The CVE-2025-27017 vulnerability is a medium-severity security issue that affects Apache NiFi, a widely used data integration and processing platform. This vulnerability stems from improper handling of sensitive information, leading to potential exposure of critical credentials in event records.
Technical Details
CVE-2025-27017 is categorized as an Insertion of Sensitive Information into Externally-Accessible File or Directory (CWE-538). The vulnerability resides in the way Apache NiFi manages provenance event records when MongoDB components are involved in data processing workflows.
Key Issue:
- When MongoDB processors are configured in NiFi workflows, the username and password used for authenticating with the database are mistakenly included in provenance event records. These event records are generated during the data flow execution for tracking the origin, movement, and processing of data within the system.
- The credentials, which should remain confidential, are thus exposed to users who have permission to access provenance events.
Impact:
Confidentiality Breach:
- The exposure of MongoDB credentials could allow unauthorized individuals to access sensitive databases.
- Attackers can exploit these credentials to steal, alter, or delete data stored in MongoDB instances.
Integrity Risks:
- If the database is accessed using the exposed credentials, attackers could manipulate data, causing operational issues or introducing errors into critical workflows.
Operational Disruption:
- Access to the database by unauthorized entities could lead to unauthorized queries or even database downtime, impacting organizational processes.
Vulnerability Scope
Affected Versions:
- The vulnerability affects Apache NiFi versions 1.13.0 through 2.2.0.
Unaffected Versions:
- The issue has been resolved in Apache NiFi 2.3.0, where the design flaw has been corrected by ensuring that sensitive information like credentials is no longer included in provenance events.
Severity and Exploitation
Severity:
- CVSS Score: 6.9 (Medium Severity).
- Attack Vector: Network (requires access to provenance event records).
- Required Privileges: High (restricted to users with specific permissions in the NiFi system).
Exploitation Risks:
- The vulnerability is more relevant in internal environments where multiple users, including potentially untrusted ones, have access to NiFi provenance records.
- Although this is not a direct remote code execution or privilege escalation issue, the sensitive information exposure can have severe consequences if exploited in environments with weak access control.
Mitigation and Resolution
Apache has acknowledged and addressed this vulnerability in Apache NiFi 2.3.0. Organizations currently using affected versions must take the following steps to mitigate the issue effectively:
1. Immediate Upgrade
- Upgrade to Apache NiFi 2.3.0 or later versions as soon as possible.
- The updated version ensures that sensitive credentials like database usernames and passwords are excluded from provenance event records.
2. Credential Rotation
- For systems that may have been exposed:
- Rotate all MongoDB credentials immediately to eliminate the risks posed by any previously exposed credentials.
- Use strong, unique passwords and, if possible, implement role-based access control (RBAC) within MongoDB to minimize the impact of exposed credentials.
3. Access Restrictions
- Restrict access to provenance event records to trusted and authorized personnel only:
- Apply the principle of least privilege to limit access.
- Enforce strict user authentication and role-based permissions for accessing Apache NiFi logs and provenance events.
4. Monitor Logs
- Review provenance event records for unauthorized access or suspicious behavior. This includes auditing access logs for signs that the exposed credentials may have been used maliciously.
5. Secure Authentication
- Implement secure authentication mechanisms for MongoDB databases, such as:
- TLS/SSL encryption for connections.
- Multi-Factor Authentication (MFA) for accessing sensitive systems.
- Separation of duties for database and NiFi administration.
Broader Implications
The CVE-2025-27017 vulnerability demonstrates how improperly handled sensitive information, even in trusted systems, can lead to significant security risks. Data integration tools like Apache NiFi play a critical role in many organizational workflows, making them high-value targets for attackers. This issue highlights the importance of:
- Maintaining strict security practices when configuring workflows, especially those involving external systems like databases.
- Regularly auditing software and logging practices to ensure no sensitive information is inadvertently exposed.
- Proactively updating software to mitigate vulnerabilities as soon as patches are available.
Final Thoughts
CVE-2025-27017 is a medium-severity vulnerability with potentially far-reaching consequences for organizations that rely on Apache NiFi for data integration and processing. While its exploitation requires access to provenance records, the exposure of database credentials presents a serious risk to data confidentiality, integrity, and availability. Organizations must act swiftly to address this issue by upgrading to Apache NiFi 2.3.0, rotating MongoDB credentials, and implementing strict access controls.
