File System Bounds Escape
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.
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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | ftp-srv | < 4.4.0 | 4.4.0 |
References
- https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9
- https://nvd.nist.gov/vuln/detail/CVE-2020-26299
- https://github.com/autovance/ftp-srv/issues/167
- https://github.com/autovance/ftp-srv/issues/225
- https://github.com/autovance/ftp-srv/pull/224
- https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3
- https://www.npmjs.com/package/ftp-srv
- Weakness (CWE)
CWE-22- Platform
- npm
- Package
ftp-srv- Disclosed
- 10.02.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-pmw4-jgxx-pcq9 - CC BY 4.0
Vulnerability history: ftp-srv
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 08.2020 02.2021
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 1
- Medium 1
Disclosures per year
- 2020: 2
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
File System Bounds Escape this entry
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