CVE-2020-25638: Hibernate ORM SQL Injection Vulnerability

CVE-2020-25638 Overview

A SQL injection vulnerability was discovered in Hibernate ORM versions prior to and including 5.4.23.Final. The flaw exists in the implementation of the JPA Criteria API, which permits unsanitized literals when a literal is used in the SQL comments of the query. This vulnerability could allow an attacker to access unauthorized information or potentially conduct further attacks against the underlying database.

Critical Impact

This SQL injection vulnerability in hibernate-core threatens data confidentiality and integrity by allowing attackers to access unauthorized information or conduct database manipulation attacks through unsanitized literals in JPA Criteria API query comments.

Affected Products

• Hibernate ORM (versions prior to and including 5.4.23.Final)
• Debian Linux 9.0 and 10.0
• Quarkus (affected versions)
• Oracle Communications Cloud Native Core Console 1.9.0
• Oracle Retail Customer Management and Segmentation Foundation 19.0

Discovery Timeline

• 2020-12-02 - CVE-2020-25638 published to NVD
• 2025-04-23 - Last updated in NVD database

Technical Details for CVE-2020-25638

Vulnerability Analysis

This vulnerability (CWE-89: SQL Injection) affects the Hibernate ORM framework's implementation of the JPA Criteria API. When applications use literal values in JPA Criteria queries, these literals can be embedded into SQL comments without proper sanitization. The flaw allows attackers to break out of comment boundaries and inject arbitrary SQL statements.

The attack requires network access and involves a level of complexity due to the specific conditions needed for exploitation. However, when successfully exploited, the vulnerability poses significant risks to both data confidentiality and integrity, allowing unauthorized data access and potential database manipulation.

Root Cause

The root cause lies in insufficient input validation within the Hibernate ORM JPA Criteria API implementation. When processing literal values, the framework fails to properly sanitize user-controlled input before embedding it into SQL comment sections of generated queries. This allows specially crafted input containing comment-terminating sequences to escape the comment context and inject malicious SQL code.

Attack Vector

The attack vector is network-based, requiring an attacker to supply malicious input that gets processed through the JPA Criteria API. The attacker must craft input containing SQL comment escape sequences that, when processed by the vulnerable Hibernate version, break out of the comment boundary and execute arbitrary SQL statements.

An attacker would typically inject malicious strings through application input fields that are processed by JPA Criteria queries. The payload would include comment-terminating characters (such as */) followed by arbitrary SQL commands, effectively bypassing the intended query structure and gaining unauthorized database access.

Detection Methods for CVE-2020-25638

Indicators of Compromise

• Unusual database query patterns containing SQL comment sequences (/*, */) in application logs
• Database access logs showing queries with unexpected data extraction or modification operations
• Application error logs indicating SQL syntax errors from malformed injection attempts
• Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

• Implement database activity monitoring to detect anomalous SQL query patterns and comment-based injection attempts
• Review application logs for suspicious input containing SQL comment escape sequences
• Deploy web application firewalls (WAF) with rules to detect SQL injection patterns in JPA/Hibernate contexts
• Use SentinelOne Singularity platform to monitor for behavioral indicators of SQL injection exploitation

Monitoring Recommendations

• Enable detailed logging for Hibernate ORM query generation to identify suspicious literal handling
• Monitor database audit logs for unauthorized data access or modification attempts
• Implement alerting for applications using vulnerable Hibernate ORM versions in production environments
• Correlate web application and database logs to identify injection attack chains

How to Mitigate CVE-2020-25638

Immediate Actions Required

• Upgrade Hibernate ORM to version 5.4.24.Final or later immediately
• Review and audit all JPA Criteria API usage in applications for potential exposure
• Implement input validation and parameterized queries as defense-in-depth measures
• Apply vendor-specific patches from Oracle, Debian, and other affected product vendors

Patch Information

Hibernate has released version 5.4.24.Final which addresses this SQL injection vulnerability. Organizations using affected Oracle products should apply the patches from the Oracle July 2021 CPU Alert, Oracle April 2022 CPU Alert, and Oracle July 2022 CPU Alert. Debian users should refer to Debian Security Advisory DSA-4908 and the Debian LTS Announcement for package updates.

Workarounds

• Implement strict input validation to sanitize all user-supplied data before use in JPA Criteria queries
• Use parameterized queries exclusively and avoid string concatenation in query construction
• Deploy web application firewalls to filter SQL injection patterns at the network perimeter
• Consider implementing database-level stored procedures to limit direct query manipulation

# Configuration example
# Maven dependency update for Hibernate ORM
# Update pom.xml to use patched version:
# <dependency>
#     <groupId>org.hibernate</groupId>
#     <artifactId>hibernate-core</artifactId>
#     <version>5.4.24.Final</version>
# </dependency>

# Verify Hibernate version in application
mvn dependency:tree | grep hibernate-core

# For Gradle projects, update build.gradle:
# implementation 'org.hibernate:hibernate-core:5.4.24.Final'