Revive Adserver is an open-source platform used by advertisers and publishers to serve ads on websites and applications. It is commonly deployed by digital marketing teams to manage advertising campaigns and generate revenue. This product is widely used in online marketing, supporting a variety of ad formats and targeting options. Its vulnerability impacts web servers and networks where ad traffic is a major revenue source. Versions before 5.4.2 are particularly affected by the discovered XSS vulnerability.
The vulnerability allows attackers to inject malicious scripts into the web browser of an unsuspecting user. This XSS vulnerability is triggered when users visit specific URLs that contain harmful code. The issue arises from improper sanitization of user inputs in certain scripts within Revive Adserver. Exploiting this vulnerability enables unauthorized script execution in the user's browser.
The issue stems from a lack of input validation in Revive Adserver’s web application. Specifically, the "al.php" script fails to properly sanitize input, which allows malicious JavaScript to be executed via the "closetext" parameter. Attackers can craft a URL that, when accessed by a user, triggers the XSS attack by injecting a <script> tag. The vulnerable endpoint is accessible via public URLs, making it easier for attackers to target users of this ad server.
If exploited, this vulnerability allows attackers to execute arbitrary JavaScript in the victim's browser, leading to session hijacking, phishing attacks, or unauthorized actions within the context of the affected website. Attackers could impersonate legitimate users, steal sensitive information, or manipulate ad campaigns without detection.
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References:
- Upgrade Revive Adserver to version 5.4.2 or later to patch the vulnerability.
- Ensure proper input validation and sanitization of all user-supplied data.
- Implement Content Security Policy (CSP) to reduce the risk of script injection.
- Regularly audit and monitor your web applications for security vulnerabilities.
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