Naver Like Content-Security-Policy Scanner

Naver is a widely used South Korean online platform offering various services, including web search, news, blogs, and webtoons. It is utilized by millions of users primarily in South Korea for personal and business purposes. The platform is accessed via web browsers and mobile applications, playing a crucial role in digital interaction. Companies and individuals rely on it for content distribution, marketing, and information retrieval. Due to its broad reach, maintaining the security of Naver is essential to protect sensitive user data and prevent unauthorized access. This importance makes regular security checks a critical part of managing digital assets using Naver.

The vulnerability detected in this case involves a potential bypass of the Content-Security-Policy (CSP) in the Naver-like implementation. CSP is a security feature deployed in web applications to prevent Cross-Site Scripting (XSS) attacks by controlling the resources which can be loaded. A bypass in CSP allows attackers to execute unintended scripts in the context of the user's browser, posing significant security risks. This vulnerability is specifically targeted at Naver-like or similar CSP implementations. Identifying and preventing such bypasses is vital to ensure web application security and protect against malicious scripts. CSP weaknesses can lead to serious data breaches and unauthorized access to sensitive information.

Technically, the vulnerability affects web pages that use Naver-like CSP settings, which can be exploited through crafted script injections. The vulnerable endpoint is generally the web page itself, which incorrectly implements CSP allowing external scripts. Potentially the vulnerability can be triggered by modifying CSP directives to allow unsafe inline scripts or allowing script sources from untrusted domains. Exploitation typically involves injecting a script tag or similar payload into the web page. In practice, using a bypassing payload such as '' can allow an attacker to execute arbitrary scripts. The vulnerability primarily relies on poor CSP configurations that do not strictly enforce script sources.

When exploited, this vulnerability could lead to severe consequences such as unauthorized execution of scripts in a user's browser. This can result in session hijacking, data theft, defacement, or unauthorized actions within the application. Users could unknowingly have their interactions monitored or data compromised. Moreover, it could expose sensitive business information or user data to unauthorized third parties. The trust in web applications could be undermined, leading to reputational damage for service providers. In some cases, financial losses may also occur if sensitive information like credentials is stolen.

REFERENCES

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