CVE-2024-8069: Citrix Session Recording Auth Bypass Flaw

CVE-2024-8069 Overview

CVE-2024-8069 is an insecure deserialization vulnerability in Citrix Session Recording that allows limited remote code execution with the privileges of a NetworkService Account. This vulnerability requires the attacker to be an authenticated user on the same intranet as the session recording server, making it exploitable within adjacent network environments.

Critical Impact

This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. Organizations using affected versions of Citrix Session Recording should prioritize remediation immediately.

Affected Products

• Citrix Session Recording versions before 2407 (Current Release)
• Citrix Session Recording 2402 LTSR before CU1
• Citrix Session Recording 2203 LTSR before CU5
• Citrix Session Recording 1912 LTSR before CU9

Discovery Timeline

• November 12, 2024 - CVE-2024-8069 published to NVD
• October 24, 2025 - Last updated in NVD database

Technical Details for CVE-2024-8069

Vulnerability Analysis

CVE-2024-8069 stems from an insecure deserialization flaw (CWE-502) in the Citrix Session Recording component. When the application processes serialized data from authenticated users on the same network segment, it fails to properly validate or sanitize the incoming data before deserialization. This allows an attacker to craft malicious serialized objects that, when deserialized by the application, execute arbitrary code in the context of the NetworkService Account.

The exploitation requires adjacent network access, meaning the attacker must be on the same local network or intranet as the Session Recording server. Additionally, the attacker needs valid authentication credentials, which limits the attack surface compared to unauthenticated remote code execution vulnerabilities.

Root Cause

The root cause is classified as CWE-502: Deserialization of Untrusted Data. The Citrix Session Recording application deserializes data without sufficient validation, allowing attackers to inject malicious serialized objects. When the application processes these objects, it instantiates classes and executes methods specified in the malicious payload, leading to code execution.

Insecure deserialization vulnerabilities occur when applications accept serialized objects from untrusted sources without proper integrity checks or type restrictions. In this case, the Session Recording service processes serialized data that can be manipulated by authenticated users within the network.

Attack Vector

The attack requires adjacent network positioning (same intranet as the Session Recording server) and authenticated access. An attacker with these prerequisites can craft a malicious serialized payload targeting the deserialization endpoint in the Citrix Session Recording service.

The exploitation flow involves:

1. An authenticated attacker on the same network segment identifies the Session Recording server
2. The attacker crafts a malicious serialized object containing code execution primitives
3. The payload is sent to the vulnerable deserialization endpoint
4. The Session Recording service deserializes the malicious object
5. Code execution occurs with NetworkService Account privileges

The vulnerability mechanism involves unsafe deserialization of user-controlled data. Attackers can leverage known .NET deserialization gadgets to achieve code execution when the application processes malicious serialized objects. For detailed technical analysis, refer to the Citrix Security Bulletin.

Detection Methods for CVE-2024-8069

Indicators of Compromise

• Unusual network traffic to the Session Recording server from internal hosts
• Unexpected processes spawned by the Session Recording service running as NetworkService
• Anomalous PowerShell or cmd.exe execution originating from the Session Recording process
• Suspicious serialized data payloads in network captures targeting Session Recording endpoints

Detection Strategies

• Monitor for deserialization-related exceptions and errors in Citrix Session Recording logs
• Implement network segmentation monitoring to detect lateral movement attempts targeting Session Recording servers
• Deploy endpoint detection rules for known .NET deserialization gadget chains
• Configure SIEM alerts for unusual process creation events from the Session Recording service

Monitoring Recommendations

• Enable verbose logging on Citrix Session Recording servers to capture authentication and data processing events
• Monitor Windows Security Event logs for NetworkService account activity anomalies
• Implement network traffic analysis for adjacent network segments where Session Recording servers reside
• Review authentication logs for unusual access patterns from internal users

How to Mitigate CVE-2024-8069

Immediate Actions Required

• Identify all Citrix Session Recording installations in your environment and verify version numbers
• Apply the latest security patches from Citrix immediately as this vulnerability is actively exploited
• Restrict network access to Session Recording servers to only necessary systems and users
• Review and audit user accounts with access to the Session Recording infrastructure

Patch Information

Citrix has released security updates to address this vulnerability. Organizations should update to the following versions:

• Current Release: Update to Citrix Session Recording version 2407 or later
• 2402 LTSR: Apply Cumulative Update 1 (CU1) or later
• 2203 LTSR: Apply Cumulative Update 5 (CU5) or later
• 1912 LTSR: Apply Cumulative Update 9 (CU9) or later

For complete patch details and download links, refer to the Citrix Security Bulletin CTX691941.

Workarounds

• Implement strict network segmentation to isolate Session Recording servers from general user networks
• Apply firewall rules to restrict access to Session Recording services from trusted hosts only
• Monitor and audit all authenticated user activity on systems with access to the Session Recording server
• Consider temporarily disabling Session Recording functionality if patching cannot be performed immediately

# Example: Windows Firewall rule to restrict Session Recording access
netsh advfirewall firewall add rule name="Restrict Session Recording Access" dir=in action=block protocol=tcp localport=<session_recording_port> remoteip=any
netsh advfirewall firewall add rule name="Allow Session Recording from Trusted" dir=in action=allow protocol=tcp localport=<session_recording_port> remoteip=<trusted_ip_range>