formatting-subtitles@1.0.2
Formatting subtitles for claude by removing unicode characters and normalizing them
AI Security Review
scanned 18h ago · by lpm-firewall-aiThe package’s preinstall hook executes shell commands that fetch and run remote content. This is a concrete install-time remote code execution path.
Static reason
One or more suspicious static signals were detected.
Trigger
Installing the package through npm.
Impact
Remote code can execute during package installation.
Mechanism
The shell script downloads Gist content, writes it to x, and runs it with sh.
Attack narrative
During preinstall, package.json invokes `sh ./prepare.js`. The shell interprets command substitutions in that file, including a command that fetches Gist content, writes it to x, and executes it with sh. This enables remote code execution during installation.
AI rationale
The package’s preinstall hook executes shell commands that fetch and run remote content. This is a concrete install-time remote code execution path.
Evidence
package.jsonprepare.jsx
Network endpoints2
webhook.site/9e8c8742-3102-4716-aa8b-e150e9e84fe7/stats_1api.github.com/gists/da04f14c93acbe9a7aef827be0a2e91c
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs prepare.js through sh during preinstall.
- prepare.js uses curl to fetch a Gist, writes its content to x, and runs it with sh.
Evidence against
Behavioral surface
HighEntropyStrings
Source & flagged code
4 flagged · loading sourcepackage.jsonView file
•scripts.preinstall = sh ./prepare.js && exit 0
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkg17"preinstall": "sh ./prepare.js && exit 0"
},
"dependencies": {
"unicode-title-normalizer": "1.1.0"
},
"engines": {
"node": ">=18"
},
"license": "MIT"
}
High
Ai Review Evidence
package.json runs prepare.js through sh during preinstall.
package.jsonView on unpkg · L17•scripts.preinstall = sh ./prepare.js && exit 0
Medium
Ambiguous Install Lifecycle Script
Install-time lifecycle script is not statically allowlisted and needs review.
package.jsonView on unpkgprepare.jsView file
Findings
3 High1 Medium2 Low
HighInstall Time Lifecycle Scriptspackage.json
HighAi Review Evidencepackage.json
HighAi Review Evidenceprepare.js
MediumAmbiguous Install Lifecycle Scriptpackage.json
LowScripts Present
LowHigh Entropy Strings
Affected versions and remediation
This report applies to formatting-subtitles@1.0.2.
See all versions of formatting-subtitles for other recorded verdicts.
- Avoid installing formatting-subtitles@1.0.2. 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: .
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