How the Mentioned CVE Works:
The vulnerability (CVE-2025-XXXX) in Keycloak arises due to the absence of an LDAP bind operation following a password reset. When a user resets their password, Keycloak fails to revalidate the user’s credentials against the LDAP server. This oversight allows expired or disabled Active Directory (AD) accounts to bypass authentication checks. Attackers can exploit this flaw to gain unauthorized access to systems by resetting passwords for accounts that should no longer be valid. The issue affects Keycloak versions >= 26.1.0 and < 26.1.3, as well as versions < 26.0.10. Patched versions (26.1.3 and 26.0.10) enforce LDAP validation after password updates, ensuring alignment with AD authentication policies.
DailyCVE Form:
Platform: Keycloak
Version: >= 26.1.0, < 26.1.3; < 26.0.10
Vulnerability: Authentication Bypass
Severity: Moderate
Date: Mar 10, 2025
What Undercode Say:
Exploitation:
- Exploit Scenario: Attackers target expired or disabled AD accounts, reset their passwords, and bypass authentication due to missing LDAP bind validation.
2. Proof of Concept (PoC):
- Reset password for a disabled AD account via Keycloak.
- Attempt login without LDAP revalidation.
- Gain unauthorized access.
Protection:
- Update Keycloak: Upgrade to patched versions (26.1.3 or 26.0.10).
- Enforce LDAP Bind: Ensure LDAP validation is performed after password resets.
- Monitor Logs: Check for unusual password reset activities.
Commands:
1. Check Keycloak Version:
keycloak/bin/kc.sh --version
2. Update Keycloak:
wget https://github.com/keycloak/keycloak/releases/download/26.1.3/keycloak-26.1.3.tar.gz tar -xzf keycloak-26.1.3.tar.gz
3. Enable LDAP Debugging:
export LDAPDEBUG=1
Code Snippets:
1. LDAP Bind Validation (Java):
LdapContext ctx = new InitialLdapContext(env, null); ctx.addToEnvironment(Context.SECURITY_CREDENTIALS, newPassword); ctx.reconnect(null);
2. Password Reset Hook:
public void resetPassword(String userId, String newPassword) {
// Reset password logic
validateLdapBind(userId, newPassword);
}
Analytics:
- Impact: Moderate risk for organizations using Keycloak with LDAP/AD integration.
- Affected Systems: Keycloak instances >= 26.1.0 and < 26.1.3, or < 26.0.10.
- Mitigation Rate: High, as patches are readily available.
References:
- GitHub Advisory: bash
- Keycloak Documentation: bash
By following these steps, organizations can mitigate the risk posed by this vulnerability and ensure secure authentication mechanisms.
References:
Reported By: https://github.com/advisories/GHSA-2p82-5wwr-43cw
Extra Source Hub:
Undercode
