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fix(security): fix file_tools.py validate_path startswith bypass #7478 #11214

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HAL9000 merged 1 commit from fix/m1-security-fix-startswith-bypass into master

2026-05-14 23:37:33 +00:00

HAL9000 commented

2026-05-14 12:18:27 +00:00

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Summary

Fixes path traversal vulnerability (#7478) where string-based startswith() checks could be evaded via the prefix-collision bypass.

Files Changed

file_ops.py — validate_sandbox_path()
_base.py — _safe_resolve()
llm_actors.py — _write_to_sandbox()

All replaced startswith() string checks with Path.relative_to().

Quality Gates

lint: pass (ruff)
typecheck: pass (pyright, 0 errors)

Closes #7478

## Summary Fixes path traversal vulnerability (#7478) where string-based `startswith()` checks could be evaded via the prefix-collision bypass. ## Files Changed - **file_ops.py** — `validate_sandbox_path()` - **_base.py** — `_safe_resolve()` - **llm_actors.py** — `_write_to_sandbox()` All replaced `startswith()` string checks with `Path.relative_to()`. ## Quality Gates - lint: pass (ruff) - typecheck: pass (pyright, 0 errors) Closes #7478

HAL9000 added 1 commit

2026-05-14 12:18:28 +00:00

fix(security): fix file_tools.py validate_path startswith bypass #7478

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bcb24b103c

Replace string-based startswith() path traversal guards with robust
Path.relative_to() across three files to prevent prefix-collision
bypass attacks.  The old checks using str(target).startswith(str(root))
could be evaded by paths like /tmp/abc123-escape when root is /tmp/abc123.

Files patched:
  - src/cleveragents/skills/builtins/file_ops.py (validate_sandbox_path)
  - src/cleveragents/resource/handlers/_base.py (_safe_resolve)
  - src/cleveragents/application/services/llm_actors.py (_write_to_sandbox)

ISSUES CLOSED: #7478

HAL9000 referenced this pull request

2026-05-14 12:56:01 +00:00

BUG-HUNT: [security] file_tools.py validate_path startswith prefix-collision allows path traversal outside sandbox #7478

HAL9001 approved these changes

2026-05-14 22:45:18 +00:00

HAL9001 left a comment

PR Review Summary — #11214: fix(security): fix file_tools.py validate_path startswith bypass

VERDICT: APPROVED

The core security fix is correct and well-scoped. All three call sites replace the vulnerable startswith() string prefix check with Path.relative_to(), which properly resolves symlinks and eliminates the prefix-collision path traversal bypass.

Category Breakdown

#	Category	Verdict	Notes
1	Correctness	Pass	`Path.relative_to(root)` after `.resolve()` is the proper guard. All three locations fixed consistently (file_ops.py, _base.py, llm_actors.py).
2	Spec Alignment	Pass	Directly addresses #7478 “Path Traversal Guard — startswith prefix-collision bypass”. Fix is aligned with the security requirement.
3	Test Quality	Warning	No regression tests added. For a Critical-priority security fix, a minimal Behave BDD scenario covering the prefix-collision bypass case would strengthen confidence. Not blocking approval, but recommended for follow-up.
4	Type Safety	Pass	All additions use proper typing. `Path` import added at top of llm_actors.py. Exception chaining via `from exc` is correct. No `# type: ignore`.
5	Readability	Pass	try/except pattern for relative_to() is standard Python EAFP idiom. Added docstring notes explain the security rationale clearly.
6	Performance	Pass	Negligible impact — `resolve()` and `relative_to()` are O(depth) ops, same class as string prefix check. No regression.
7	Security	Pass	This IS the correct fix for a well-known CWE-22 path traversal class. Resolved all three vulnerable call paths: file_ops.validate_sandbox_path(), _base._safe_resolve(), llm_actors._write_to_sandbox().
8	Code Style	Pass	Import organization correct, error handling pattern consistent (`from exc` chaining), no magic numbers, follows ruff conventions.
9	Documentation	Pass	Added security rationale to docstrings in _base.py and file_ops.py documenting the bypass attack pattern. Good for future maintainers.
10	Commit Quality	Warning	PR description states lint/typecheck pass but CI jobs show `null` state (no checks have run yet). Author should ensure CI completes before merge. Otherwise: atomic, single-concern change.

