Crisp Client Content-Security-Policy Bypass Scanner

Crisp Client is a widely-used customer communication tool that allows businesses to engage with their customers through live chat and multichannel messaging. It is employed by customer support teams to streamline communications and enhance customer experience. By integrating with various platforms, Crisp Client facilitates seamless interactions across digital assets. It serves both small businesses and large enterprises aiming to improve customer engagement and support processes. The software is valued for its real-time communication capabilities, ease of use, and ability to consolidate different messaging channels into one interface. Its broad use across industries underlines the importance of security within its framework.

The vulnerability detected in the Crisp Client involves a possible Content-Security-Policy (CSP) Bypass, leading to potential Cross-Site Scripting (XSS) attacks. This can occur when the security headers intended to prevent malicious scripts from executing are improperly configured or bypassed. An attacker can exploit this vulnerability to run arbitrary scripts in the context of the user’s session. This erosion of security can lead to data theft, user impersonation, or deployment of further attacks. Monitoring and patching these weaknesses is crucial to maintaining a secure communication platform.

Technically, the vulnerability is located at the CSP settings endpoint within the Crisp Client framework. The vulnerable parameter includes the script injection point, which can be exploited via manipulated queries. The script source is potentially open to accepting and executing user-supplied content that bypasses CSP protections. The exploitation mechanism involves navigating the client's content via headless browsing techniques to execute harmful scripts. These scripts can trigger unintentional user-engagement patterns and expose sensitive data.

Exploitation of this vulnerability can lead to severe consequences such as unauthorized data exposure, compromise of user account security, and insertion of malicious content. These can result in a loss of customer trust and potential legal implications for the business due to GDPR violations or similar data protection laws. The access attackers gain can extend beyond simple data breaches to broader exploitation including redistribution of malicious payloads to other users. Security incidents also damage the reputation and financial standing of organizations using Crisp Client.

REFERENCES

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