CVE-2022-24825 : What You Need to Know

Smokescreen SSRF via deny list bypass

Understanding CVE-2022-24825

A vulnerability has been identified in Smokescreen, a simple HTTP proxy developed by Stripe, allowing attackers to bypass the deny list feature.

What is CVE-2022-24825?

Smokescreen is a tool designed to prevent server-side request forgery (SSRF) attacks by obscuring URLs. An issue in versions prior to 0.0.3 allowed attackers to bypass the deny list by manipulating input.

The Impact of CVE-2022-24825

The vulnerability poses a medium severity risk with a CVSS base score of 5.8. Attackers can exploit this flaw to connect to or scan internal infrastructure, compromising the confidentiality of user data.

Technical Details of CVE-2022-24825

Vulnerability Description

The vulnerability in Smokescreen enables attackers to append a dot to user-supplied URLs or alter letter cases to evade the deny list feature, providing unauthorized access.

Affected Systems and Versions

Smokescreen versions prior to 0.0.3 are affected by this vulnerability, exposing users to potential SSRF attacks.

Exploitation Mechanism

Attackers can exploit this SSRF vulnerability by manipulating input to bypass the deny list and gain unauthorized access to URLs, compromising security.

Mitigation and Prevention

Immediate Steps to Take

Users are strongly advised to upgrade Smokescreen to version 0.0.3 or later to remediate this vulnerability and prevent SSRF attacks.

Long-Term Security Practices

Implement strict input validation protocols and regularly update security tools to mitigate the risk of SSRF attacks in the long term.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by Stripe to ensure continuous protection against vulnerabilities.