CVE-2023-1907: pgAdmin Auth Bypass Vulnerability

CVE-2023-1907 Overview

A session hijacking vulnerability exists in pgAdmin when running in server mode with LDAP authentication enabled. Users logging into pgAdmin may be inadvertently attached to another user's session if multiple connection attempts occur simultaneously. This race condition in the authentication mechanism can lead to unauthorized access to database administration sessions, potentially exposing sensitive data and allowing unauthorized database operations.

Critical Impact

Authenticated users may gain access to other users' pgAdmin sessions, potentially allowing unauthorized access to database credentials, query history, and administrative functions belonging to other users.

Affected Products

• pgAdmin (PostgreSQL administration tool)
• pgAdmin running in server mode with LDAP authentication
• All versions prior to the security patch

Discovery Timeline

• 2025-01-09 - CVE CVE-2023-1907 published to NVD
• 2025-06-20 - Last updated in NVD database

Technical Details for CVE-2023-1907

Vulnerability Analysis

This vulnerability is classified under CWE-488 (Exposure of Data Element to Wrong Session) and CWE-276 (Incorrect Default Permissions). The core issue stems from improper session handling during LDAP authentication when pgAdmin operates in server mode. When multiple users attempt to authenticate simultaneously through the LDAP mechanism, the application fails to properly isolate session contexts, creating a race condition that can result in session attachment to the wrong user.

The vulnerability requires network access and low privileges (authenticated user access), though the attack complexity is high due to the timing-dependent nature of the exploit. Successful exploitation requires multiple simultaneous login attempts, making it a probabilistic attack that may require multiple attempts to succeed.

Root Cause

The root cause lies in the session management logic within pgAdmin's LDAP authentication handler. During the authentication flow, session data is not properly isolated between concurrent requests, leading to potential session assignment errors. This represents a classic race condition vulnerability (CWE-488) where data elements are exposed to the wrong session context due to improper synchronization of shared resources during the authentication process.

Attack Vector

The attack vector is network-based and requires the following conditions:

1. pgAdmin must be running in server mode (multi-user deployment)
2. LDAP authentication must be configured and enabled
3. Multiple users must be attempting to authenticate simultaneously
4. The attacker must have valid LDAP credentials to initiate authentication

The exploitation scenario involves an attacker timing their authentication request to coincide with other legitimate users' login attempts. Due to the race condition, the attacker's session may be incorrectly associated with another user's authentication context, granting them access to that user's pgAdmin session and all associated database connections.

Detection Methods for CVE-2023-1907

Indicators of Compromise

• Unusual session activity where users report being logged into sessions they did not initiate
• Authentication logs showing successful logins followed by immediate activity inconsistent with the authenticated user's normal behavior
• Multiple concurrent LDAP authentication attempts from the same IP address within short time windows
• Session logs indicating users accessing database objects or servers they do not typically interact with

Detection Strategies

• Monitor pgAdmin authentication logs for anomalous patterns of simultaneous login attempts
• Implement session binding verification that correlates user identity with session attributes throughout the session lifetime
• Configure LDAP server logging to capture detailed authentication timing information
• Deploy application-level monitoring to detect session context mismatches

Monitoring Recommendations

• Enable verbose logging in pgAdmin to capture detailed authentication flow information
• Configure SIEM rules to alert on multiple concurrent authentication attempts from the same source
• Implement user behavior analytics to detect sessions exhibiting activity inconsistent with the authenticated user's profile
• Regularly audit session logs for evidence of session hijacking or unauthorized access patterns

How to Mitigate CVE-2023-1907

Immediate Actions Required

• Upgrade pgAdmin to the latest patched version that addresses this vulnerability
• If immediate patching is not possible, consider temporarily disabling LDAP authentication and using local authentication
• Restrict network access to pgAdmin server mode deployments to trusted networks only
• Implement additional authentication factors to reduce the impact of session hijacking

Patch Information

Administrators should consult the Red Hat CVE-2023-1907 Advisory for detailed patch information and affected version details. Additional technical information is available in the Red Hat Bug Report #2218384. It is recommended to update to the latest version of pgAdmin that contains the fix for this vulnerability.

Workarounds

• Disable LDAP authentication and use local authentication methods until the patch can be applied
• Implement rate limiting on authentication endpoints to reduce the likelihood of simultaneous authentication attempts
• Deploy pgAdmin in desktop mode for single-user scenarios where server mode is not required
• Use a reverse proxy with session affinity to help isolate authentication requests
• Configure firewall rules to limit concurrent connections from single IP addresses to the pgAdmin authentication endpoint