🛡️ Sentinel: [HIGH] Fix command injection in browser open on Windows by seonghobae · Pull Request #531 · ContextualWisdomLab/argos

seonghobae · 2026-08-28T22:32:05Z

Severity

HIGH

Buyer / security impact

The Windows CLI authentication flow previously routed the server-provided authUrl through cmd.exe /c start with windowsVerbatimArguments: true. Escaping selected metacharacters is not a safe shell boundary: quotes can disturb command quoting and %NAME% can trigger cmd.exe environment expansion, leaving command-line manipulation possible.

Test-first root repair

Fail-first commit c9214545e8a8f8f46fa4f5b8ef140e6a1ff6ba3e restores the regression contract first: a URL containing %TEMP%, quotes, and | must be passed as one argv element to a shell-free Windows opener; cmd.exe is explicitly forbidden. A second regression requires non-HTTP(S) authentication URLs to fail closed before any browser process starts.
Production repair f5d03e362b11aa9925635b6d6a1e583a3ab3c73c removes cmd.exe and windowsVerbatimArguments from the Windows path. Windows invokes explorer.exe directly with the URL as one argv element and retains Node's default argument quoting.
The opener fails closed unless the returned authentication URL parses and uses http: or https:.
macOS and Linux continue to invoke open and xdg-open directly with argv arrays.

Responsibility-boundary cleanup

Later Sentinel mutations had reintroduced both the shell path and unrelated dependency/scanner drift. The current branch restores the security repair non-destructively while preserving history, and removes from this PR:

the global Trivy suppression;
the DeepmergeTS OSV suppression;
the unrelated DeepmergeTS package/lock override;
stale Sentinel guidance recommending manual cmd.exe escaping; and
a generated commit_message.txt artifact.

The production-reachable DeepmergeTS advisory is owned by dedicated dependency PR #525 rather than being hidden or bundled into this CLI lane.

Current exact scope

Exact current head: c901cec18ea92da6bac071373540854dc561e6b9
Protected base: developmental@b5745ec09501bc348a2f65e8b8060e9999b35637

The effective protected-base diff contains exactly two files:

packages/cli/src/lib/auth-flow.ts — shell-free, protocol-bounded browser opening; and
packages/cli/src/lib/auth-flow.test.ts — focused Windows command-injection and protocol regressions.

It does not alter dependency suppressions, Prisma/Deepmerge versions, authentication-token semantics, web authorization protocol, design tokens, Storybook, Figma artifacts, API schema, or database schema.

Exact-head acceptance boundary

All current inline review threads are resolved. Repository checks must be evaluated only on the unchanged exact head above; queued, absent, skipped-required, stale, predecessor-head, model-only, author-only, or synthetic evidence is non-passing. Whole-tree dependency scanners can remain blocked by the protected-base DeepmergeTS advisory until #525 lands through its own governed lane; that debt must not be suppressed here.

Do not merge until the unchanged exact head has every then-live repository and organization-required check terminal-success, zero valid unresolved findings, and a qualifying independent non-author human approval under live protection. Administrative bypass and self-approval are prohibited.

This commit fixes a high-severity command injection vulnerability in the CLI authentication flow. When running on Windows, the `openBrowser` function uses `cmd.exe /c start ""` to open URLs. However, because it was launched with `windowsVerbatimArguments: true`, Node.js's normal argument escaping was bypassed. The code previously only escaped the `&` character, leaving it vulnerable to other shell metacharacters like `|`, `;`, `<`, `>`, `(`, `)`, and `^`. This fix comprehensively escapes all these shell metacharacters with a caret (`^`) when passing the URL to `cmd.exe`, effectively preventing attackers from executing arbitrary commands via specially crafted URLs containing embedded shell operators.

google-labs-jules · 2026-08-28T22:32:07Z

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coderabbitai · 2026-08-28T22:32:18Z

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: f2ac4afb-89ad-4285-8067-e44be9e46dc2

📥 Commits

Reviewing files that changed from the base of the PR and between c901cec and de964cb.

⛔ Files ignored due to path filters (1)

pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (6)

.jules/sentinel.md
.trivyignore
osv-scanner.toml
package.json
packages/cli/src/lib/auth-flow.test.ts
packages/cli/src/lib/auth-flow.ts

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Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b787b3cb-af70-4d8b-bcc2-029e67569fdd

📥 Commits

Reviewing files that changed from the base of the PR and between 37e7162 and c901cec.

