CVE-2020-26176 Explained : Impact and Mitigation

An issue was discovered in tangro Business Workflow before 1.18.1 where access control checks are missing on the /api/document/<DocumentID>/attachments API endpoint, allowing attackers to list attachments of workitems they do not own.

Understanding CVE-2020-26176

This CVE identifies a vulnerability in tangro Business Workflow that enables unauthorized access to attachment IDs.

What is CVE-2020-26176?

The vulnerability in tangro Business Workflow before version 1.18.1 allows attackers to view attachment IDs of workitems they do not have access to, compromising data confidentiality.

The Impact of CVE-2020-26176

The vulnerability has a CVSS base score of 4.3, with low confidentiality impact and no integrity impact. Attackers with low privileges can exploit this issue over the network without user interaction.

Technical Details of CVE-2020-26176

This section delves into the technical aspects of the CVE.

Vulnerability Description

The lack of access control checks on the /api/document/<DocumentID>/attachments API endpoint enables attackers to gather valid attachment IDs for workitems not assigned to them.

Affected Systems and Versions

Product: tangro Business Workflow
Vendor: tangro
Versions affected: All versions before 1.18.1

Exploitation Mechanism

Attackers exploit the vulnerability by knowing a document ID, allowing them to list all attachments of a workitem, including their respective IDs.

Mitigation and Prevention

Protecting systems from CVE-2020-26176 is crucial to prevent unauthorized access and data breaches.

Immediate Steps to Take

Update tangro Business Workflow to version 1.18.1 or newer to mitigate the vulnerability.
Implement proper access controls and authentication mechanisms to restrict unauthorized access.

Long-Term Security Practices

Regularly monitor and audit access to sensitive data and attachments.
Conduct security training for users to raise awareness of data protection practices.

Patching and Updates

Stay informed about security updates and patches released by tangro to address vulnerabilities like CVE-2020-26176.