Описание
pnpm: Binary ZIP extraction allows arbitrary file write via path traversal (Zip Slip)
Summary
A path traversal vulnerability in pnpm's binary fetcher allows malicious packages to write files outside the intended extraction directory. The vulnerability has two attack vectors: (1) Malicious ZIP entries containing ../ or absolute paths that escape the extraction root via AdmZip's extractAllTo, and (2) The BinaryResolution.prefix field is concatenated into the extraction path without validation, allowing a crafted prefix like ../../evil to redirect extracted files outside targetDir.
Details
The vulnerability exists in the binary fetching and extraction logic:
1. Unvalidated ZIP Entry Extraction (fetching/binary-fetcher/src/index.ts)
AdmZip's extractAllTo does not validate entry paths for path traversal:
A ZIP entry with path ../../../.npmrc will be written outside nodeDir.
2. Unvalidated Prefix in BinaryResolution (resolving/resolver-base/src/index.ts)
The basename variable comes from BinaryResolution.prefix and is used directly in path construction:
PoC
Attack Vector 1: ZIP Entry Path Traversal
Attack Vector 2: Prefix Traversal via malicious resolution:
Impact
- All pnpm users who install packages with binary assets
- Users who configure custom Node.js binary locations
- CI/CD pipelines that auto-install binary dependencies
- Can overwrite config files, scripts, or other sensitive files leading to RCE
Verified on pnpm main @ commit 5a0ed1d45.
Пакеты
pnpm
< 10.28.1
10.28.1
Связанные уязвимости
pnpm is a package manager. Prior to version 10.28.1, a path traversal vulnerability in pnpm's binary fetcher allows malicious packages to write files outside the intended extraction directory. The vulnerability has two attack vectors: (1) Malicious ZIP entries containing `../` or absolute paths that escape the extraction root via AdmZip's `extractAllTo`, and (2) The `BinaryResolution.prefix` field is concatenated into the extraction path without validation, allowing a crafted prefix like `../../evil` to redirect extracted files outside `targetDir`. The issue impacts all pnpm users who install packages with binary assets, users who configure custom Node.js binary locations and CI/CD pipelines that auto-install binary dependencies. It can lead to overwriting config files, scripts, or other sensitive files leading to RCE. Version 10.28.1 contains a patch.
pnpm is a package manager. Prior to version 10.28.1, a path traversal ...
Уязвимость сценариев fetching/binary-fetcher/src/index.ts и resolving/resolver-base/src/index.ts менеджера пакетов pnpm, позволяющая нарушителю записывать произвольные файлы