Vulnerability · Published Feb 10, 2021 · Assigned by GitHub_M
CVE-2020-26299File System Bounds Escape
Medium 6.3
In plain English
A medium-severity path traversal in ftp-srv from autovance. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 80% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
ftp-srv is an open-source FTP server designed to be simple yet configurable. In ftp-srv before version 4.4.0 there is a path-traversal vulnerability. 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. 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. The issue is patched in version 4.4.0 (commit 457b859450a37cba10ff3c431eb4aa67771122e3).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | ftp-srv | 4.4.0 | GHSA-pmw4-jgxx-pcq9 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
References
- https://www.npmjs.com/package/ftp-srv x_refsource_MISC
- https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9 x_refsource_CONFIRM
- https://github.com/autovance/ftp-srv/issues/167 x_refsource_MISC
- https://github.com/autovance/ftp-srv/issues/225 x_refsource_MISC
- https://github.com/autovance/ftp-srv/pull/224 x_refsource_MISC
- https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3 x_refsource_MISC