HackTheBox - DevArea
Source: YouTube · IppSec · published Jul 4, 2026 · 57:53
This HackTheBox machine requires careful reconnaissance to avoid two major time-wasting pitfalls: searching for custom vulnerabilities in a decompiled JAR file instead of checking library CVEs, and trying to escalate directly to root via a sudo script without first pivoting to a necessary second user 0:00-0:43.
Key Takeaways:
• Anonymous FTP provides a JAR file which, when decompiled, reveals an outdated Apache CXF library vulnerable to XXE, allowing arbitrary file reads 1:09-1:179:00-9:1920:29-20:37.
• Java's unique file handling allows listing /proc directories directly, revealing hardcoded Hoverfly admin credentials without needing to brute-force process IDs 25:46-26:1627:29-27:38.
• Hoverfly is exploited via an authenticated command injection vulnerability to gain an initial shell as devryan 28:18-28:5530:29-32:24.
• A Flask web app (SysWatch) running locally is accessed by forging a session cookie using a secret key found on the system, leading to command injection as the syswatch user 37:49-38:0339:52-40:1042:06-43:01.
• Root is achieved through a symlink chain bypass in the syswatch sudo script, tricking its weak symlink validation into reading /etc/shadow and root's SSH private key 52:04-52:3054:00-54:4956:43-56:50.
The box effectively demonstrates the importance of enumerating running processes, analyzing sudo script logic, and chaining multiple privilege escalation steps rather than rushing for immediate root access.
Sources:
- 0:00-0:43 Overview of the two main pitfalls on this machine
- 9:00-9:19 Identifying vulnerable Apache CXF version via Snyk
- 25:46-26:16 Using Java's directory read behavior to find Hoverfly credentials
- 38:49-40:10 Forging a Flask session cookie to bypass SysWatch login
- 42:06-43:01 Command injection via pipe character in SysWatch service check
- 52:04-54:49 Bypassing symlink checks with a chained symlink to read root files
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Transcript Preview
First 800 characters of the transcript
What's going on YouTube? This is Ippsec, and today we'll be doing DevArea from Hack The Box, which is a box you need really good recon for because there's two pits you can easily fall into and waste a lot of time. It starts off with analyzing a jar file, which sounds simple enough because you can decompile it to get the source code, but because you have source code, it's easy to dig into it looking for some type of custom vulnerability, but it's a CVE within the libraries this application uses. Once you get a shell, you can see it's possible to run a script with sudo. So, it's very easy to just go play with all the functions trying to get root directly. However, if you don't take a step back and look at what's running on the box, you'll miss a second user you can pivot to, and this user is…