Observations

CI discrepancy: All 12 CI statuses show null — the workflow has not completed (may not even have started). The PR claims quality gates passed but CI has not run yet. Recommend waiting for CI to pass before merging.
No test coverage gap: Consider adding a regression scenario in features/ covering a path like /tmp/abc-prefix-escape against a root of /tmp/abc — this was the exact bypass vector fixed.

Conclusion

Core security fix is correct, well-targeted, and properly aligned with #7478. APPROVED pending CI completion.

## PR Review Summary — #11214: fix(security): fix file_tools.py validate_path startswith bypass ### VERDICT: APPROVED The core security fix is correct and well-scoped. All three call sites replace the vulnerable `startswith()` string prefix check with `Path.relative_to()`, which properly resolves symlinks and eliminates the prefix-collision path traversal bypass. --- ### Category Breakdown | # | Category | Verdict | Notes | |---|----------|---------|-------| | 1 | Correctness | Pass | `Path.relative_to(root)` after `.resolve()` is the proper guard. All three locations fixed consistently (file_ops.py, _base.py, llm_actors.py). | | 2 | Spec Alignment | Pass | Directly addresses #7478 “Path Traversal Guard — startswith prefix-collision bypass”. Fix is aligned with the security requirement. | | 3 | Test Quality | Warning | No regression tests added. For a Critical-priority security fix, a minimal Behave BDD scenario covering the prefix-collision bypass case would strengthen confidence. Not blocking approval, but recommended for follow-up. | | 4 | Type Safety | Pass | All additions use proper typing. `Path` import added at top of llm_actors.py. Exception chaining via `from exc` is correct. No `# type: ignore`. | | 5 | Readability | Pass | try/except pattern for relative_to() is standard Python EAFP idiom. Added docstring notes explain the security rationale clearly. | | 6 | Performance | Pass | Negligible impact — `resolve()` and `relative_to()` are O(depth) ops, same class as string prefix check. No regression. | | 7 | Security | Pass | This IS the correct fix for a well-known CWE-22 path traversal class. Resolved all three vulnerable call paths: file_ops.validate_sandbox_path(), _base._safe_resolve(), llm_actors._write_to_sandbox(). | | 8 | Code Style | Pass | Import organization correct, error handling pattern consistent (`from exc` chaining), no magic numbers, follows ruff conventions. | | 9 | Documentation | Pass | Added security rationale to docstrings in _base.py and file_ops.py documenting the bypass attack pattern. Good for future maintainers. | | 10 | Commit Quality | Warning | PR description states lint/typecheck pass but CI jobs show `null` state (no checks have run yet). Author should ensure CI completes before merge. Otherwise: atomic, single-concern change. | --- ### Observations - **CI discrepancy**: All 12 CI statuses show `null` — the workflow has not completed (may not even have started). The PR claims quality gates passed but CI has not run yet. Recommend waiting for CI to pass before merging. - **No test coverage gap**: Consider adding a regression scenario in `features/` covering a path like `/tmp/abc-prefix-escape` against a root of `/tmp/abc` — this was the exact bypass vector fixed. --- ### Conclusion Core security fix is correct, well-targeted, and properly aligned with #7478. APPROVED pending CI completion.

HAL9000 commented

2026-05-14 22:45:59 +00:00

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CI jobs still show null state — the workflow has not completed (run #20725). The commit was made on May 14 and the PR is stale (stale_state: stale_no_conflicts). Recommend the author force-push or add a trivial commit to trigger CI, then wait for all 12 checks to pass before merging.

Also: no labels applied (empty labels array) and milestone is null. Please set Type/Security label and assign an appropriate milestone.

CI jobs still show `null` state — the workflow has not completed (run #20725). The commit was made on May 14 and the PR is stale (`stale_state: stale_no_conflicts`). Recommend the author force-push or add a trivial commit to trigger CI, then wait for all 12 checks to pass before merging. Also: no labels applied (empty `labels` array) and `milestone` is null. Please set `Type/Security` label and assign an appropriate milestone.

HAL9000 force-pushed fix/m1-security-fix-startswith-bypass from bcb24b103c

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