CVE-2024-1800: Progress Telerik Report Server RCE Flaw

CVE-2024-1800 Overview

CVE-2024-1800 is an insecure deserialization vulnerability affecting Progress® Telerik® Report Server versions prior to 2024 Q1 (10.0.24.130). This critical flaw allows authenticated attackers to achieve remote code execution on vulnerable servers by exploiting improper handling of serialized data. Organizations using affected versions of Telerik Report Server should prioritize patching, as insecure deserialization vulnerabilities are commonly weaponized by threat actors to gain full control of target systems.

Critical Impact

Successful exploitation enables remote code execution with the privileges of the Report Server service account, potentially leading to complete system compromise, data exfiltration, and lateral movement within enterprise networks.

Affected Products

• Progress Telerik Report Server versions prior to 2024 Q1 (10.0.24.130)
• All earlier releases of Progress Telerik Report Server
• Deployments using vulnerable serialization components

Discovery Timeline

• 2024-03-20 - CVE-2024-1800 published to NVD
• 2025-01-16 - Last updated in NVD database

Technical Details for CVE-2024-1800

Vulnerability Analysis

This vulnerability stems from insecure deserialization (CWE-502) within Progress Telerik Report Server. The flaw allows authenticated attackers with network access to submit maliciously crafted serialized objects to the server. When the application deserializes this untrusted data without proper validation, it can instantiate arbitrary objects and execute attacker-controlled code within the server's execution context.

Insecure deserialization vulnerabilities in .NET applications like Telerik Report Server are particularly dangerous because they can leverage gadget chains within the .NET framework or third-party libraries to achieve code execution. The attack requires low privileges and no user interaction, making exploitation straightforward once an attacker has authenticated access to the application.

Root Cause

The root cause is the application's failure to properly validate and sanitize serialized data before deserialization. Telerik Report Server accepts serialized objects through network-accessible endpoints without implementing adequate type restrictions or input validation. This allows attackers to inject malicious object graphs that, when deserialized, trigger arbitrary code execution through .NET deserialization gadgets.

Attack Vector

The attack is network-based, requiring an authenticated attacker to send specially crafted serialized payloads to vulnerable Telerik Report Server endpoints. The exploitation process typically involves:

1. Authenticating to the Telerik Report Server with valid (potentially low-privileged) credentials
2. Identifying deserialization endpoints that accept serialized data
3. Crafting a malicious serialized payload using known .NET deserialization gadgets
4. Submitting the payload to trigger code execution on the server

The vulnerability does not require user interaction and can be exploited with low attack complexity once authentication is achieved. Successful exploitation grants attackers the ability to execute arbitrary commands with the privileges of the service account running Telerik Report Server.

Detection Methods for CVE-2024-1800

Indicators of Compromise

• Unusual process spawning from the Telerik Report Server application pool or service process
• Unexpected network connections originating from the Report Server to external hosts
• Creation of new files, scripts, or executables in Report Server directories or system locations
• Anomalous serialization-related error messages in application logs
• Evidence of reconnaissance or credential harvesting activities initiated from the server

Detection Strategies

• Monitor for suspicious .NET deserialization patterns in web application firewall (WAF) logs
• Implement application-level logging to capture deserialization events and payload characteristics
• Deploy endpoint detection and response (EDR) solutions to detect post-exploitation behaviors
• Analyze process creation events for child processes spawned by IIS application pools serving Report Server
• Review authentication logs for unusual login patterns followed by suspicious server-side activity

Monitoring Recommendations

• Enable verbose logging on Telerik Report Server and forward logs to SIEM for analysis
• Configure alerts for process creation events associated with Report Server service accounts
• Monitor network traffic for command-and-control indicators originating from Report Server hosts
• Implement file integrity monitoring on Report Server installation directories
• Track authentication events and correlate with subsequent server-side activities

How to Mitigate CVE-2024-1800

Immediate Actions Required

• Upgrade Progress Telerik Report Server to version 2024 Q1 (10.0.24.130) or later immediately
• Audit existing Report Server deployments to identify all instances requiring patching
• Review authentication logs to identify any suspicious activity that may indicate prior exploitation
• Restrict network access to Report Server to trusted IP ranges where feasible
• Implement strong authentication controls and limit user accounts with server access

Patch Information

Progress has addressed this vulnerability in Telerik Report Server version 2024 Q1 (10.0.24.130). Organizations should upgrade to this version or later to remediate CVE-2024-1800. Detailed patching instructions and additional security guidance are available in the Telerik CVE-2024-1800 Advisory.

Workarounds

• Restrict network access to Telerik Report Server by placing it behind a VPN or firewall with strict access controls
• Implement web application firewall (WAF) rules to inspect and block suspicious serialized payloads
• Apply the principle of least privilege to Report Server service accounts to limit post-exploitation impact
• Consider temporarily disabling public-facing access to Report Server until patching can be completed
• Enable enhanced logging and monitoring to detect exploitation attempts

# Example: Restrict Report Server access using Windows Firewall
# Block external access to Report Server port (default 83)
netsh advfirewall firewall add rule name="Block External Report Server" dir=in action=block protocol=tcp localport=83 remoteip=any
# Allow access only from trusted internal subnet
netsh advfirewall firewall add rule name="Allow Internal Report Server" dir=in action=allow protocol=tcp localport=83 remoteip=10.0.0.0/8