CVE-2021-38140 : What You Need to Know

This CVE record pertains to a vulnerability in the set_user extension module for PostgreSQL, potentially leading to privilege escalation.

Understanding CVE-2021-38140

The vulnerability details and its impact are outlined below.

What is CVE-2021-38140?

The set_user extension module in PostgreSQL before version 2.0.1 is vulnerable to privilege escalation through the misuse of RESET SESSION AUTHORIZATION after using set_user().

The Impact of CVE-2021-38140

The vulnerability could allow an attacker to escalate their privileges within the PostgreSQL environment.

Technical Details of CVE-2021-38140

This section covers the technical aspects of the vulnerability.

Vulnerability Description

The set_user extension module before version 2.0.1 for PostgreSQL is susceptible to privilege escalation by exploiting the RESET SESSION AUTHORIZATION feature after employing set_user().

Affected Systems and Versions

Affected Product: Not applicable
Affected Vendor: Not applicable
Affected Version: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by executing RESET SESSION AUTHORIZATION after using set_user(), allowing unauthorized privilege escalation.

Mitigation and Prevention

Below are the steps to mitigate and prevent exploitation of CVE-2021-38140.

Immediate Steps to Take

Upgrade to version 2.0.1 or later of the set_user extension module.
Monitor for unauthorized privilege changes in PostgreSQL.

Long-Term Security Practices

Implement least privilege access controls in PostgreSQL.
Regularly audit and review user privileges within PostgreSQL.

Patching and Updates

Apply patches provided by the PostgreSQL community promptly to address this vulnerability.