Individual skill
web-cookie-audit
Cookie-conditional sink discovery — bisect required cookies per sink, session-write timeline for race-condition challenges.
packages/decepticon/decepticon/skills/standard/recon/web-recon/cookie-audit/SKILL.md
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- Last checked
- Nov 8, 2026
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- Nov 7, 2026
- License
- Apache-2.0
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- pentest Repository topic
- cookie-audit,-session-mutation,-gating Declared skill tag
- security Derived category
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# Cookie-Conditional Sink Discovery
A "sink" (eval, deserialize, exec, template render) may behave differently — or not fire at all — depending on which session cookies are present. Recon MUST enumerate every cookie the app sets and re-test each candidate sink with and without each cookie before declaring the sink unreachable. Skipping this step is the most common cause of exploit handing back a false "blind sink" verdict.
## Procedure
1. Walk the app unauthenticated; record every `Set-Cookie` (name, attributes, source endpoint).
2. Authenticate (every auth tier: anon, low-priv user, high-priv user) and record the full cookie jar after each.
3. For each candidate sink (parameter, route, header, body field):
- Probe with NO cookies.
- Probe with FULL authenticated jar.
- Bisect: drop one cookie at a time and re-probe. The cookie whose removal silences the sink is the gating cookie.
4. Document a "Sink preconditions" table in `recon_notes.md` and `SUMMARY.md`: