Vulnerability Details : CVE-2020-26299
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).
Vulnerability category: Directory traversal
Exploit prediction scoring system (EPSS) score for CVE-2020-26299
Probability of exploitation activity in the next 30 days: 0.34%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 68 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-26299
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
5.5
|
MEDIUM | AV:N/AC:L/Au:S/C:P/I:P/A:N |
8.0
|
4.9
|
NIST |
|
9.6
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N |
3.1
|
5.8
|
NIST |
|
6.3
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N |
1.8
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2020-26299
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The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: security-advisories@github.com (Primary)
References for CVE-2020-26299
-
https://github.com/autovance/ftp-srv/pull/224
fix(fs): check resolved path against root by matt-forster · Pull Request #224 · autovance/ftp-srv · GitHubPatch;Third Party Advisory
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https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3
fix(fs): check resolved path against root (#224) · autovance/ftp-srv@457b859 · GitHubPatch;Third Party Advisory
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https://www.npmjs.com/package/ftp-srv
ftp-srv - npmProduct;Third Party Advisory
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https://github.com/autovance/ftp-srv/issues/225
Symlink Resolution · Discussion #225 · autovance/ftp-srv · GitHubExploit;Third Party Advisory
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https://github.com/autovance/ftp-srv/issues/167
Windows: User can escape from root directory · Issue #167 · autovance/ftp-srv · GitHubExploit;Patch;Third Party Advisory
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https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9
File System Bounds Escape · Advisory · autovance/ftp-srv · GitHubExploit;Third Party Advisory
Products affected by CVE-2020-26299
- cpe:2.3:a:ftp-srv_project:ftp-srv:*:*:*:*:*:node.js:*:*