CTX-07　Inline base64-decode exec

block 0 hits here sandbox-verified

① What it stops

Inline base64-decode-then-exec/eval in a shell command (classic obfuscated payload carrier)

Decode and inspect the payload first; never let inline decoded code run directly.

② Criteria

Item	Value
Severity	critical
Category	injection
Gate	Gate 1 content safety
Criterion type	tool_call
Applies to	Bash

Content patterns

\bexec\s*\(\s*(?:__import__\(['\"]base64['\"]\)\.)?base64\.b64decode\(
\beval\s*\(\s*(?:__import__\(['\"]base64['\"]\)\.)?base64\.b64decode\(
(?:exec|eval)\s*\([^;\n]{0,120}b64decode\s*\(

Generated directly from rules/default.json — never hand-written or paraphrased.

③ Real hits

Zero hits in the 14-day ledger on this machine — we do not post a sample. Zero hits means this machine never hit it, not that the rule is dead; effectiveness is covered by the sandbox trigger above.

④ False positives & exemptions

Built-in exclude patterns are listed under ②. Four exemption mechanisms exist globally (declared workspace roots, policy path whitelist, path-suspect alert-only, exclude patterns); counts on this machine are published on the Chinese page and in Limits.

⑤ Boundaries

Boundary
Criterion type	tool_call
Applies to	-
Platform	all platforms
Case sensitivity	Measured: insensitive (`RM -RF` is blocked like `rm -rf`)
Path normalisation	Measured: effective (`./sub/../.env` is blocked)
Scripts not parsed	An absolute path outside the project mentioned in a Bash command is alerted, not blocked — `scripts are not parsed (THREAT_MODEL Non-goals)`
Failure posture	fail-open; best-effort, not a hard security boundary

⑥ Reproduce

grep -h "CTX-07" .psl/audit/*.jsonl | head python challenge/generate_challenge.py python challenge/verify.py

Cite this page

Antinel AgentState. CTX-07 Inline base64-decode exec — rule detail. https://antinel.com/en/agentstate/rules/CTX-07/ (accessed YYYY-MM-DD)

Antinel. (2026). CTX-07 Inline base64-decode exec — rule detail. AgentState. https://antinel.com/en/agentstate/rules/CTX-07/

BibTeX

@misc{antinel_en_agentstate_rules_CTX_07,
  title        = {CTX-07 Inline base64-decode exec — rule detail},
  author       = {{Antinel}},
  year         = {2026},
  url          = {https://antinel.com/en/agentstate/rules/CTX-07/},
  note         = {claim tier: measured}
}

Claim tier: measured　采集时刻：2026-09-24T19:00:36+08:00