CVE-2019-19791 Explained : Impact and Mitigation

CVE-2019-19791 is a vulnerability in LemonLDAP::NG that allows attackers to bypass access restrictions on SOAP/REST endpoints.

Understanding CVE-2019-19791

What is CVE-2019-19791?

Prior to version 2.0.7 of LemonLDAP::NG, there is a default configuration issue in the Apache HTTP Server. This misconfiguration leads to insufficient access restrictions on SOAP/REST endpoints when specific LemonLDAP::NG setup options are used. This vulnerability enables attackers to potentially bypass a Require directive by inserting index.fcgi/index.fcgi into a URL.

The Impact of CVE-2019-19791

This vulnerability could allow unauthorized access to sensitive SOAP/REST endpoints, leading to potential data breaches or unauthorized actions within the affected system.

Technical Details of CVE-2019-19791

Vulnerability Description

The issue arises from inadequate access controls in the Apache HTTP Server when LemonLDAP::NG is configured with certain options, allowing attackers to circumvent access restrictions.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Affected Version: Prior to 2.0.7

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating URLs to include index.fcgi/index.fcgi, thereby bypassing access restrictions set by LemonLDAP::NG.

Mitigation and Prevention

Immediate Steps to Take

Upgrade to version 2.0.7 of LemonLDAP::NG to mitigate the vulnerability.
Review and adjust the Apache HTTP Server configuration to ensure proper access controls.

Long-Term Security Practices

Regularly review and update access control configurations for web applications.
Conduct security assessments to identify and address misconfigurations that could lead to access control bypass.

Patching and Updates

Apply security patches and updates promptly to address known vulnerabilities and enhance system security.