Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists in Progress Telerik UI for AJAX that allows attackers to execute arbitrary code on the server. This occurs when the RadFilter control improperly handles its state, making it susceptible to tampering if exposed to clients. This issue warrants immediate attention due to the potential for significant server-side compromise.
- Remote code execution is possible.
- Affects web applications using the control.
- Reachable from the internet.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can achieve remote code execution by manipulating the filter state of the Telerik UI for AJAX control. This state, if exposed client-side, can be tampered with and then sent back to the server, triggering insecure deserialization. Successful exploitation would allow an attacker to run arbitrary code on the affected server.
- No authentication required.
- Target: RadFilter control's client-side state.
- State exposure to client is key.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability presents a significant risk due to its remote code execution capabilities without requiring user interaction or prior privileges, affecting a widely used UI component. Attackers are likely to target this because it allows for direct server compromise through a network-accessible vulnerability in a common web application component.
- No authentication required for exploitation.
- No user interaction needed.
- Public exploit availability is unknown.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Teams should prioritize blocking access to the RadFilter control and investigating which services use Telerik UI for AJAX, as unpatched versions allow unauthenticated remote code execution. Review logs for signs of the deserialization vulnerability being exploited, focusing on requests where filter state might be manipulated.
- Isolate or disable Telerik UI if patching is delayed.
- Block network access to RadFilter.
- Monitor for exploit indicators.
