CVE-2024-28988: SolarWinds Web Help Desk RCE Flaw

CVE-2024-28988 Overview

SolarWinds Web Help Desk was found to be susceptible to a Java Deserialization Remote Code Execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability was discovered by the Trend Micro Zero Day Initiative (ZDI) team after researching a previous vulnerability and providing their findings to SolarWinds. Notably, the ZDI team was able to discover an unauthenticated attack vector during their research, significantly increasing the severity and exploitability of this vulnerability.

Critical Impact

This unauthenticated Java deserialization vulnerability allows remote attackers to execute arbitrary commands on the host machine running SolarWinds Web Help Desk, potentially leading to complete system compromise without requiring any credentials.

Affected Products

• SolarWinds Web Help Desk versions prior to 12.8.3 Hotfix 3
• SolarWinds Web Help Desk 12.8.3 (base version)
• SolarWinds Web Help Desk 12.8.3 Hotfix 1 and Hotfix 2

Discovery Timeline

• Published - CVE-2024-28988 published to NVD
• September 1, 2025 - CVE-2024-28988 published to NVD
• November 14, 2025 - Last updated in NVD database

Technical Details for CVE-2024-28988

Vulnerability Analysis

This vulnerability is classified as an Insecure Deserialization flaw (CWE-502) within SolarWinds Web Help Desk. Java deserialization vulnerabilities occur when an application deserializes untrusted data without proper validation, allowing attackers to manipulate serialized objects to achieve code execution. In this case, the vulnerability is particularly dangerous because it can be exploited without authentication, meaning any network-accessible attacker can potentially compromise the system.

The attack can be conducted remotely over the network with low complexity requirements. No user interaction is required, and successful exploitation results in complete compromise of confidentiality, integrity, and availability of the affected system. The unauthenticated nature of this vulnerability significantly expands the attack surface, as threat actors do not need to obtain valid credentials before launching an attack.

Root Cause

The root cause of CVE-2024-28988 lies in improper handling of serialized Java objects within the SolarWinds Web Help Desk application. When the application processes incoming data streams containing serialized objects, it fails to adequately validate or sanitize the data before deserialization. This allows attackers to craft malicious serialized payloads that, when deserialized by the vulnerable application, execute arbitrary code on the underlying host system.

Java deserialization attacks typically leverage existing classes within the application's classpath (known as "gadget chains") to construct exploitation payloads. These gadget chains can be chained together to achieve various malicious outcomes, including remote command execution.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote exploitation. An attacker can send specially crafted serialized Java objects to the vulnerable Web Help Desk instance over the network. Because the vulnerability is unauthenticated, the attacker does not need valid credentials to initiate the attack.

The exploitation flow typically involves:

1. The attacker identifies a network-accessible SolarWinds Web Help Desk instance
2. The attacker crafts a malicious serialized Java object containing a gadget chain designed to execute commands
3. The malicious payload is sent to the vulnerable endpoint
4. The application deserializes the malicious object without proper validation
5. The gadget chain executes, running attacker-specified commands on the host machine

For detailed technical information, refer to the SolarWinds Security Advisory.

Detection Methods for CVE-2024-28988

Indicators of Compromise

• Unusual Java process behavior or unexpected child processes spawned by the Web Help Desk application
• Suspicious network connections originating from the Web Help Desk server to unknown external IP addresses
• Unexpected file creations or modifications in Web Help Desk installation directories
• Anomalous authentication attempts or access patterns in Web Help Desk logs

Detection Strategies

• Monitor network traffic for suspicious serialized Java object patterns in HTTP requests to Web Help Desk
• Implement application-level logging to capture deserialization events and flag unusual payload sizes or structures
• Deploy endpoint detection and response (EDR) solutions to identify post-exploitation behaviors such as command execution or lateral movement
• Establish baseline behavior for the Web Help Desk application and alert on deviations

Monitoring Recommendations

• Enable verbose logging on Web Help Desk servers and forward logs to a centralized SIEM for analysis
• Configure alerts for any process execution chains involving the Web Help Desk Java process spawning shell interpreters (cmd.exe, bash, PowerShell)
• Monitor for network connections to known malicious infrastructure or unusual outbound traffic patterns
• Regularly audit Web Help Desk server file systems for unauthorized changes or new files

How to Mitigate CVE-2024-28988

Immediate Actions Required

• Apply Hotfix 3 for Web Help Desk version 12.8.3 immediately to address this vulnerability
• If immediate patching is not possible, consider temporarily restricting network access to Web Help Desk instances
• Conduct a security audit of Web Help Desk servers to identify any signs of compromise
• Review and strengthen network segmentation to limit exposure of Web Help Desk to untrusted networks

Patch Information

SolarWinds has released Hotfix 3 for Web Help Desk version 12.8.3 that addresses this vulnerability. All Web Help Desk customers are strongly recommended to apply this patch immediately. The hotfix is available through the SolarWinds Support Center. Organizations should prioritize this patch given the unauthenticated nature of the vulnerability and its critical severity rating.

Workarounds

• Restrict network access to the Web Help Desk application using firewall rules, allowing only trusted IP ranges
• Place Web Help Desk behind a web application firewall (WAF) configured to inspect and block suspicious serialized Java payloads
• Implement network segmentation to isolate Web Help Desk from critical infrastructure until patching is complete
• Enable enhanced monitoring and logging on Web Help Desk servers to detect exploitation attempts

# Example: Restrict access to Web Help Desk using iptables (Linux)
# Allow only specific trusted networks to access Web Help Desk ports
iptables -A INPUT -p tcp --dport 8080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP
iptables -A INPUT -p tcp --dport 8443 -j DROP