CVE-2022-46337: Apache Derby Auth Bypass Vulnerability

CVE-2022-46337 Overview

CVE-2022-46337 is an LDAP Injection vulnerability in Apache Derby that allows attackers to bypass LDAP authentication checks through a cleverly devised username. This authentication bypass vulnerability can lead to multiple severe impacts including disk exhaustion attacks, malware execution, and unauthorized access to sensitive database operations.

Critical Impact

This vulnerability enables complete authentication bypass in LDAP-authenticated Derby installations, potentially allowing attackers to execute malicious code, corrupt sensitive data, and run privileged database functions.

Affected Products

• Apache Derby versions prior to 10.17.1.0
• Apache Derby 10.16.1.1 and earlier in the 10.16 release family
• LDAP-authenticated Derby installations across all affected versions

Discovery Timeline

• 2023-11-20 - CVE CVE-2022-46337 published to NVD
• 2025-06-10 - Last updated in NVD database

Technical Details for CVE-2022-46337

Vulnerability Analysis

This vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as Injection. The flaw exists in how Apache Derby handles username inputs during LDAP authentication, allowing specially crafted usernames to bypass authentication mechanisms entirely.

In LDAP-authenticated Derby environments, the vulnerability creates three distinct attack scenarios. First, an attacker can fill up disk space by creating arbitrary junk Derby databases, leading to denial of service conditions. Second, if malware is visible to and executable by the Derby server's service account, an attacker can leverage this bypass to execute that malicious code. Third, in databases protected only by LDAP authentication (without SQL GRANT/REVOKE authorization), attackers can view and corrupt sensitive data while executing privileged database functions and procedures.

Root Cause

The root cause lies in insufficient input validation and sanitization of usernames during the LDAP authentication process. Apache Derby fails to properly neutralize special elements within username inputs before passing them to the LDAP authentication subsystem. This allows attackers to craft malicious usernames that manipulate the LDAP query logic, effectively bypassing the intended authentication controls.

Attack Vector

The vulnerability is exploitable over the network without requiring any prior authentication or user interaction. An attacker targets LDAP-authenticated Derby installations by submitting a specially crafted username during the authentication process. The malicious username contains special characters or sequences that alter the LDAP authentication query behavior, causing the system to incorrectly validate the attacker's credentials.

The attack exploits the trust relationship between Derby and its configured LDAP server by manipulating the authentication flow rather than compromising the LDAP server directly. Once authentication is bypassed, the attacker gains unauthorized access to the Derby database server with the privileges of legitimate users.

Detection Methods for CVE-2022-46337

Indicators of Compromise

• Unusual or malformed usernames in Derby authentication logs containing special LDAP characters such as *, (, ), \, or null bytes
• Unexpected creation of new Derby databases, particularly with random or suspicious naming patterns
• Authentication success events for unknown or suspicious user accounts
• Abnormal disk usage patterns or sudden disk space exhaustion on Derby server hosts

Detection Strategies

• Monitor Derby authentication logs for usernames containing LDAP injection patterns or special metacharacters
• Implement alerting for database creation events that occur outside normal operational windows
• Deploy file integrity monitoring on Derby data directories to detect unauthorized database creation
• Review Derby server service account activity for unexpected process execution or file access

Monitoring Recommendations

• Enable verbose logging for Derby's LDAP authentication module to capture all authentication attempts
• Configure disk space monitoring with alerts for unusual growth patterns in Derby database directories
• Implement network monitoring for connections to Derby servers from unexpected source addresses
• Establish baseline metrics for database operations and alert on significant deviations

How to Mitigate CVE-2022-46337

Immediate Actions Required

• Upgrade to Java 21 and Apache Derby 10.17.1.0 immediately for production environments
• For environments requiring older Java versions, build custom Derby distributions from patched release families: 10.16 (Java 17), 10.15 (Java 11), or 10.14 (Java 8)
• Implement SQL GRANT/REVOKE authorization as an additional layer of defense for all Derby databases
• Restrict network access to Derby servers using firewall rules to limit exposure

Patch Information

Apache has released Derby version 10.17.1.0 which addresses this vulnerability. The fix has also been backported to the 10.16, 10.15, and 10.14 release families to support organizations running Java LTS versions 17, 11, and 8 respectively. Organizations should obtain the patched source code and build their own distributions for these older release families.

For additional details, refer to the Apache Mailing List Discussion regarding this vulnerability.

Workarounds

• Enable SQL GRANT/REVOKE authorization on all Derby databases as a defense-in-depth measure to limit damage from authentication bypass
• Restrict the Derby server service account permissions to minimize the impact of potential malware execution
• Implement network segmentation to isolate Derby servers from untrusted network segments
• Consider temporarily disabling LDAP authentication and using alternative authentication mechanisms until patches can be applied

# Configuration example - Enable SQL authorization in Derby
# Add to derby.properties file
derby.database.sqlAuthorization=true
derby.connection.requireAuthentication=true