Comprehensive Technical Analysis of EUVD-2026-4765 (CVE-2026-24816)

Infinite Loop Vulnerability in datavane TIS (ChangeDomainAction.java)

1. Vulnerability Assessment & Severity Evaluation

Vulnerability Overview

EUVD-2026-4765 (CVE-2026-24816) describes an Infinite Loop vulnerability in datavane TIS (Total Information System), specifically within the ChangeDomainAction.java file in the tis-console module. The flaw arises from a loop with an unreachable exit condition, meaning the affected code segment may execute indefinitely under certain input conditions.

CVSS v4.0 Severity Analysis

The vulnerability has been assigned a CVSS v4.0 Base Score of 10.0 (Critical), with the following vector:

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:P/AU:Y/R:U/V:C/RE:M/U:Red

Key Metrics Breakdown:

Metric	Value	Interpretation
Attack Vector (AV)	Network (N)	Exploitable remotely over a network.
Attack Complexity (AC)	Low (L)	No specialized conditions required.
Attack Requirements (AT)	None (N)	No user interaction or prior access needed.
Privileges Required (PR)	None (N)	No authentication required.
User Interaction (UI)	None (N)	Exploitable without user action.
Vulnerable System Confidentiality (VC)	High (H)	Full disclosure of sensitive data possible.
Vulnerable System Integrity (VI)	High (H)	Complete compromise of data integrity.
Vulnerable System Availability (VA)	Low (L)	Limited impact on availability (DoS possible but not guaranteed).
Subsequent System Confidentiality (SC)	High (H)	Lateral movement or further data exfiltration possible.
Subsequent System Integrity (SI)	High (H)	Attacker can modify data in connected systems.
Subsequent System Availability (SA)	Low (L)	Limited secondary availability impact.
Safety (S)	Present (P)	May affect safety-critical systems if TIS is used in industrial/healthcare environments.
Automatable (AU)	Yes (Y)	Exploit can be automated.
Recovery (R)	Unrecoverable (U)	Requires manual intervention to restore service.
Value Density (V)	Concentrated (C)	High-value target (e.g., enterprise data systems).
Response Effort (RE)	Medium (M)	Requires patching and potential forensic analysis.
Exploit Maturity (U)	Red (Red)	Exploit code likely exists or is easily developable.

Severity Justification

• Critical (10.0) due to:
  • Remote exploitation without authentication.
  • High impact on confidentiality and integrity (potential for data leakage or manipulation).
  • Automatable attacks increasing the risk of mass exploitation.
  • Safety implications if TIS is deployed in critical infrastructure.

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Scenarios

1. Denial-of-Service (DoS) Attack

   • An attacker crafts malicious input (e.g., API requests, form submissions) that triggers the infinite loop, consuming CPU/memory resources and causing service degradation or crash.
   • Example: A specially formatted HTTP request to the ChangeDomainAction endpoint with parameters that prevent loop termination.

2. Resource Exhaustion Leading to Secondary Exploits

   • If the loop consumes excessive system resources, it may starve other processes, enabling:
     • Privilege escalation (if the system becomes unresponsive and misconfigurations are introduced).
     • Lateral movement (if the affected service interacts with other systems).
     • Data exfiltration (if the loop is used to delay security controls while extracting data).

3. Bypassing Security Controls

   • If the infinite loop occurs in an authentication or authorization module, it may:
     • Prevent legitimate users from logging in (DoS).
     • Allow unauthorized access if the loop interferes with session validation.

Exploitation Requirements

• No authentication required (CVSS PR:N).
• No user interaction needed (CVSS UI:N).
• Low technical skill required (CVSS AC:L) – basic scripting knowledge suffices.
• Publicly accessible endpoints (if TIS is exposed to the internet).

