QID 150516

Date Published: 2022-08-25

QID 150516: Web Application External URL Redirection

External redirected links were discovered during the scan and are listed in the Results section.

Attackers can use external redirects without validation to redirect a user to a malicious URL. For example, if the trusted application is https://X.X.X.TrustQualys/test?url=qualys.com, the user is navigating to https://X.X.X.TrustQualys, and it is a trusted domain. However, there is an invalidated redirect, and the attacker can manipulate the redirection. The attacker can use this link https://X.X.X.TrustQualys/test?url=X.X.XReallyBadApp.com (for this example, ReallyBadApp is used, savvy malicious attackers will use more legitimate looking values) where the customer may be redirected to an external entity X.X.XReallyBadApp.com. This unintended redirect may lead to fishing or malware. Since the user was redirected from a trusted application, the user may be more willing to provide information.

Solution

As a standard avoid using external redirects and forwards in the application when possible. As a standard, avoid external redirects and forwards in the application when possible. Applications often are designed to redirect the user within the application and trusted external URLs. If a redirect parameter is used, ensure that the supplied value is valid and filtered based on trusted URLs. Setting up a whitelist would be most applicable to this technique. Reference: Unvalidated_Redirects_and_Forwards_Cheat_Sheet

Vendor References

CVEs related to QID 150516

Software Advisories

Advisory ID	Software	Component	Link

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