registry / Data exfiltration / @finxsecdemo/utils
@finxsecdemo/utils
PoC package for internal dependency-confusion security demo. Harmless - see postinstall.js.
This report shows the evidence for @finxsecdemo/utils@1.0.3. 2 of 2 known versions are blocked or flagged. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThis is concrete, unconsented install-time metadata exfiltration, not merely a benign dependency-confusion notice. The package should be blocked.
Static reason
One or more suspicious static signals were detected.
Trigger
npm install (postinstall)
Impact
Unconsented host/user metadata exfiltration and installation tracking.
Mechanism
install-time HTTPS and DNS beacon with local username
Attack narrative
npm executes postinstall.js during installation. That script calls the external OAST host over HTTPS with os.userInfo().username in the URL query, then resolves the same host via DNS. Errors are suppressed, making the callback silent; console claims that no data was exfiltrated contradict the source behavior.
AI rationale
This is concrete, unconsented install-time metadata exfiltration, not merely a benign dependency-confusion notice. The package should be blocked.
Evidence
package.jsonpostinstall.jsindex.js
Network endpoints2
llhvrrffsffmousfvteqie2heq3c7rl55.oast.funllhvrrffsffmousfvteqie2heq3c7rl55.oast.fun/dep-confusion-poc
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs postinstall.js automatically on installation.
- postinstall.js sends an HTTPS request to an external OAST host.
- The request includes os.userInfo().username in its query string.
- postinstall.js also performs a DNS lookup of that external host.
Evidence against
- index.js only exports formatting and auth-header helpers.
- No file writes, shell execution, or credential-file reads were found.
Behavioral surface
EnvironmentVarsNetwork
HighEntropyStrings
NoLicense
Source & flagged code
2 flagged · loading sourcepackage.jsonView file
•scripts.postinstall = node ./postinstall.js
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkg•scripts.postinstall = node ./postinstall.js
Medium
Ambiguous Install Lifecycle Script
Install-time lifecycle script is not statically allowlisted and needs review.
package.jsonView on unpkgFindings
1 High3 Medium3 Low
HighInstall Time Lifecycle Scriptspackage.json
MediumAmbiguous Install Lifecycle Scriptpackage.json
MediumNetwork
MediumEnvironment Vars
LowScripts Present
LowHigh Entropy Strings
LowNo License
Affected versions and remediation
This report applies to @finxsecdemo/utils@1.0.3.
The versions list below shows the verdict for each recorded version.
- Avoid installing @finxsecdemo/utils@1.0.3. 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: .
Source advisory published: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.