Google Storage Content Security Policy Bypass Scanner
This scanner detects the use of Content-Security-Policy in digital assets. It identifies potential vulnerabilities in CSP implementations that could allow malicious script execution.
Short Info
Level
Single Scan
Single Scan
Can be used by
Asset Owner
Estimated Time
10 seconds
Time Interval
23 days 11 hours
Scan only one
URL
Toolbox
Content-Security-Policy is a mechanism used widely across various web platforms and services to enhance the security of web applications by mitigating various types of attacks, including Cross-Site Scripting (XSS) and data injection attacks. Many companies leverage CSP to control resources the user agent is allowed to load for a web page. It is a declarative policy for web application developers to restrict content that's potentially harmful. Despite its security intentions, improper implementation of CSP could inadvertently allow harmful scripts. Understanding where and how CSP is deployed helps in ensuring its correct implementation in diverse environments, from small scale websites to large-scaled application platforms. DevOps and security teams benefit from automated detection tools to audit and manage CSP rules effectively.
Cross-Site Scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into trusted websites viewed by users. The vulnerability arises when web applications include untrusted data in a web page without proper validation or escaping. Under certain conditions where CSP rules are misconfigured, this allows for scenarios wherein malicious JavaScript execution becomes plausible. Understanding and identifying weak points in CSP that may lead to XSS provides a critical edge in enhancing the robustness of web applications. Proper handling of CSP ensures mitigation against varied forms of XSS attacks that could otherwise compromise user data and site integrity.
The vulnerability permits malicious JavaScript execution by enabling attackers to load scripts from whitelisted domains such as storage.googleapis.com. Technical detection involves checking for the presence of certain CSP headers that may incorrectly allow the execution of arbitrary scripts. Potential points of vulnerability include specific endpoints or parameters where CSP is not correctly enforced. Detection checks for incorrect CSP configurations that could be exploited by attackers, focusing on how CSP rules interact with domain whitelisting. The endpoint's HTTP headers are scrutinized to pinpoint gaps where CSP fails to mitigate script injection effectively.
Should this vulnerability be exploited by malicious actors, there are numerous detrimental effects that could follow. Exploitable CSP can lead to unauthorized access to user information, sidestepping security measures intended to protect web pages and their users. It can facilitate unauthorized activities such as changing site content or stealing credentials by executing harmful scripts. Left unaddressed, this can tarnish trust in web services and lead to significant data breaches or loss of sensitive user information. Further potential impacts include damaging the reputation of affected brands and incurring substantial costs in addressing the aftermath of such vulnerabilities.
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