Interview with Pentester Cyberjagu

In-depth cybersecurity interview covering penetration testing, security architecture, attack surfaces, social engineering, and defensive challenges.

Modern cybersecurity is shaped by an ongoing battle between increasingly complex systems and the people attempting to secure them. While headlines often focus on breaches, exploits, and threat actors, far less attention is given to the underlying causes of real-world security failures.

In this interview, DarkDotWeb speaks with penetration tester Cyberjagu about the realities of offensive security, common misconceptions about cybersecurity, and the challenges organizations face when trying to protect modern infrastructure. Topics include attack surfaces, human error, security maturity, and the growing complexity of digital systems.

The discussion focuses on high-level insights and professional experience rather than operational or sensitive technical details.

Background & Scope

Can you describe the type of penetration testing work you specialize in (e.g., web apps, infrastructure, red teaming)?

• I don’t have a specific penetration testing specialty. it would be incorrect to say I specialize in a specific penetration testing. I consider myself to be intermediate overall, but over the years I’ve explored various domains while consistently improving my skills, due to OPSEC considerations I can’t disclose everything but there are several ones where I’ve put good amount of time and effort web & AD are one of them.

  Jack of all trades, master of none, but sometimes better than a master of one.

What does a typical engagement look like from your perspective?

• Typical pentest engagement for onion sites is quite different from clearnet web applications there are almost no rules when conducting assessments aside from some common sense, like nuking the database or leaking plaintext IP & DDOS almost all assessments are based on blackbox testing if it’s a market I get test vendor account. generally I break it down into three phases

  1. Scope calculation I start by calculating the web app’s scope how many functionalities exist on the market, how many endpoints are accessible, which endpoints accept user inputs, and what types of input they take.

  2. Enumeration this is the most important step in any audit for example, checking directories, inputs, clearnet leaks, or other surface level vulnerabilities application behaviour on specific cases etc.

  3. Assessment & exploitation here I test for sqli,auth bypass, IDOR,LFI, RFI, logic flaws, file uploads, PGP functionality, race conditions, exposed panels and other kind of vulnerabilities on the enumerated endpoints I pay close attention to information disclosures that could lead to deanonymization like headers or versioning identifiers.

  Sometimes, I find a lot of issues in a single service/market sometimes, it takes days or weeks. on other occasions I audit a service I’ve previously assessed months ago and discover new vulnerabilities I missed before it’s purely dependent on luck or maybe my mood and the admin’s hardening efforts

How has the scope of pen-testing changed in recent years?

• Scope has definitely expanded a lot over the last decade. I remember the days when irl organization used to audit annually and now continuous testing is the norm on the most organization they don’t wait for the next schedule ,new vulnerabilities and 0 day  appear daily making it important for everyone to stay updated doing regular audits, patching things up. back in the days they used to focused on internal/external DMZ zones, firewalls, and such basic things including web applications.

  But now there are cloud environments, Iot devices, AI/ML systems the attack surface has also grown due to cloud migration and now pentesting has become far more effective when software is in development cycle, it’s no longer just a checkbox it’s ongoing capability that must adapt with evolving tech and threats and because of this the bar for pentesters has become very high.

Real-World Vulnerabilities

In your experience, are most vulnerabilities caused by misconfigurations, design flaws, or implementation errors?

• It’s hard to say because every hunter encounter all three types of vulnerabilities over time , what I’ve seen is that misconfigurations occur at firewall rules sometimes during deployment like running dev mode accidentally, exposing sensitive application files or database credentials, open vulnerable service, NULL authentication, using service’s default credentials etc such issues are so common.

  On the other hand, design flaws happen from developer decisions for example, front-end components with excessive rendering causing internal DoS or incorrect data type usage that leads to vulnerabilities these are more about how systems are structured upfront rather than implementation.

  Implementation errors they’re harder to pin down because the final product can differ significantly from what a developer intended some admins vibe-code with AI tools, which can create gaps in security that only get discovered during production audits.

  Long story short all three factors contribute to vulnerabilities, misconfigurations are frequent and easy to spot, design flaws require deeper analysis, and implementation errors often come down to context or oversight during development.

Are there certain vulnerability classes that appear consistently across different organizations/service ?

• No, I never witnessed a single vulnerability or bug that consistently appeared across different markets and services every developer creates different product some are really solid, some aren’t. Some code is easy to fix others might take hours, there were rare instances one of it was the negative value bug showed up across four different markets and on dread. Once it got exposed in a public post, everyone patched it almost immediately from then on. Hunters like me don’t see it as often because the game gets harder and harder every time we share findings.

  That’s what keeps it motivating, every expose post might minimize short term earnings or make the hunt feel tougher, but it also pushes us to dig deeper, find new angles, and stay one step ahead it’s part of the grind.

Do you find that known vulnerabilities (rather than zero-days) are still the primary issue?

• I don’t think so, but it’s fun to use them in lab environments, these kinds of vulnerabilities are extremely rare something like CVE-2017-0144 (eternalblue exploit) or shellshock are classic that shows up in labs or historical analyses but doesn’t pop up in modern systems anymore due to patches and hardening.

  When it comes to privesc, I do see certain vulnerabilities or kernel exploits in specific contexts those are a whole different topic entirely. They’re not generic bugs but more about deep layer weaknesses in operating systems or frameworks that are harder to patch or even identify.