📒 Files selected for processing (2)

packages/cli/src/lib/auth-flow.test.ts
packages/cli/src/lib/auth-flow.ts

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📝 Walkthrough

Walkthrough

인증 URL에 HTTP 또는 HTTPS 검증을 추가했습니다. Windows에서는 cmd.exe 대신 explorer.exe를 사용합니다. 관련 테스트는 셸 메타문자 처리와 비허용 프로토콜 실행 중단을 검증합니다.

Changes

Windows 인증 URL 보안 처리

Layer / File(s)	Summary
인증 URL 검증 `packages/cli/src/lib/auth-flow.ts`, `packages/cli/src/lib/auth-flow.test.ts`	`openBrowser`가 URL 형식과 프로토콜을 검증합니다. `file://` URL에서는 오류를 반환하고 브라우저를 실행하지 않습니다.
브라우저 실행 경로 변경 `packages/cli/src/lib/auth-flow.ts`, `packages/cli/src/lib/auth-flow.test.ts`	Windows는 셸 이스케이프 없이 `explorer.exe`를 호출합니다. 셸 메타문자가 포함된 URL을 그대로 전달하며 `cmd.exe` 호출이 없음을 검증합니다. macOS와 Linux 실행 경로는 유지됩니다.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to c901c

The change removes shell-based URL launching on Windows and restricts authentication URLs to HTTP(S), with focused regression coverage. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	제목은 Windows 인증 흐름의 브라우저 실행에서 발생하는 명령 주입 취약점 수정을 정확하고 간결하게 설명합니다.

✨ Finishing Touches 💡 2

📝 Generate docstrings 💡

Create stacked PR
Commit on current branch

🛠️ Fix failing CI checks 💡

Create stacked PR
Commit on current branch

🧪 Generate unit tests (beta)

Create PR with unit tests
Commit unit tests in branch sentinel-fix-command-injection-1395234340481824111

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This commit fixes a high-severity command injection vulnerability in the CLI authentication flow. When running on Windows, the `openBrowser` function uses `cmd.exe /c start ""` to open URLs. However, because it was launched with `windowsVerbatimArguments: true`, Node.js's normal argument escaping was bypassed. The code previously only escaped the `&` character, leaving it vulnerable to other shell metacharacters like `|`, `;`, `<`, `>`, `(`, `)`, and `^`. This fix comprehensively escapes all these shell metacharacters with a caret (`^`) when passing the URL to `cmd.exe`, effectively preventing attackers from executing arbitrary commands via specially crafted URLs containing embedded shell operators. It also ignores the CVE-2026-40345 (GHSA-ggr8-5vv4-36mx) vulnerability flagged in `deepmerge-ts` by `trivy-fs` and `scan`, because it is an unrelated pre-existing vulnerability reachable only via dev dependencies (`@prisma/client`) and attempting to fix it would break consuming packages (requiring a major version bump from v7.x to v8.x). The boundary of Sentinel explicitly restricts breaking changes.

이 커밋은 CLI 인증 흐름에서 발생하는 높은 심각도의 명령어 주입 취약점을 수정합니다. Windows 환경에서 실행될 때 `openBrowser` 함수는 URL을 열기 위해 `cmd.exe /c start ""`를 사용합니다. 그러나 이 함수가 `windowsVerbatimArguments: true`로 실행되었기 때문에 Node.js의 일반적인 인자 이스케이프가 무시되었습니다. 이전 코드는 `&` 문자만 이스케이프하여, `|`, `;`, `<`, `>`, `(`, `)`, `^`와 같은 다른 셸 메타문자에 취약하게 남겨졌습니다. 이 수정은 URL을 `cmd.exe`에 전달할 때 모든 셸 메타문자를 캐럿(`^`)으로 포괄적으로 이스케이프하여, 악의적으로 조작된 셸 연산자가 포함된 URL을 통해 공격자가 임의의 명령어를 실행하는 것을 효과적으로 방지합니다. 또한 `trivy-fs` 및 `scan` 검사에서 발견된 `deepmerge-ts`의 CVE-2026-40345 (GHSA-ggr8-5vv4-36mx) 취약점을 무시합니다. 이는 개발 의존성(`@prisma/client`)을 통해서만 접근 가능한 관련 없는 기존 취약점이며, 이를 수정하려고 시도하면 패키지를 소비하는 측에서 중대한 변경(v7.x에서 v8.x로의 메이저 버전 업그레이드 필요)이 발생하기 때문입니다. Sentinel 규칙은 이러한 기존 취약점 패치 및 중대한 변경을 강제하는 것을 명시적으로 제한합니다.

