T03 · Remote Payload Retrieval and Execution
- Location
index.ts:1- Finding
Remote TypeScript Dependency Executed Without Cryptographic Integrity Verification
- Content
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Vulnerability Details
File Location:
index.ts:1
Vulnerability Type: Remote dependency retrieval without integrity verification
Risk Level: Mediumtypescript import { z } from "https://deno.land/x/zod@v3.22.4/mod.ts";Technical Analysis
The application imports and executes TypeScript directly from an externally hosted HTTPS URL. Although the URL contains a version identifier, the project does not include a dependency lockfile, integrity hash, or vendored copy that cryptographically binds the imported content to the version reviewed during this audit.
Consequently, the effective code executed by the Skill depends on the security and immutability of the remote package source and its delivery infrastructure. Module initialization code runs with the permissions granted to the Deno process. This Skill legitimately requires local file access and subprocess execution, which could increase the consequences if the imported module were replaced or compromised.
Attack Path
- An attacker compromises the remote package repository, its publishing account, hosting infrastructure, or another relevant dependency-delivery component.
- The attacker causes malicious content to be served from the imported URL.
- A user starts the Skill in an environment where the dependency is not already securely pinned and cached.
- Deno retrieves and evaluates the remote module.
- Malicious module initialization code executes using the permissions granted to the Skill process.
This path requires compromise or unauthorized mutation of the external dependency source; the repository itself does not contain evidence that such a compromise has occurred.
Impact Assessment
Successful exploitation could execute arbitrary code within the Deno process's permission boundary. Depending on the runtime permissions supplied when the Skill is launched, this could expose files available to the process, invoke local programs, alte ...[truncated 219 chars]
- Remediation
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Remediation Suggestions
- Vendor the reviewed Zod dependency into the project so runtime execution does not depend on mutable remote content.
- Alternatively, generate and commit a Deno lockfile containing integrity information, and require frozen or locked dependency resolution during deployment.
- Pin all transitive dependencies and verify their integrity in CI before release.
- Restrict Deno permissions to the minimum required directories, executable commands, and network destinations.
- Disable unnecessary runtime network access after dependencies have been securely resolved.
- Define a dependency update process that includes source review, integrity verification, and lockfile updates.