CVE-2023-50266 Explained : Impact and Mitigation

A critical vulnerability has been identified in Bazarr, a tool for managing and downloading subtitles, specifically affecting version 1.2.4. This vulnerability allows an attacker to perform a Blind Server-Side Request Forgery (SSRF) attack, potentially leading to unauthorized access to internal and external resources. The CVE-2023-50266 marks the severity as MEDIUM with a CVSS base score of 5.3.

Understanding CVE-2023-50266

This section delves into the details of the Blind Server-Side Request Forgery (SSRF) vulnerability in Bazarr version 1.2.4.

What is CVE-2023-50266?

CVE-2023-50266 is a Server-Side Request Forgery (SSRF) vulnerability in Bazarr's /test/<protocol>/ endpoint, allowing attackers to manipulate GET requests to access sensitive resources.

The Impact of CVE-2023-50266

The impact of this vulnerability is significant as it enables unauthorized access to both internal and external resources through the affected server, posing a risk to data confidentiality.

Technical Details of CVE-2023-50266

This section outlines key technical details of the CVE-2023-50266 vulnerability in Bazarr.

Vulnerability Description

In Bazarr version 1.2.4, the proxy method in bazarr/bazarr/app/ui.py fails to validate user-controlled protocol and URL variables, leading to a blind SSRF exploit. Version 1.3.1 includes a partial fix, restricting the vulnerability to HTTP/HTTPS protocols.

Affected Systems and Versions

Vendor morpheus65535's product Bazarr version 1.2.4 is confirmed to be affected by this SSRF vulnerability.

Exploitation Mechanism

The exploitation of CVE-2023-50266 involves crafting malicious GET requests that leverage the SSRF flaw to access resources on behalf of the server, giving unauthorized access.

Mitigation and Prevention

Learn how to mitigate and prevent potential threats resulting from CVE-2023-50266.

Immediate Steps to Take

Users should update to Bazarr version 1.3.1 to apply the partial fix that limits the vulnerability to HTTP/HTTPS protocols. Additionally, restrict access to the affected endpoint to trusted sources.

Long-Term Security Practices

Adopt a proactive security approach by regularly updating software, conducting security audits, and educating users on SSRF risks to enhance overall security posture.

Patching and Updates

Stay informed about security updates and patches released by Bazarr to address known vulnerabilities and strengthen the application's security defenses.