Mail.ru Connect Content-Security-Policy Bypass Scanner

Mail.ru Connect is widely used for communication and collaboration within and across organizations. Corporations employ Mail.ru Connect for its comprehensive suite of efficiency tools aiding emails, chats, and scheduling activities. The usage of Mail.ru Connect spans various industries, enhancing connectivity in both small and large enterprises. With a strong emphasis on user interface and experience, the tool is designed to streamline operations and ensure real-time communication. The product often integrates with other organizational systems to centralize communication functions, reducing the need for multiple platforms. Due to its prevalence, maintaining the security and integrity of Mail.ru Connect services is a critical organizational task.

The vulnerability detected is a cross-site scripting (XSS) loophole, exploitable through bypassing the Content-Security-Policy (CSP) in Mail.ru Connect. When CSP, an essential web security standard, is improperly configured, it can open avenues for execution of unauthorized scripts. This vulnerability imposes a risk of unauthorized data access and manipulation, as scripts can execute without consent of the legitimate users. Attackers can utilize this entry point to inject malicious scripts into user accounts, compromising sensitive information. CSP bypass thus increases the susceptibility of users to various forms of attacks, including session hijacking and phishing. The exploitation usually occurs because of inadequate security evaluations post system alterations or updates.

The technical nature of this vulnerability involves exploiting specific CSP configuration errors that allow external scripts to execute unhindered. The vulnerable endpoints include web page headers that misconfigure 'Content-Security-Policy' directives leading to script injection. Attackers can embed JavaScript via crafted URLs that manipulate the response headers to inject and execute arbitrary code. Upon a successful bypass, the injected script can intercept personal data or impersonate user actions. The parameter in question includes the URL or query strings manipulated as vectors for executing the XSS payload. Compromised configurations, such as failure to specify script sources strictly, more likely enable such bypass opportunities.

When this CSP bypass is exploited, the consequences range from data theft to manipulation of user sessions. Attackers may harvest session cookies or site data and perform actions imitating legitimate users. Entire systems may face degradation as malicious scripts can proliferate, affecting resources and user interactions throughout. Repeated exploitation could degrade trust in secure communication platforms, prompting users to migrate, potentially affecting business operations. Financial implications could arise due to stolen sensitive data or operational downtime forcing costly system restorations. Persistent attacks may also require extensive audits and monitoring to eliminate the penetration route and restore confidence in the system's integrity.

REFERENCES

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