CVE-2024-0799: Arcserve UDP Auth Bypass Vulnerability

CVE-2024-0799 Overview

CVE-2024-0799 is a critical authentication bypass vulnerability affecting Arcserve Unified Data Protection (UDP) versions 9.2 and 8.1. The flaw exists in the edge-app-base-webui.jar!com.ca.arcserve.edge.app.base.ui.server.EdgeLoginServiceImpl.doLogin() function within the wizardLogin component. This vulnerability allows unauthenticated remote attackers to bypass authentication mechanisms and gain unauthorized access to the backup and disaster recovery platform.

Critical Impact

Successful exploitation of this authentication bypass vulnerability could allow attackers to gain complete control over Arcserve UDP backup infrastructure, potentially leading to data theft, ransomware deployment, or destruction of backup data critical for disaster recovery operations.

Affected Products

• Arcserve Unified Data Protection (UDP) 9.2
• Arcserve Unified Data Protection (UDP) 8.1

Discovery Timeline

• 2024-03-13 - CVE-2024-0799 published to NVD
• 2025-10-14 - Last updated in NVD database

Technical Details for CVE-2024-0799

Vulnerability Analysis

This authentication bypass vulnerability (CWE-287: Improper Authentication) resides in the Java-based web user interface component of Arcserve Unified Data Protection. The vulnerable code is located within the EdgeLoginServiceImpl class, specifically in the doLogin() method that handles the wizardLogin functionality.

The vulnerability allows attackers to circumvent the normal authentication flow, enabling unauthorized access to the backup management console without providing valid credentials. Given that Arcserve UDP is an enterprise backup and disaster recovery solution, successful exploitation could have severe consequences for organizations relying on it to protect critical data assets.

The network-accessible nature of this vulnerability means it can be exploited remotely without requiring any prior authentication or user interaction. This makes it particularly dangerous in environments where the Arcserve UDP management interface is exposed to untrusted networks.

Root Cause

The root cause of this vulnerability lies in improper authentication validation within the wizardLogin function of the EdgeLoginServiceImpl.doLogin() method. The code fails to properly verify authentication credentials or session tokens before granting access to protected functionality. This type of authentication bypass typically occurs when alternative authentication paths or setup wizards do not enforce the same security controls as the primary login mechanism.

Attack Vector

The attack vector for CVE-2024-0799 is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted requests to the Arcserve UDP web interface targeting the wizardLogin endpoint. The exploitation flow typically involves:

1. Identifying an exposed Arcserve UDP management interface (typically on ports 8014 or 8015)
2. Crafting requests that target the vulnerable wizardLogin authentication path
3. Bypassing authentication to gain administrative access to the backup infrastructure
4. Leveraging access to exfiltrate backup data, modify backup configurations, or deploy malicious payloads

For detailed technical information regarding this vulnerability, refer to the Tenable Security Research Advisory.

Detection Methods for CVE-2024-0799

Indicators of Compromise

• Unexpected authentication success events in Arcserve UDP logs without corresponding valid credential submissions
• Suspicious access to the wizardLogin endpoint from external or unexpected IP addresses
• Anomalous administrative actions performed without preceding legitimate login sessions
• Unauthorized changes to backup job configurations, retention policies, or recovery point objectives

Detection Strategies

• Monitor web server access logs for requests to /wizardLogin or related setup wizard endpoints
• Implement network intrusion detection rules to identify authentication bypass attempts targeting Arcserve UDP
• Deploy application-level logging to track all authentication events and correlate with expected user activity
• Use SentinelOne Singularity to detect post-exploitation behaviors such as unusual process spawning or data exfiltration attempts from Arcserve UDP servers

Monitoring Recommendations

• Enable verbose logging on Arcserve UDP management interfaces to capture all authentication attempts
• Configure SIEM alerts for multiple failed authentication attempts followed by successful access
• Monitor network traffic to and from Arcserve UDP servers for unusual patterns or data volumes
• Implement file integrity monitoring on Arcserve UDP configuration files and binaries

How to Mitigate CVE-2024-0799

Immediate Actions Required

• Identify all Arcserve UDP 8.1 and 9.2 installations within your environment
• Restrict network access to Arcserve UDP management interfaces using firewall rules, allowing only trusted administrator IP addresses
• Apply the latest security patches from Arcserve as soon as they become available
• Review Arcserve UDP audit logs for any signs of unauthorized access or suspicious activity
• Consider temporarily disabling external access to the management interface until patching is complete

Patch Information

Organizations should contact Arcserve directly or visit the Arcserve support portal to obtain the latest security patches addressing CVE-2024-0799. Given the critical severity of this vulnerability, patching should be prioritized immediately. Additional technical details are available in the Tenable Security Research Advisory.

Workarounds

• Implement network segmentation to isolate Arcserve UDP management interfaces from untrusted networks
• Deploy a Web Application Firewall (WAF) in front of Arcserve UDP to filter malicious requests targeting the wizardLogin endpoint
• Use VPN or jump server requirements for administrative access to backup infrastructure
• Enable multi-factor authentication at the network perimeter level for any access to backup management systems

# Example: Restrict access to Arcserve UDP management ports using iptables
# Allow only trusted admin network (example: 10.0.1.0/24)
iptables -A INPUT -p tcp --dport 8014 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8015 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8014 -j DROP
iptables -A INPUT -p tcp --dport 8015 -j DROP