CVE-2020-13940 : What You Need to Know

Apache NiFi 1.0.0 to 1.11.4 allows trusted administrators to inadvertently configure a potentially malicious XML file, leading to information disclosure via XXE.

Understanding CVE-2020-13940

In Apache NiFi 1.0.0 to 1.11.4, a vulnerability exists that enables the configuration of a malicious XML file, potentially resulting in information disclosure through XXE.

What is CVE-2020-13940?

This CVE refers to a security flaw in Apache NiFi versions 1.0.0 to 1.11.4 that allows trusted administrators to unknowingly set up a harmful XML file, which can trigger external calls to services via XXE (XML External Entity).

The Impact of CVE-2020-13940

The vulnerability in Apache NiFi can be exploited by trusted administrators to configure a malicious XML file, leading to potential information disclosure through XXE attacks.

Technical Details of CVE-2020-13940

Apache NiFi 1.0.0 to 1.11.4 is affected by the following:

Vulnerability Description

The notification service manager and various policy authorizer and user group provider objects in Apache NiFi allow trusted administrators to configure a potentially malicious XML file.

Affected Systems and Versions

Product: Apache NiFi
Versions: Apache NiFi 1.0.0 to 1.11.4

Exploitation Mechanism

Trusted administrators can inadvertently configure a malicious XML file, enabling external calls to services via XXE.

Mitigation and Prevention

To address CVE-2020-13940, consider the following steps:

Immediate Steps to Take

Update Apache NiFi to a non-vulnerable version.
Implement strict input validation to prevent the insertion of malicious XML files.

Long-Term Security Practices

Regularly review and monitor configurations for any unauthorized changes.
Educate administrators on secure configuration practices to prevent similar vulnerabilities.

Patching and Updates

Apply patches provided by Apache NiFi promptly to mitigate the vulnerability and enhance system security.