Revive Adserver is a popular open-source advertising server software that is widely used to manage and deliver online advertising campaigns. It is primarily used by websites, mobile apps, and other digital channels to display advertisements to users. The software is designed to enable publishers to serve ads to different types of devices, offer various ad formats, and provide in-depth reporting and analytics.
CVE-2021-22873 is a recent vulnerability discovered in Revive Adserver, which can potentially enable attackers to launch open redirects via the `dest`, `oadest`, and/or `ct0` parameters of the lg.php and ck.php delivery scripts. This exploit can be used to redirect users to malicious websites or phishing pages, leading to information theft, malware attacks, or financial fraud.
Exploiting this vulnerability can lead to a variety of consequences for both publishers and website visitors. Attackers can hijack user sessions, steal personal information, create fake login pages, and introduce malware to users' devices. In addition, such malicious activity can result in the suspension, fines, or even legal action against the website or app that hosts the vulnerable advertising server.
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REFERENCES
- https://hackerone.com/reports/1081406
- https://www.revive-adserver.com/security/revive-sa-2021-001/
- https://github.com/revive-adserver/revive-adserver/issues/1068
- seclists.org: 20210122 [REVIVE-SA-2021-001] Revive Adserver Vulnerabilities
- http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
To protect against this vulnerability, security experts recommend taking the following precautions:
- Update Revive Adserver to the latest version (5.1.0 or later) as soon as possible.
- Monitor server logs and firewall settings for unusual activity or traffic spikes.
- Implement strong access controls, including multi-factor authentication and role-based access control.
- Train employees and users on how to identify and avoid phishing attacks and suspicious links.
- Regularly scan the server for vulnerabilities and apply patches and updates promptly.
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