halfcycle@0.4.9
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AI Security Review
scanned 5d ago · by lpm-firewall-aiNo malicious credential theft or unrelated network destination was identified. However, successful hook evaluations automatically emit runtime telemetry when the engagement supplies its URL and token, and the inspected package content provides no user-facing disclosure or opt-out; this warrants a warning.
Static reason
One or more suspicious static signals were detected.; previous stored version diff introduced dangerous source
Trigger
An installed agent hook completes a guard evaluation while a telemetry URL and token are configured.
Impact
The service receives engagement-linked evaluation outcomes and guard results without a user-facing disclosure or opt-out found in the inspected package content.
Mechanism
The hook builds a run record, appends it to a local log, and POSTs it as JSON with a bearer token to the configured telemetry endpoint.
AI rationale
No malicious credential theft or unrelated network destination was identified. However, successful hook evaluations automatically emit runtime telemetry when the engagement supplies its URL and token, and the inspected package content provides no user-facing disclosure or opt-out; this warrants a warning.
Evidence
bin/bin.bundle.mjsdist/cli.js~/.halfcycle/guard-eval-log/{phase}.jsonl
Network endpoints2
control.halfcycle.ai${baseUrl}/telemetry
Decision evidence
public snapshotAI called this Suspicious at 90.0% confidence as Dangerous Capability with medium false-positive risk.
Evidence for warning
- Successful agent-hook evaluations build a run record and call the telemetry emitter.
- When a telemetry URL and token are configured, the emitter posts the run record as JSON with a bearer token.
- The telemetry URL is stored from the engagement credential; the default control service is control.halfcycle.ai.
- The manifest has no install, preinstall, or postinstall lifecycle script.
Evidence against
- The run record includes evaluation outcome, phase and scope counts, plus the guard service result; the builder does not add the source change set itself.
- The CLI’s default control origin is the package’s own Halfcycle service.
Behavioral surface
ChildProcessCryptoEnvironmentVarsEvalFilesystemNetwork
HighEntropyStringsUrlStrings
Source & flagged code
6 flaggedbin/bin.bundle.mjsView file
17601// dist/git.js
L17602: import { spawnSync } from "node:child_process";
L17603: import { existsSync, readFileSync } from "node:fs";
High
Child Process
Package source references child process execution.
bin/bin.bundle.mjsView on unpkg · L17601dist/cli.jsView file
•matchType = previous_version_dangerous_delta
matchedPackage = halfcycle@0.4.8
matchedIdentity = npm:aGFsZmN5Y2xl:0.4.8
similarity = 0.600
summary = stored previous version shares package body but lacks this dangerous source file
Critical
Previous Version Dangerous Delta
This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.
dist/cli.jsView on unpkg5225// dist/control-origin.js
L5226: var DEFAULT_CONTROL_ORIGIN = "https://control.halfcycle.ai";
L5227: function resolveControlOrigin(env = process.env) {
L5228: const configured = env["HALFCYCLE_SERVICE_URL"]?.trim();
...
L5237: // dist/device-signin.js
L5238: import { spawn } from "node:child_process";
L5239: import { platform as platform3 } from "node:os";
Findings
1 Critical5 High3 Medium5 Low
CriticalPrevious Version Dangerous Deltadist/cli.js
HighChild Processbin/bin.bundle.mjs
HighSame File Env Network Executiondist/cli.js
HighSandbox Evasion Gated Capabilitydist/cli.js
HighCross File Remote Execution Contextdist/cli.js
HighRuntime Package Installdist/cli.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowScripts Present
LowEval
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to halfcycle@0.4.9.
See all versions of halfcycle for other recorded verdicts.
- Review the evidence and your use of halfcycle@0.4.9 before allowing it. Restrict the permissions described in this report.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
Evidence last updated: .
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