Oliver Rivas

Oliver Rivas is a security engineer focused on cloud and platform security: DevSecOps, Kubernetes hardening, AWS IAM, AI security, and OSINT, with 20+ years across operations, infrastructure, and security engineering. Find him on GitHub and LinkedIn.

RivasSec

Infrastructure. Security. Insight.

Field notes on infrastructure security, cloud hardening, Kubernetes, IAM, and OSINT by RivasSec.

Latest posts

When Telemetry Turns Predatory: A DevSecOps Look at Digital Repression in Venezuela

Every SOC pipeline has a shadow version. Using Venezuela as a grounded case study: how the primitives security engineers build become surveillance systems.


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Testing an IAM Analyzer Against Its Own Claims

I checked my IAM blast-radius analyzer against a catalog I did not write and a harness that attacks its own tests. Twice, a green build hid a wrong answer.


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The DevSecOps Guide: Hardening, IAM, and Incident Response

A hub for the DevSecOps writing on rivassec.com: IAM blast radius, TLS, incident response, and controls that hold up in production.


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When the Output Carries the Signal: Claude, SynthID-Text, and the New Detection Attack Surface

Claude's planned text watermark is embedded through token selection rather than hidden characters. Once enterprises automate on its detector, that provenance feature becomes a security control plane with spoofing, evasion, oracle, key-management, supply-chain, and policy-abuse requirements.


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IAM Blast Radius Is an Architecture Problem, Not a Policy Problem

Most IAM reviews start too late, after the account structure and trust boundaries are set. Least privilege isn't fewer actions; it's smaller failure domains.


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The Discovery Layer Is Broken: Hiring as an Observability Problem

The senior engineering market has a routing failure, not a talent shortage: resumes and funnels index for keywords and discard the signal seniors depend on.


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Prompt Injection Will Become a Supply Chain Evasion Technique

Prompt injection's threat model is older than the term. The mechanism is new, the objective is the evasion goal attackers have pursued for decades.


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Bandit-Clean Pwnagotchi Plugins: How `subprocess` Goes From Risk to Routine

Hardening a Pwnagotchi plugin against Bandit B602/B603/B607: shutil.which() full paths, argv-list calls, input validation, and the nosec discipline.


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TLS Has Three Jobs. Forget the Rest.

TLS gets easier when you stop walking the handshake and name what it's for. It does three jobs; anchor those and it becomes design, not memorization.


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Adoption Is a Security Control: Notes from Paving a Road

A control developers route around isn't a control. Field notes on making the secure path the easy path: 40% less remediation time, 27% less pipeline latency.


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The Teensy That Failed in Public: An EFI Brute Force, Hours Late

In 2013 Hackaday called my MacBook EFI brute force a failure; hours later it worked. Three rate-limiting defenses, each leaking at a different seam.


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IAM Roles That Fail Loud: Small Defaults, Big Difference

A small Pulumi library that treats IAM safety as a precondition: mandatory permissions boundary, no wildcard trust, no wildcard actions, every opt-out explicit.


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The Trust Decay: Why Modern Hiring Has Become an Adversarial System

The tech hiring pipeline has shifted from talent discovery to risk mitigation. In 2026, the engineers who get hired are the ones who are hardest to doubt.


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Never Lose Connection: Multi-Phone Bluetooth Tethering for Pwnagotchi

bt-tether-multi is a Pwnagotchi plugin for intelligent multi-phone Bluetooth tethering with automatic WAN failover and silent-disconnect recovery in the field.


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Elasticsearch Snapshot Verification, Minimal Privileges

Verify Elasticsearch snapshots without manage_snapshot: minimal API key, Prometheus-friendly script, and a public tools repo for hardened monitoring automation.


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Hardening Kubernetes Deployments

Pod-level Kubernetes guardrails aligned with the Pod Security Standards Restricted profile: non-root, no caps, read-only FS, NetworkPolicies, SA hardening.


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Taming the OOM Killer: Process Priorities on Linux

The Linux OOM Killer decides what dies under memory pressure. Protect sshd, mysqld, and other critical processes with oom_score_adj via a small script.


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Catching a Nation-State Proxy: OSINT on Twitter

In 2012 I traced a state-aligned Twitter proxy tied to Venezuela's ruling party. OSINT lessons for spotting subtle, credential-phishing nation-state infra.


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The 208.5-Day Kernel Bug: Uptime, Overflow, and Risk

A 2012 Linux kernel bug caused CPU lockups after 208.5 days of uptime due to an integer overflow in sched_clock(). RHEL 5/6 lesson: patch and observe uptime.


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The 2012 Leap Second: When Time Broke Java and the Cloud

The 2012 leap second broke Reddit, Yelp, Java apps, and more. A retrospective on how fragile timekeeping bit the cloud, and what SRE teams should do today.


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