ByteDance SSO Content-Security-Policy Bypass Scanner

ByteDance SSO is a single sign-on solution widely used for seamless authentication across ByteDance ecosystem products. It facilitates secure access to various applications within ByteDance's network. Organizations utilize ByteDance SSO to enhance user convenience and security by centralizing authentication processes. It is particularly popular among enterprises that manage multiple ByteDance applications. By employing ByteDance SSO, companies can reduce security risks associated with decentralized login systems. The solution is continually updated to align with evolving security standards.

A Content-Security-Policy (CSP) bypass vulnerability in ByteDance SSO can allow an attacker to execute cross-site scripting (XSS) attacks. This vulnerability arises from the improper implementation of CSP, which fails to adequately restrict the loading of scripts from untrusted domains. As a consequence, attackers may inject malicious scripts that can compromise the integrity and confidentiality of user data. Detecting this vulnerability is essential to prevent unauthorized access and data breaches. Organizations must regularly assess their CSP configurations to ensure robust security measures are in place.

The vulnerability in ByteDance SSO is caused by the inadequate filtering of user-supplied data within CSP headers. The endpoint affected is related to SSO authentication processes, specifically allowing the injection of scripts from external sources. Technically, this involves manipulating query parameters to exploit CSP weaknesses. The template utilizes a payload that sources a script from "https://sso.bytedance.com," simulating a potential breach point. By leveraging URL encoding, the scanner tests the application's resilience against script injection. The presence of the vulnerability is confirmed if the specified script executes successfully.

Exploitation of this CSP bypass could lead to severe consequences, including unauthorized script execution on vulnerable domains. This may facilitate identity theft, session hijacking, and unauthorized actions on behalf of the user. Additionally, it could undermine trust in affected applications, prompting users to question the security of the service. Financial damages and reputational harm often follow such successful breaches. Organizations might face legal repercussions if user data is compromised due to negligence. Proactive vulnerability management is essential to mitigate these risks.

REFERENCES

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