AliExpress ACS Content-Security-Policy Bypass Scanner

AliExpress ACS is part of the AliExpress platform, a widely used online retail service owned by the Alibaba Group. It serves both individual consumers and businesses, facilitating global commerce through its digital marketplace. The ACS component is designed to manage and enforce security policies to ensure safe transactions. It is utilized predominantly by developers and security teams within the AliExpress ecosystem to maintain platform integrity. This service is critical in preventing security breaches and safeguarding user data from potential threats. Given its role in security management, ACS's robustness directly impacts the cybersecurity posture of the entire AliExpress system.

The vulnerability detected is Cross-Site Scripting (XSS), which permits attackers to inject malicious scripts into web pages viewed by other users. This type of attack can be used to steal cookies, session tokens, or other sensitive information stored by users' browsers. In the context of AliExpress ACS, such vulnerabilities could allow adversaries to bypass content security policies designed to block unauthorized scripts. The capability to exploit CSP bypasses XSS vulnerabilities could lead to significant data breaches or unauthorized actions on users' accounts. It is essential to address these vulnerabilities to preserve the confidentiality and integrity of users' interactions on the AliExpress platform.

The vulnerability is due to a CSP Bypass allowing XSS on the AliExpress ACS platform. This weakness is exploited through injecting malicious scripts that bypass existing Content-Security-Policies. The endpoint targeted in this scenario typically processes web requests and responses that manipulate security policies. Attackers can utilize this entry point to execute scripts in the user' browsers by leveraging JSONP as illustrated in the provided payload. The parameter involved in the vulnerability can involve specific query elements containing or redirecting to unauthorized scripts. This exploitation path requires validation of any inputs that potentially affect CSP and ensure robust filtering of unexpected or harmful content.

When exploited, this vulnerability allows attackers to execute scripts in the context of users' browsing sessions. Such an attack could lead to credential stealing, session hijacking, and other unauthorized activities within the AliExpress platform. User trust may be significantly compromised if attackers deploy social engineering tactics via injected scripts. The financial repercussions could also be substantial, given the potential for unauthorized transactions performed using compromised user accounts. Additionally, there is a heightened risk of data privacy violations, which could involve legal ramifications for AliExpress. Ensuring the early detection and rectification of this vulnerability is paramount to safeguarding AliExpress's reputation and user base.

REFERENCES

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