaffected
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating the MERGE command to store unauthorized rows in PostgreSQL databases.
Mitigation and Prevention
This section provides guidance on mitigating and preventing the CVE-2023-39418 vulnerability.
Immediate Steps to Take
- Apply relevant security updates provided by Red Hat promptly.
- Monitor PostgreSQL systems for any unauthorized access or activity.
Long-Term Security Practices
- Regularly review and update row security policies in PostgreSQL databases.
- Conduct security audits to identify any potential vulnerabilities.
Patching and Updates
For detailed information on patches and updates, refer to the Red Hat Security Advisory links: