Directory Traversal Affecting glance package, versions <3.0.9
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-GLANCE-3318395
- published12 Feb 2023
- disclosed12 Feb 2023
- creditLiran Tal - Snyk Research Team
Introduced: 12 Feb 2023
CVE-2022-25937 (opens in a new tab)How 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.