ULogin Content-Security-Policy Bypass Scanner

ULogin is widely used for integrating social network authentication in web applications, enabling users to log in using existing social media credentials. It is commonly implemented by developers across various industries striving to enhance user experience and authentication security. The service simplifies the OAuth process by providing a unified interface for multiple social networks. However, if improperly configured, it may expose applications to security vulnerabilities, including XSS attacks. IT administrators may use ULogin for streamlining access management through centralized authentication.

The Content-Security-Policy Bypass vulnerability allows attackers to exploit a misconfigured CSP header that references ULogin's domain. This exploitation could lead to unauthorized script execution on a target web application. CSPs are intended to prevent malicious activities like XSS and data injection, but when bypassed, they leave applications vulnerable. Attackers might leverage this weakness to execute scripts that redirect users or steal sensitive information. The presence of this vulnerability is commonly associated with a lack of thorough CSP implementation.

The technical details of the vulnerability involve the ULogin domain being used in conjunction with improperly secured CSP headers. An attacker can craft malicious scripts that pass through CSP filters when these headers do not properly restrict external resource loading. The bypass is achieved by embedding scripts that reference ULogin's domain, triggering actions like pop-up alerts in client browsers. The endpoint typically checked is any URL of a web application integrating ULogin. This script injection can be used to simulate unauthorized user interactions.

When exploited, the CSP bypass can result in unauthorized script execution, potentially compromising user data privacy. Malicious scripts injected into web pages can alter the content viewed by legitimate users, posing reputational risks for affected applications. Users could be unwittingly redirected to phishing sites or exposed to exploit kits. Moreover, attackers can escalate privileges by stealing authentication tokens or session cookies. The vulnerability thus presents risks of financial loss, data breaches, and operational downtime.

REFERENCES

• https://github.com/renniepak/CSPBypass/blob/main/data.tsv