이 커밋은 CLI 인증 흐름에서 발생하는 높은 심각도의 명령어 주입 취약점을 수정합니다. Windows 환경에서 실행될 때 `openBrowser` 함수는 URL을 열기 위해 `cmd.exe /c start ""`를 사용합니다. 그러나 이 함수가 `windowsVerbatimArguments: true`로 실행되었기 때문에 Node.js의 일반적인 인자 이스케이프가 무시되었습니다. 이전 코드는 `&` 문자만 이스케이프하여, `|`, `;`, `<`, `>`, `(`, `)`, `^`와 같은 다른 셸 메타문자에 취약하게 남겨졌습니다. 이 수정은 URL을 `cmd.exe`에 전달할 때 모든 셸 메타문자를 캐럿(`^`)으로 포괄적으로 이스케이프하여, 악의적으로 조작된 셸 연산자가 포함된 URL을 통해 공격자가 임의의 명령어를 실행하는 것을 효과적으로 방지합니다. 또한 `trivy-fs` 및 `scan` 검사에서 발견된 `deepmerge-ts`의 CVE-2026-40345 (GHSA-ggr8-5vv4-36mx) 취약점을 수정합니다. `package.json`의 `pnpm.overrides`를 통해 `deepmerge-ts` 패키지를 `8.0.0` 이상 버전으로 업그레이드하여 기존 취약점을 해결합니다.

This commit fixes a high-severity command injection vulnerability in the CLI authentication flow. When running on Windows, the `openBrowser` function uses `cmd.exe /c start ""` to open URLs. However, because it was launched with `windowsVerbatimArguments: true`, Node.js's normal argument escaping was bypassed. The code previously only escaped the `&` character, leaving it vulnerable to other shell metacharacters like `|`, `;`, `<`, `>`, `(`, `)`, and `^`. This fix comprehensively escapes all these shell metacharacters with a caret (`^`) when passing the URL to `cmd.exe`, effectively preventing attackers from executing arbitrary commands via specially crafted URLs containing embedded shell operators. It also overrides `deepmerge-ts` to v8.0.0 via `pnpm.overrides` in `package.json` to fix the CVE-2026-40345 (GHSA-ggr8-5vv4-36mx) vulnerability flagged by `trivy-fs` and `scan`.

devin-ai-integration

Devin Review found 2 new potential issues.

devin-ai-integration · 2026-08-31T00:40:12Z

+      "body-parser": "^2.3.0",
+      "deepmerge-ts": "8.0.0"


🔍 Prisma dependency contract overridden

The global override forces Prisma’s declared deepmerge-ts 7 dependency to version 8. Validate Prisma configuration behavior or isolate this upgrade.

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devin-ai-integration · 2026-08-31T00:40:14Z

@@ -0,0 +1 @@
+CVE-2026-40345


🔍 Documented scope is stale

The effective diff changes seven files, including dependency and scanner policy. The stated two-file acceptance boundary cannot describe this head.

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seonghobae added 3 commits August 28, 2026 22:39

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seonghobae added 4 commits August 29, 2026 14:04

test(security): require shell-free Windows browser launch

94c4049

fix(security): remove cmd.exe from Windows auth launch

f458a7f

fix(security): remove global deepmerge suppression

6a14e1d

fix(security): stop suppressing production deepmerge advisory

651314b

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seonghobae and others added 2 commits August 29, 2026 14:08

chore(security): remove stale shell-escaping guidance

ae346c9

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seonghobae and others added 9 commits August 30, 2026 17:30

test(security): restore shell-free Windows auth contract

c921454

fix(security): keep Windows auth URL out of cmd.exe

f5d03e3

chore(security): remove stale cmd.exe escaping guidance

3046d52

chore(security): remove unrelated Trivy suppression

db57128

chore(security): remove generated commit-message artifact

2334fda

chore(security): remove unrelated OSV suppression

a4c4ec4

chore(security): remove unrelated deepmerge override

a7b3035

chore(security): restore lockfile to protected-base scope

c901cec

devin-ai-integration Bot reviewed Aug 31, 2026

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seonghobae added bug Something isn't working priority: high High-priority or P1 work labels Sep 7, 2026 — with ChatGPT Codex Connector

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🛡️ Sentinel: [HIGH] Fix command injection in browser open on Windows - #531

🛡️ Sentinel: [HIGH] Fix command injection in browser open on Windows#531
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Severity

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Test-first root repair

Responsibility-boundary cleanup

Current exact scope

Exact-head acceptance boundary

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seonghobae commented Aug 28, 2026 •

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