CVE-2018-1053 : Security Advisory and Response

In postgresql versions 9.3.x prior to 9.3.21, 9.4.x prior to 9.4.16, 9.5.x prior to 9.5.11, 9.6.x prior to 9.6.7, and 10.x prior to 10.2, a vulnerability exists in pg_upgrade that could allow an authenticated attacker to access or modify sensitive files.

Understanding CVE-2018-1053

This CVE involves a security issue in PostgreSQL versions that could potentially lead to unauthorized access to critical data.

What is CVE-2018-1053?

In PostgreSQL versions 9.3.x to 10.x, a vulnerability in pg_upgrade allows an authenticated attacker to manipulate a file created during the upgrade process, potentially exposing sensitive information like database passwords.

The Impact of CVE-2018-1053

The vulnerability could result in unauthorized access or modification of critical files containing encrypted and unencrypted database passwords, posing a significant security risk.

Technical Details of CVE-2018-1053

This section delves into the specifics of the vulnerability.

Vulnerability Description

During pg_upgrade execution, a file is generated in the current working directory with sensitive information, created under a different umask than usual, potentially allowing unauthorized access.

Affected Systems and Versions

PostgreSQL 9.3.x before 9.3.21
PostgreSQL 9.4.x before 9.4.16
PostgreSQL 9.5.x before 9.5.11
PostgreSQL 9.6.x before 9.6.7
PostgreSQL 10.x before 10.2

Exploitation Mechanism

An authenticated attacker could exploit the vulnerability by accessing or modifying the file created during pg_upgrade, potentially compromising database passwords.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by PostgreSQL or system vendors promptly.
Monitor file access and modifications in the current working directory.

Long-Term Security Practices

Implement strict file permissions and umask settings to restrict unauthorized access.
Regularly review and update security configurations to prevent similar vulnerabilities.

Patching and Updates

Ensure that PostgreSQL and related systems are regularly updated with the latest security patches to mitigate the risk of exploitation.