Gravatar Secure Content-Security-Policy Bypass Scanner

Gravatar Secure is commonly used in digital platforms where personalized user images are integrated into profiles. Developers and website administrators choose Gravatar Secure for its streamlined service of associating avatar images with user email addresses globally. It's frequently integrated into content management systems, forums, and social networks to enhance user profiles and branding. Gravatar Secure allows seamless and automatic user experience across different platforms by using a universal avatar image system. Organizations employ this service to ensure consistent user identification and engagement across various web platforms. The ease of adoption and integration makes Gravatar Secure a popular choice among small to medium-sized enterprises and open-source projects.

The identified vulnerability within Gravatar Secure revolves around a Content-Security-Policy (CSP) bypass, enabling Cross-Site Scripting (XSS) attacks. XSS vulnerabilities occur when an attacker injects malicious scripts into content from dynamic web applications. This vulnerability allows attackers to execute arbitrary scripts in a user's browser, potentially hijacking user sessions or redirecting users to malicious sites. CSP is typically utilized to mitigate XSS risks by restricting script behaviors; however, a bypass can render these protections ineffective. The Gravatar Secure CSP bypass specifically leverages script injection via a compromised content policy, facilitating exploitation. Moreover, such vulnerabilities are often due to misconfigurations or inadequate validation processes in web applications.

The CSP bypass vulnerability involves inserting a malicious script into the website through insecure endpoints. The vulnerable point identified utilizes the gravatar.com domain in the "Content-Security-Policy" header, which allows the execution of unintended scripts due to misconfigurations. Technically, the injection vector used is a script tag that executes an alert within the scope of the Gravatar Secure website. The problematic parameter appears due to insufficiently stringent CSP policies that fail to block such injection attempts effectively. Furthermore, the template shows that the vulnerability can be triggered using a headless browser to navigate and confirm script execution. Detecting this vulnerability involves ensuring a successful bypass of CSP through strategic script injections and confirmations.

When an attacker successfully exploits this CSP bypass vulnerability, various adverse effects may occur. The most concerning impact is the execution of unauthorized scripts in the context of the user’s session, leading to session hijacking or theft of sensitive information. Attackers could also leverage this to deface the website, collect credentials through phishing techniques, or deploy further exploits. This scenario can lead to a loss of user trust, reputational damage, and potential regulatory fines for stored user data breaches. Furthermore, compromised websites might unknowingly host or distribute malware, elevating risks for both site visitors and administrators. Organizations may face increased remediation costs and delays if exploitation goes undetected or unaddressed.

REFERENCES

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