Open Redirect in a2ui up to 0.10.7

Executive Summary

This vulnerability is an open redirect issue in the a2ui project up to version 0.10.7. The problem occurs in the openUrl function of the file renderers/web_core/src/v0_9/rendering/generic-binder.ts. The function is evaluated at render time rather than during user interaction, causing automatic navigation without user action. This could allow an attacker to redirect users to malicious URLs, such as phishing pages, as soon as a page loads.

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Detection Guidance

To detect this vulnerability, inspect the a2ui project files for the affected component in renderers/web_core/src/v0_9/rendering/generic-binder.ts. Look for the openUrl function and check if it is called during render time without user interaction. Review network logs for unexpected redirects or navigation actions triggered by page rendering.

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Impact Analysis

This vulnerability could allow attackers to trick users into visiting malicious websites by automatically redirecting them when a page loads. Users might unknowingly land on phishing pages or sites hosting malware. While browser pop-up blockers may reduce some risks, the issue still enables unauthorized navigation, potentially leading to data theft or further exploitation.

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Mitigation Strategies

Restrict the openUrl function to user-initiated contexts only, such as click handlers. Avoid calling it during render time. Update to the latest version of a2ui if a patch is released. Monitor for unusual navigation activity in your application logs.

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