CVE-2024-45085: IBM WebSphere Application Server DoS Flaw

CVE-2024-45085 Overview

CVE-2024-45085 is a denial-of-service vulnerability affecting IBM WebSphere Application Server 8.5. Under certain configurations, the server fails to handle a specially crafted request, allowing a remote unauthenticated attacker to trigger an error condition that disrupts service availability. The flaw is categorized under CWE-754: Improper Check for Unusual or Exceptional Conditions.

The vulnerability is network-exploitable, requires no privileges, and no user interaction. It impacts availability only, with no confidentiality or integrity impact. IBM published an advisory and remediation guidance through the IBM Support Page Advisory.

Critical Impact
A remote unauthenticated attacker can send a crafted request to a vulnerable WebSphere Application Server 8.5 instance and induce a denial-of-service condition, disrupting business-critical Java EE applications.

Affected Products

IBM WebSphere Application Server 8.5 (Traditional)
Java EE applications hosted on affected WebSphere instances
Deployments using vulnerable configurations as defined in the IBM advisory

Discovery Timeline

2024-10-15 - CVE-2024-45085 published to the National Vulnerability Database
2024-11-08 - Last updated in NVD database

Technical Details for CVE-2024-45085

Vulnerability Analysis

The vulnerability resides in how IBM WebSphere Application Server 8.5 processes inbound requests under specific configurations. When the server receives a malformed or unexpected request structure, it fails to validate or gracefully handle the exceptional condition. This triggers an internal error that exhausts a critical resource or aborts a request-handling thread, resulting in denial of service.

Denial-of-service availability impact on a Java EE application server can cascade across dependent workloads. WebSphere typically fronts enterprise applications, message queues, and integration tiers, so an outage in this layer can interrupt downstream business processes.

Root Cause

The root cause maps to CWE-754: Improper Check for Unusual or Exceptional Conditions. The application server does not adequately verify whether an inbound request meets expected structural or protocol assumptions before processing it. When the unexpected condition occurs, the resulting unhandled error propagates and disrupts service.

IBM has not publicly disclosed the specific vulnerable code path or the exact request structure that triggers the condition. The advisory states that the issue manifests only under certain configurations, indicating that exposure depends on deployment-specific settings.

Attack Vector

The attack vector is network-based and requires no authentication. An attacker reachable to the WebSphere listener port sends a specially crafted request to the vulnerable endpoint. No user interaction is required, and the attack complexity is low.

Exploitation does not require prior access or credentials, making any internet-exposed WebSphere 8.5 instance a potential target. As of publication, no public proof-of-concept exploit has been observed, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detailed reproduction steps are not publicly available. Refer to the IBM Support Page Advisory for IBM's confidential technical guidance to licensed customers.

Detection Methods for CVE-2024-45085

Indicators of Compromise

Unexpected SystemOut.log or SystemErr.log entries showing unhandled exceptions tied to request processing threads
Sudden spikes in HTTP 500 responses or abrupt termination of WebSphere worker threads
Repeated malformed requests from the same source IP targeting WebSphere listener ports
Application server restarts or thread pool exhaustion without a corresponding workload increase

Detection Strategies

Monitor WebSphere JVM logs for recurring exception stack traces correlating with inbound request anomalies
Deploy web application firewall rules to flag malformed HTTP requests directed at WebSphere endpoints
Inspect network traffic for protocol-level anomalies on ports serving the WebSphere Traditional profile

Monitoring Recommendations

Enable verbose request logging in WebSphere to capture request headers and payloads preceding crashes
Track JVM heap, thread pool utilization, and request queue depth for early warning of resource exhaustion
Forward WebSphere and reverse-proxy logs to a centralized SIEM for correlation with network telemetry

How to Mitigate CVE-2024-45085

Immediate Actions Required

Apply the fix referenced in the IBM Support Page Advisory according to your WebSphere 8.5 fix pack level
Inventory all IBM WebSphere Application Server 8.5 instances, including internal and DMZ-facing deployments
Restrict network exposure of WebSphere listener ports to trusted networks and reverse proxies only
Validate that web application firewall and load balancer rules drop malformed requests before they reach the application server

Patch Information

IBM has published remediation through interim fixes and fix pack updates for WebSphere Application Server 8.5. Customers should consult the IBM Support Page Advisory for the specific interim fix identifier applicable to their installed fix pack level, then apply it using the IBM Installation Manager. Restart the affected JVM after applying the fix to ensure the updated code path is loaded.

Workarounds

Place a hardened reverse proxy or web application firewall in front of WebSphere to filter malformed requests
Review WebSphere configuration against the conditions described in the IBM advisory and disable non-essential listeners
Configure automatic JVM restart policies in WebSphere Network Deployment to reduce recovery time after a service disruption

bash

# Example: restrict WebSphere listener exposure with iptables
iptables -A INPUT -p tcp --dport 9080 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 9080 -j DROP
iptables -A INPUT -p tcp --dport 9443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 9443 -j DROP