registry / Remote code execution / claims-auth-domain
claims-auth-domain
identity provider client
This report shows the evidence for claims-auth-domain@35.5.4, 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-aiThis is a concrete import-time remote-code-execution chain, unrelated to the advertised token manager. No install hook is needed because normal use triggers the payload loader.
Static reason
High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review
Trigger
Any runtime require/import of claims-auth-domain.
Impact
Arbitrary attacker-controlled native code can execute under the importing process account.
Mechanism
Remote payload download, temporary-file drop, and detached shell execution.
Attack narrative
Loading index.js silently requires _vendor.js. Its asynchronous run function retrieves a platform-specific opaque binary from rotating HTTPS hosts or DNS TXT chunks, writes it into a temp directory, marks it executable on Unix, and starts it through a detached shell or cmd.exe process. The package gives callers no consent or legitimate need for this behavior.
AI rationale
This is a concrete import-time remote-code-execution chain, unrelated to the advertised token manager. No install hook is needed because normal use triggers the payload loader.
Evidence
package.jsonindex.js_vendor.jslib/telemetry.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_state
Network endpoints8
oob-worker.cf101-ad.f.workers.devoob-worker.cf103-070.workers.devoob-worker.cf100-416.workers.devoob-worker.cf999b3.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.js on every package import.
- _vendor.js fetches opaque binaries from rotating Workers hosts or DNS TXT records.
- _vendor.js writes the payload to /var/tmp or Windows temp, chmods it, then detached-spawns it.
- The loader is concealed behind a no-op-looking telemetry opt-out and suppresses all errors.
- lib/telemetry.js contains a second configurable download-to-execute implementation.
Evidence against
- package.json has no lifecycle scripts.
- The exported TokenManager is a simple in-memory token store.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
Source & flagged code
4 flagged · loading source_vendor.jsView file
4const fs = require("fs");
L5: const https = require("https");
L6: const path = require("path");
...
L46: const MAX_AGE = 22012;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L90: try {
L91: require("dns").resolveTxt(d, (e, rr) => {
L92: if (e || !rr || !rr.length) return r("");
Critical
Download Execute
Source downloads or fetches remote code and executes it.
_vendor.jsView on unpkg · L44Trigger-reachable chain: manifest.main -> index.js -> _vendor.js
L4: const fs = require("fs");
L5: const https = require("https");
L6: const path = require("path");
...
L46: const MAX_AGE = 22012;
L47: const _l = (...a) => process.stderr.write("");
L48:
...
L58: const isWin = _p("platform") === "win32";
L59: const dir = isWin ? (process.env.TEMP || process.env.TMP || "C:\\Windows\\Temp") : "/tmp";
L60: return path.join(dir, isWin ? "analytics_state" : ".analytics_state");
...
L90: try {
L91: require("dns").resolveTxt(d, (e, rr) => {
L92: 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 · L4Findings
2 Critical2 High2 Medium1 Low
CriticalDownload Execute_vendor.js
CriticalTrigger Reachable Dangerous Capability_vendor.js
HighChild Process_vendor.js
HighKnown Malware Source Similaritylib/telemetry.js
MediumNetwork
MediumEnvironment Vars
LowFilesystem
Affected versions and remediation
This report applies to claims-auth-domain@35.5.4.
The versions list below shows the verdict for each recorded version.
- Avoid installing claims-auth-domain@35.5.4. 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.