CVE-2017-5636 Explained : Impact and Mitigation

Apache NiFi versions before 0.7.2 and 1.x before 1.1.2 are vulnerable to an injection attack allowing impersonation and privilege escalation.

Understanding CVE-2017-5636

In a cluster setting, Apache NiFi has a vulnerability in the serialization/deserialization of proxy chain, enabling an attacker to impersonate another user.

What is CVE-2017-5636?

This CVE refers to a security flaw in Apache NiFi versions prior to 0.7.2 and 1.x before 1.1.2 that allows an injection attack through manipulated usernames.

The Impact of CVE-2017-5636

The vulnerability permits an attacker to impersonate another user and gain their permissions on a replicated request to a different node, potentially leading to unauthorized access and privilege escalation.

Technical Details of CVE-2017-5636

Apache NiFi CVE-2017-5636 involves the following technical aspects:

Vulnerability Description

The vulnerability lies in the serialization/deserialization of the proxy chain in Apache NiFi, enabling injection attacks through carefully crafted usernames.

Affected Systems and Versions

Product: Apache NiFi
Vendor: Apache Software Foundation
Affected Versions: 0.7.0, 0.7.1, 1.1.0, 1.1.1

Exploitation Mechanism

The vulnerability can be exploited through an injection attack by using a meticulously manipulated username to impersonate another user and acquire their permissions on a replicated request to a different node.

Mitigation and Prevention

To address CVE-2017-5636, consider the following steps:

Immediate Steps to Take

Upgrade Apache NiFi to version 0.7.2 or 1.1.2 or later to mitigate the vulnerability.
Monitor and restrict user permissions to minimize the risk of unauthorized access.

Long-Term Security Practices

Implement strict input validation to prevent injection attacks.
Regularly review and update security configurations to address emerging threats.

Patching and Updates

Stay informed about security advisories from Apache NiFi and promptly apply patches to secure the system.