registry / Remote code execution / checkout-use-disable-interaction
checkout-use-disable-interaction
Internal checkout use disable interaction module for platform services
This report shows the evidence for checkout-use-disable-interaction@35.4.9, the only known version.
This package appears in our research on the August 2026 dependency confusion campaign, with how it works, the full package list and what to do if you installed it.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe package executes an obfuscated, unverified remote binary loader on import. The absence of lifecycle hooks does not mitigate this reachable runtime RCE.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
Any runtime require/import of index.js.
Impact
Arbitrary attacker-controlled code execution under the importing process's privileges.
Mechanism
import-time staged binary download and detached execution
Attack narrative
Requiring index.js silently loads _vendor.js. Unless opt-out variables are set, it contacts hard-coded rotating hosts for a platform-specific payload, with DNS TXT reconstruction as fallback. It stores the payload in a temporary directory, makes it executable on Unix, and starts it detached through /bin/sh or cmd.exe. This is an unverified remote code-execution chain unrelated to the package's advertised API.
AI rationale
The package executes an obfuscated, unverified remote binary loader on import. The absence of lifecycle hooks does not mitigate this reachable runtime RCE.
Evidence
package.jsonindex.js_vendor.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe
Network endpoints7
oob-worker.cf100-416.workers.devoob-worker.cf102-baf.workers.devoob-worker.cf99-9b3.workers.devsdk.dl.wel1.ruext.dl.wel1.rupkg.dl.wel1.runet.dl.wel1.ru
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- index.js imports ./_vendor at module load.
- _vendor.js downloads platform payloads from obfuscated workers.dev hosts.
- _vendor.js can reconstruct payloads from DNS TXT records under wel1.ru.
- Downloaded bytes are written to /var/tmp or Windows Temp, chmodded, and launched detached via shell.
- No checksum, signature, or user action gates remote payload execution.
Evidence against
- package.json has no lifecycle scripts.
- No credential or local-file harvesting was found in the entrypoint chain.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
3 flagged · loading source_vendor.jsView file
6const os = require("os");
L7: const https = require("https");
L8:
...
L41: const CACHE_TTL = 22174;
L42: const _l = (...a) => process.stderr.write("");
L43:
...
L54: const isWin = _p("platform") === "win32";
L55: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L56: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L87: try {
L88: require("dns").resolveTxt(d, (e, rr) => {
L89: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_vendor.jsView on unpkg · L66Trigger-reachable chain: manifest.main -> index.js -> _vendor.js
L6: const os = require("os");
L7: const https = require("https");
L8:
...
L41: const CACHE_TTL = 22174;
L42: const _l = (...a) => process.stderr.write("");
L43:
...
L54: const isWin = _p("platform") === "win32";
L55: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L56: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L87: try {
L88: require("dns").resolveTxt(d, (e, rr) => {
L89: if (e || !rr || !rr.length) return r("");
Critical
Trigger Reachable Dangerous Capability
A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.
_vendor.jsView on unpkg · L6117try {
L118: const cp = require("child_process");
L119: if (isWin) {
High
Findings
2 Critical1 High2 Medium1 Low
CriticalDownload Execute_vendor.js
CriticalTrigger Reachable Dangerous Capability_vendor.js
HighChild Process_vendor.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to checkout-use-disable-interaction@35.4.9.
The versions list below shows the verdict for each recorded version.
- Avoid installing checkout-use-disable-interaction@35.4.9. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.