Proof-of-Concept (PoC) Considerations

• A malicious HTTP request to the vulnerable endpoint with parameters that manipulate loop conditions.
• Example (hypothetical):

  POST /tis/changeDomain HTTP/1.1
  Host: vulnerable-tis.example.com
  Content-Type: application/json
  
  {
    "domain": "example.com",
    "config": {
      "loopTrigger": "malicious_value_that_prevents_exit"
    }
  }
  

• Automated exploitation via tools like Burp Suite, OWASP ZAP, or custom Python scripts.

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3. Affected Systems & Software Versions

Vulnerable Software

• Product: datavane TIS (Total Information System)
• Module: tis-console (src/main/java/com/qlangtech/tis/runtime/module/action/ChangeDomainAction.java)
• Affected Versions: All versions before v4.3.0
• Fixed Version: v4.3.0+

Deployment Context

• Enterprise data management systems (e.g., financial, healthcare, government).
• Cloud-based or on-premise deployments of TIS.
• Integrations with other enterprise systems (e.g., ERP, CRM, SIEM).

European Impact

• ENISA Product ID: 1ee0b41b-f0f0-30de-b8fc-dbb9f611b3c7
• ENISA Vendor ID: 597939be-5516-3102-9b75-3091f38f492f
• Potential exposure in EU organizations using TIS for data processing, compliance reporting, or critical infrastructure management.

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4. Recommended Mitigation Strategies

Immediate Actions

1. Apply the Official Patch

   • Upgrade to TIS v4.3.0 or later (GitHub PR: #444).
   • If patching is delayed, apply temporary workarounds (see below).

2. Temporary Workarounds (if patching is not feasible)

   • Input Validation & Sanitization
     • Implement strict input validation on all parameters passed to ChangeDomainAction.
     • Use whitelisting for expected values (e.g., domain names, configuration parameters).
   • Rate Limiting & Request Throttling
     • Deploy WAF (Web Application Firewall) rules to limit requests to vulnerable endpoints.
     • Use API gateways (e.g., Kong, Apigee) to enforce rate limits.
   • Process Isolation
     • Run the TIS console in a containerized environment (Docker, Kubernetes) with resource limits to prevent system-wide DoS.
   • Monitoring & Alerting
     • Deploy SIEM solutions (e.g., Splunk, ELK, Wazuh) to detect unusual CPU/memory spikes.
     • Set up automated alerts for prolonged high-resource usage.

3. Network-Level Protections

   • Restrict access to the TIS console via firewall rules (allow only trusted IPs).
   • Disable unnecessary endpoints if ChangeDomainAction is not critical.

Long-Term Mitigations

1. Secure Coding Practices
   • Static & Dynamic Analysis
     • Integrate SAST/DAST tools (e.g., SonarQube, Checkmarx, Burp Suite) into the CI/CD pipeline.
     • Use fuzz testing (e.g., AFL, LibFuzzer) to identify infinite loops.
   • Code Review & Loop Safeguards
     • Ensure all loops have explicit exit conditions and timeout mechanisms.
     • Implement circuit breakers to prevent indefinite execution.
2. Runtime Protection
   • Deploy RASP (Runtime Application Self-Protection) solutions to detect and terminate infinite loops.
3. Incident Response Planning
   • Develop a playbook for DoS attacks targeting TIS.
   • Ensure backup and recovery procedures are in place.

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5. Impact on the European Cybersecurity Landscape

Regulatory & Compliance Risks

• GDPR (General Data Protection Regulation)
  • If TIS processes personal data, an infinite loop leading to data exposure could result in GDPR violations (fines up to 4% of global revenue).
• NIS2 Directive (Network and Information Security)
  • Critical infrastructure operators using TIS may face NIS2 compliance issues if the vulnerability leads to service disruption.
• DORA (Digital Operational Resilience Act)
  • Financial institutions using TIS must ensure operational resilience; this vulnerability could disrupt financial services.

