Tumblr API Content-Security-Policy Bypass Scanner

Tumblr is a popular social blogging platform that allows users to post multimedia and other content to a short-form blog. It is widely used by individuals, businesses, and organizations for various purposes, such as sharing personal thoughts, marketing, and community building. The Tumblr API enables developers to access Tumblr's features programmatically, which helps integrate Tumblr functionalities into other applications. Developers use the API to manage blog content, perform actions on users' behalf, and fetch Tumblr data for analysis or display in third-party applications. The API, when implemented correctly, provides a seamless way to leverage Tumblr's features in diverse applications.

Cross-Site Scripting (XSS) is a common vulnerability in web applications that allows attackers to inject scripts into web pages viewed by other users. It can be used to bypass Content-Security-Policy and enable unauthorized script execution. In the context of the Tumblr API, XSS can occur if the API implementation improperly handles user input or script calls, exposing the application to attacks. Attackers can exploit this vulnerability to perform actions like redirecting users, stealing sensitive information, or deploying other malicious payloads. It is crucial for developers to ensure their applications handle all inputs securely to avoid such vulnerabilities.

The Tumblr API CSP Bypass vulnerability involves injecting malicious scripts through the API endpoint. The vulnerability is particularly associated with the misconfiguration or lack of enforcement of Content-Security-Policy headers. By sending crafted requests, an attacker can bypass restrictions and execute arbitrary scripts in the context of the victim's browser. The vulnerable endpoint relies on improperly configured headers that fail to validate or restrict third-party script sources. Remediation involves ensuring that proper CSP headers are implemented and dynamically injected content is sanitized.

Exploiting a CSP Bypass vulnerability can have severe consequences, including unauthorized data access and control over affected web pages. An attacker can manipulate the user's browsing experience, impersonate users, or redirect users to fraudulent websites. The impact extends to potentially stealing session cookies, sensitive data, or deploying further scripts on behalf of the exploited user. Mitigation of such vulnerabilities is necessary to protect users and data integrity.

REFERENCES

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