CVE-2020-13639 : Exploit Details and Defense Strategies

A stored XSS vulnerability in the ECT Provider in OutSystems before 2020-09-04 allows remote attackers to execute malicious JavaScript in an administrator's browser.

Understanding CVE-2020-13639

This CVE describes a stored XSS vulnerability in OutSystems that affects generated applications.

What is CVE-2020-13639?

The vulnerability allows unauthenticated remote attackers to craft and store malicious Feedback content into /ECT_Provider/, leading to the execution of attacker-controlled JavaScript in the security context of an administrator's browser.

The Impact of CVE-2020-13639

Attackers can execute malicious JavaScript in the browser of an administrator viewing the content.
Only administrators can view the content, limiting the scope of potential victims.

Technical Details of CVE-2020-13639

OutSystems versions before specific updates are affected by this vulnerability.

Vulnerability Description

The vulnerability allows attackers to store malicious content that executes JavaScript in the context of an administrator's browser.

Affected Systems and Versions

Outsystems 10.0.1005.2
Outsystems 11.9.0 Platform Server
Outsystems 11.7.0 LifeTime Management Console

Exploitation Mechanism

Attackers can craft and store malicious Feedback content into /ECT_Provider/ to trigger the execution of attacker-controlled JavaScript.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update OutSystems to the fixed versions mentioned above.
Monitor administrator accounts for any suspicious activities.

Long-Term Security Practices

Regularly educate administrators on identifying and avoiding phishing attempts.
Implement strict content validation mechanisms to prevent the storage of malicious scripts.

Patching and Updates

Apply the necessary patches and updates provided by OutSystems to mitigate the vulnerability effectively.