Security Maturity

What separates organizations/markets with strong security posture from those that are easily compromised?

• The first thing is abuse prevention should have been built in from the very beginning, not retrofitted after launch. It’s now common to see vibe coded markets everywhere where developers think they can slap a prompt into something like Claude and expect it to generate a full fledged marketplace overnight. But they often forget that by doing this repeatedly, they ignore critical basics example rate limiting, input filters, and the fact that running raw queries in the back-end with almost no sanitization is a major red flag.

  Some markets actually test their code thoroughly from the start and implement security mechanisms as part of their foundational this is the right way to build something secure launching a marketplace, developers often spend months or even years refining every corner of the market before it goes live.

  Beyond the technical side, there’s also the human factor that needs attention. It’s imperative for admins to maintain a stable mindset, act responsibly, or at least project an image of competence. Users need to feel confident that their data and funds are safe and that the market isn’t just a chaotic experiment that will exist in a month or two. DDOS attacks are part of the reality too, once a market gain traction, opps & malicious actors will target it for fun or profit. Admins must be prepared to mitigate these threats quickly and effectively. It’s not just about technical skill it’s about staying proactive and adapting as the landscape evolves.

Tools vs Methodology

Do you think there is too much reliance on automated tools in security?

• No, uhm maybe for surface level scanning, I never found anything truly impactful using them. They might be useful in large scale assessments where the scope is big and time constraints make manual testing impractical. However I believe automated tools are not that helpful for bug hunting. A hunter needs to think outside the box targeting parameters where others might overlook. Experimenting with edge cases, or find areas and scenarios that no one else has tested. This kind of creativity is something tools struggle to replicate

  But automated tools work good in predictable environments where vulnerabilities follow known patterns they can’t intuit the context of a function’s purpose. How an error log might be displayed, or what input format & terminator character would work on system. For example, bypassing invalid character restrictions or crafting payloads that trigger unexpected behavior requires human intuition and experience things like understanding how a system handles malformed inputs or interpreting obfuscated responses. These are the moments where manual testing shines.

  AI tools could theoretically replicate these scenarios, but it would lack the ability to adapt in real time. Humans can shift strategies mid test based on new information, that’s why, the most critical vulnerabilities are often uncovered through manual exploration by poking at the edges.

Authentication & Access Control

Are authentication and access control still among the weakest points in systems?

• Yes they are still weak points in systems, though the landscape has shifted , authentication flaws have become relatively rarer in mature applications however, they still exist through session management issues, token misconfigurations, and legacy systems that don’t support modern auth not to forget it continues to hold the #1 position in OWASP Top 10 , access control issues are more common IDORs, missing server side authorization checks, and overly permissive endpoints are extremely common.

Offensive vs Defensive Gap

Do attackers generally have the advantage over defenders? Are organizations getting better at detecting attacks, or just responding after the fact?

• Attacker only need to find one weakness to succeed, while defenders have to protect everything this gives attackers a natural edge. They can choose the time, method, target and they only need to be right once. And irl defenders are getting better at detection tools like EDR, XDR and SIEMs with behavioral analytics have improved detection speed a lot both offense and defense are equally important.

  But I believe the defensive side carries more responsibility and it’s more critical, it’s a much harder continuous job. If defense is done properly, many attacks can be stopped before they even start. That’s why I respect defensive security a lot. It’s the foundation everything else depends on.

Security Mindset

What mindset separates a good security professional from the rest?

• Uhm intresting, maybe curiosity mixed with healthy paranoia? The best guys I’ve seen don’t just run tools, they dig deep, question every assumption, and actually try to understand how the system works under the hood instead of just following some checklist. They stay up auditing source code, replaying attacks, and thinking what if I twist this just a little differently.

What fundamental principle of security do you think is most often ignored?

• In defense, everyone loves putting up one strong wall and calling it a day. Very few actually build multiple layers that actually work when the first one fails in real attacks. Once an attacker gains initial access or finds one weak access control spot, everything inside usually falls apart because there’s no proper hardening or secondary checks.

  Most of them still don’t take least privilege seriously. They focus on stopping attackers from getting in, but forget to limit what they can do once they’re already inside but that’s changing now in current times, auditors are given scenarios where the network is already compromised from an internal point then they have to perform privilege escalation or move laterally to gain the highest possible privilege and maximum impact from there.

Future Outlook

Do you think the overall state of cybersecurity is improving or declining?

• It’s definitely improving. There’s no doubt, it will keep getting better over time. Improvement isn’t just about reacting faster it’s about rethinking how we approach security entirely. As threats evolve so do our tools and strategies. AI driven threat detection, zero-trust architectures, and automated response systems are now mainstream.

Personal Perspective

Has working in offensive security changed how you personally use technology?

• When it comes to my personal setup like, I compartmentalize everything obsessively, checking every application, and never click a link without thinking 10 times first. I assume any device or system I use can and probably will get compromised at some point, so I keep sensitive stuff off it as much as possible. There’s a lot more to add (like, way more), but I’m not going to share all the details because OPSEC is a real thing.

If you’re reading this and curious about how to go full paranoid mode? Check /d/opsec on dread it has got your back.

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Cyberjagu’s PGP key and verified contact details can be found here below.

Cyberjagu PGP Signed Contact Detail

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Cyberjagu PGP Key

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