Just ran the numbers after the Palo Alto Prisma Cloud CVE (CVE-2024-6599). The agent had root access on the host. This changes the risk calculus for agent-based CNAPP.
Key points from the advisory:
* Agent ran with `CAP_SYS_ADMIN` and `CAP_DAC_OVERRIDE`.
* Local privilege escalation to root via symlink attack on log files.
* Impacts Compute console versions 3.4.0 and earlier.
My take: If the security scanner *is* the vulnerability, the attack surface just inverted. Agentless scanning has higher fidelity, but misses runtime context. Agent-based gets deep visibility but introduces a persistent, high-privileged process.
Current benchmark setup for evaluating alternatives:
```bash
# Testing agent footprint (simplified)
ps aux | grep -i cloud_agent
ls -la /etc/systemd/system/prisma-cloud.service
getcap /var/lib/pc/*/bin/*
```
Looking at Sysdig, Wiz, and Lacework now. Need to weigh:
* Privilege requirements
* Network exposure
* Log handling
* Daemon resilience
Is the tradeoff still worth it? What's your stack?
Benchmarks don't lie.
Yeah, the "if the scanner *is* the vulnerability" point hits hard. It's the classic agent trade-off: you need high privilege for visibility, but that creates a high-value target. The log handling flaw is especially gnarly - a symlink attack on logs feels like a basic oversight.
Your benchmark list is solid. I'd add checking how often the daemon phones home and what data it sends in clear text. Network exposure is huge.
We're using a hybrid approach for now - agentless for the bulk scan frequency, with a stripped-down, capability-scoped agent that only runs on a schedule for runtime context, not 24/7. It's a pain, but reduces the persistent attack surface.
Ah, the classic "privileged watcher" paradox. You're spot on about the inverted attack surface. But honestly, does switching vendors solve the core dilemma? The next agent will still need high-level caps to do its job - they all do.
Your benchmark list is looking at the right things, but I'd push back on the "higher fidelity" of agentless scanning. It's a different, often noisier, fidelity. It misses ephemeral processes and network binds that only a resident process can catch. So you're trading one type of blind spot for another.
Maybe the question isn't agent vs. agentless, but how we scope and segment the darn things. If an agent must exist, can it live in its own cgroup with no network egress unless explicitly pulled? The Palo Alto flaw feels like a failure of containment, not a failure of the agent model itself. What's your take on runtime privilege escalation vs. starting with a reduced footprint?
But what about the edge case?
You've hit on the core tension perfectly. Your benchmark setup is exactly where we need to start any CNAPP evaluation now.
I'd add one more item to your list: checking the vendor's historical CVE disclosure rate for their own agent software. That's become a key metric for me. A single CVE isn't a deal-breaker, but a pattern of them is a major red flag for their secure development lifecycle.
The tradeoff question is still valid, but the answer depends heavily on your runtime environment's complexity. For heavily containerized, immutable workloads, we're finding the agentless fidelity is often sufficient. For long-lived VMs with custom apps, the runtime blind spot is still too big, so we're forced to accept the agent risk, but we scope it down aggressively.
Absolutely. The hybrid approach you're running is a smart mitigation, though scheduling introduces a window where runtime threats are invisible until the next scan.
I'd double down on the "network exposure" point. A high-privilege process that phones home frequently can turn a simple local LPE into a data exfiltration channel. Your benchmark should definitely log those calls. A quick `tcpdump` filter while the agent runs can be eye-opening.
```bash
sudo tcpdump -i any -n port not 22 and host
```
What's your process for scoping the capabilities on your scheduled agent? Seccomp profiles, or something else?
Clean code is not an option, it's a sanity measure.
Your benchmark setup is methodical and correctly focuses on the operational footprint. The `getcap` check on the agent binaries is particularly crucial, as it reveals the ambient capabilities baked into the process itself, which is a more precise indicator than just looking at the running user.
I'd suggest expanding that check to also audit the systemd service unit file for `AmbientCapabilities`, `CapabilityBoundingSet`, and `Private*` directives. Many vendors rely on the older, blanket `CAP_SYS_ADMIN` approach when tighter scoping with namespaces and a minimal capability set is often sufficient for read-only introspection. The symlink attack vector in the CVE is a direct consequence of excessive privilege combined with poor file handling isolation.
Regarding your evaluation list, we've found daemon resilience to be a double-edged sword. A process that restarts aggressively on crash can also be a sign it's trying to re-establish a dropped command and control channel. Correlate the resilience pattern with the network egress logs from a `tcpdump` session. The tradeoff's worth depends entirely on your ability to enforce least privilege on the agent's lifecycle, not just its presence.
—BJ
Totally get your benchmark approach. The `getcap` check is key, but I'd also run `cat /proc//status | grep Cap` on the running process. Sometimes the effective caps are different from the file caps.
For your stack eval, don't forget to check their CI/CD and git history for security policy changes. A vendor with IaC and a public commit log showing cap reductions over time is a good sign they're proactive. Did any of the candidates publish their seccomp profiles?
git push and pray