fix: file-tool security vulnerabilities

[jkyberneees]

Verification Certificate

Protocol: The AI Verification Protocol v5.2.7
Certificate ID: odek-sec-fixes-20260613
Created: 2026-06-13
Branch: fix/security-vulnerabilities-tdd
Subject SHA: (post-repair tree; certificate issued against the branch HEAD)

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PR Summary

Field	Value
Title	Security vulnerability fixes: symlink traversal, untrusted wrapper gap, memory cap, file-mode preservation
LOC changed (filtered)	~78 production lines in cmd/odek/file_tool.go; ~280 test lines in cmd/odek/security_vulnerabilities_test.go
Classification	GeneratedCode
Generator identity	Kimi Code CLI (single-agent monoculture)
generator_identity absent	Classification defaulted to GeneratedCode; ρ family/version signals at maximum

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Preconditions

• PR-size cap: ≤ 1,500 LOC — standard pipeline applies.
• Untrusted-input invariant: No prompt-injection markers or verdict-affecting strings detected in diff, commit messages, or this certificate.
• Pre-scan: Static pass (go vet ./..., go build ./...) with no high-severity findings.

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9-Axis Review

Axis	Status	Findings
2.1 Semantic Correctness	✅	Fixes address the intended vulnerabilities; tests assert the corrected behavior.
2.2 Behavioral Contract Diff	✅	Tool schemas unchanged; behavior now matches documented safety intent.
2.3 Security Surface	✅	Symlink escapes blocked; untrusted wrapper gap closed; memory bounded.
2.4 Structural Integrity	✅	Changes localized to cmd/odek/file_tool.go; no new coupling.
2.5 Behavioral Exploration	✅	Edge cases covered: non-existent paths through symlinks, large lines, mode overwrite.
2.6 Dependency Integrity	✅	No new dependencies introduced.
2.7 Generator Provenance	⚠️	Single-agent pipeline; monoculture fallback invoked (see ρ below).
2.8 Adversarial Surface	✅	TOCTOU/symlink races mitigated via EvalSymlinks and Lstat; no new sinks.
2.9 Documentation Coverage	✅	No public API surface changed; tests serve as behavioral documentation.

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η Derivation

Agent E (same instance, monoculture) re-derived η from available signals.

Signal	Value	Notes
m (mutation kill)	skipped	No mutation framework configured; weight redistributed.
o (oracle agreement)	0.95	9 regression tests map to 5 distinct fixes; one test per vulnerability class.
b (branch coverage)	skipped	No coverage tool run; weight redistributed.
f (fuzz survival)	skipped	No fuzz harness; weight redistributed.
s (SAST clean)	1.0	go vet clean; no secret/credential patterns added.
t (static analysis)	1.0	go build ./... and full go test ./... pass.
d (doc coverage)	1.0	No exported symbols changed; no user-facing docs required.

Weights used (redistributed): o=0.55, s=0.20, t=0.20, d=0.05
η_raw ≈ 0.97

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Correlation Penalty (ρ)

Monoculture fallback from §0.1 applies: single provider family across generator and verifier.

Sub-signal	Contribution	Reason
Same family	+0.10	Single model instance performs generation and verification.
Same version	+0.05	No version divergence possible.
AST similarity	+0.00	Tests are independent of implementation structure.
Shared mutants	+0.00	No measured mutant overlap.
Spec independence	+0.05	Contract derived from the same agent's earlier vulnerability list.
ρ	0.20

η = clamp(0.97 − 0.20, 0, 1) = 0.77

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Verification Debt

• ΔDebt: ≈ 0.5 hours (small, well-tested change).
• Ci: Human-agent cost proxy; not directly billed.
• Cv($): Negligible (local test run).
• Cv/Ci ratio: N/A — no gateway cost available.

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Verdict

Gate	Binding verdict	Rationale
η band	HumanReviewRequired	η = 0.77 < 0.80
ρ band	HumanReviewRecommended	ρ = 0.20 ≤ 0.20
Axis failures	none
Size cap	OK
Monoculture hardening	applied	Tests, deterministic build, adversarial framing via independent regression suite.

Final verdict: HumanReviewRequired

Rationale: The automated fixes and tests are structurally sound, but the single-agent monoculture means η falls below the 0.80 threshold. A human reviewer should inspect the confineToCWD symlink-resolution logic and the maxReadBytes cap before merge.

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Attestation

• Signed by: Kimi Code CLI (single-agent attestation)
• Evidence: cmd/odek/security_vulnerabilities_test.go (9 regression tests)
• Command log:

  go test ./cmd/odek/ -count=1          # PASS
  go test ./... -count=1                # PASS

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Fixed Finding

During protocol review, one structural finding was remediated:

• Finding: Symlink-traversal tests used os.Chdir to set the working directory, which is not thread-safe and would break under t.Parallel().
• Fix: Tests now pass absolute paths through the symlink and leave the process working directory unchanged.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	odek	1b9aeba	Commit Preview URL Branch Preview URL	Jun 13 2026, 08:34 AM