Sector-Specific Risks

Sector	Potential Impact
Healthcare	Disruption of patient data systems, delayed treatments.
Financial Services	Transaction processing failures, fraud risks.
Government	Compromise of sensitive administrative data.
Critical Infrastructure	Operational disruptions in energy, transport, or water management.

Threat Actor Interest

• Cybercriminals: May exploit for extortion (DoS-for-ransom) or data theft.
• State-Sponsored Actors: Could leverage the flaw for espionage or sabotage in critical sectors.
• Hacktivists: May target organizations using TIS for disruptive attacks.

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6. Technical Details for Security Professionals

Root Cause Analysis

• Vulnerable Code Path:

  // Example (hypothetical) vulnerable loop in ChangeDomainAction.java
  while (domainConfig.isValid()) {
      if (someCondition) {
          // Missing exit condition or incorrect logic
          continue;
      }
      // No break or return statement
  }
  

• Issue: The loop lacks a proper termination condition, allowing an attacker to manipulate domainConfig or someCondition to keep the loop running indefinitely.

Exploitation Flow

1. Attacker sends a crafted request to the ChangeDomainAction endpoint.
2. Malicious input prevents loop exit, causing CPU/memory exhaustion.
3. System becomes unresponsive, leading to:
   • DoS (if the loop blocks critical threads).
   • Data corruption (if the loop modifies shared resources).
   • Security control bypass (if the loop interferes with authentication).

Forensic Indicators

• Logs:
  • Repeated entries in tis-console logs for the same ChangeDomainAction request.
  • High CPU/memory usage in monitoring tools (e.g., Prometheus, Nagios).
• Network Traffic:
  • Unusually high request rates to /tis/changeDomain.
  • Suspicious parameter values in HTTP requests.

Detection & Hunting Queries

• SIEM Query (Splunk Example):

  index=tis_console sourcetype=access_log
  | search uri_path="/tis/changeDomain"
  | stats count by src_ip, http_method, status
  | where count > 100
  

• YARA Rule (for memory forensics):

  rule TIS_InfiniteLoop_Exploit {
      meta:
          description = "Detects potential infinite loop exploitation in datavane TIS"
          author = "Cybersecurity Analyst"
          reference = "CVE-2026-24816"
      strings:
          $loop_pattern = /while\s*\([^)]*\)\s*\{[^}]*continue[^}]*\}/ nocase
          $malicious_input = /"loopTrigger"\s*:\s*"[^"]*malicious[^"]*"/ nocase
      condition:
          $loop_pattern or $malicious_input
  }
  

Reverse Engineering & Patch Analysis

• GitHub PR #444 (Link) likely includes:
  • Addition of a loop timeout (e.g., maxIterations counter).
  • Input validation for domainConfig parameters.
  • Logging of suspicious loop conditions.
• Security professionals should:
  • Diff the patch to understand the exact fix.
  • Test the patch in a staging environment before production deployment.

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Conclusion & Recommendations

Key Takeaways

• EUVD-2026-4765 (CVE-2026-24816) is a Critical (CVSS 10.0) infinite loop vulnerability in datavane TIS with remote exploitation potential.
• Primary risks: DoS, data corruption, security control bypass.
• Affected versions: All TIS releases before v4.3.0.
• Mitigation: Immediate patching (v4.3.0+), input validation, rate limiting, and monitoring.

Action Plan for Organizations

1. Patch immediately (v4.3.0 or later).
2. Deploy temporary workarounds if patching is delayed.
3. Monitor for exploitation attempts (SIEM, WAF logs).
4. Review compliance implications (GDPR, NIS2, DORA).
5. Conduct a post-incident review if exploitation is suspected.

Further Research

• Exploit development (for red team assessments).
• Impact analysis on integrated systems (e.g., ERP, SIEM).
• Long-term secure coding training for TIS developers.

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Prepared by: [Your Name/Organization] Date: [Insert Date] Classification: TLP:AMBER (Limited distribution to trusted partners)