GHSA-pmw4-jgxx-pcq9

Source

https://github.com/advisories/GHSA-pmw4-jgxx-pcq9

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/02/GHSA-pmw4-jgxx-pcq9/GHSA-pmw4-jgxx-pcq9.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-pmw4-jgxx-pcq9

Aliases

CVE-2020-26299

Published

2021-02-10T18:11:34Z

Modified

2026-05-07T05:02:27Z

Summary

File System Bounds Escape

Details

Impact

Clients of FTP servers utilizing ftp-srv hosted on Windows machines can escape the FTP user's defined root folder using the expected FTP commands, for example, CWD and UPDR.

Background

When windows separators exist within the path (\), path.resolve leaves the upper pointers intact and allows the user to move beyond the root folder defined for that user. We did not take that into account when creating the path resolve function.

Screen Shot 2020-12-15 at 6 42 52 PM

Patches

None at the moment.

Workarounds

There are no workarounds for windows servers. Hosting the server on a different OS mitigates the issue.

References

Issues: https://github.com/autovance/ftp-srv/issues/167 https://github.com/autovance/ftp-srv/issues/225

For more information

If you have any questions or comments about this advisory: Open an issue at https://github.com/autovance/ftp-srv. Please email us directly; security@autovance.com.

Database specific

{
    "cwe_ids":  [
        "CWE-22"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2021-02-10T18:11:21Z",
    "nvd_published_at":  "2021-02-10T18:15:00Z",
    "severity":  "MODERATE"
}

References

Affected packages

npm / ftp-srv

Package

Name: ftp-srv; View open source insights on deps.dev
Purl: pkg:npm/ftp-srv

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

4.4.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/02/GHSA-pmw4-jgxx-pcq9/GHSA-pmw4-jgxx-pcq9.json"