GHSA-PMW4-JGXX-PCQ9

Vulnerability from github – Published: 2021-02-10 18:11 – Updated: 2021-02-11 17:04
VLAI?
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.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "ftp-srv"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-26299"
  ],
  "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"
  },
  "details": "### Impact\n\nClients of FTP servers utilizing `ftp-srv` hosted on Windows machines can escape the  FTP user\u0027s defined root folder using the expected FTP commands, for example, `CWD` and `UPDR`.\n\n### Background\n\nWhen 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.\n\n![Screen Shot 2020-12-15 at 6 42 52 PM](https://user-images.githubusercontent.com/3375444/102293941-5a75fb80-3f05-11eb-9d71-0c190a8dcc75.png)\n\n### Patches\nNone at the moment.\n\n### Workarounds\nThere are no workarounds for windows servers. Hosting the server on a different OS mitigates the issue.\n\n### References\n\nIssues: \nhttps://github.com/autovance/ftp-srv/issues/167\nhttps://github.com/autovance/ftp-srv/issues/225\n\n### For more information\nIf you have any questions or comments about this advisory:\nOpen an issue at https://github.com/autovance/ftp-srv.\nPlease email us directly; security@autovance.com.",
  "id": "GHSA-pmw4-jgxx-pcq9",
  "modified": "2021-02-11T17:04:52Z",
  "published": "2021-02-10T18:11:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/autovance/ftp-srv/security/advisories/GHSA-pmw4-jgxx-pcq9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26299"
    },
    {
      "type": "WEB",
      "url": "https://github.com/autovance/ftp-srv/issues/167"
    },
    {
      "type": "WEB",
      "url": "https://github.com/autovance/ftp-srv/issues/225"
    },
    {
      "type": "WEB",
      "url": "https://github.com/autovance/ftp-srv/pull/224"
    },
    {
      "type": "WEB",
      "url": "https://github.com/autovance/ftp-srv/commit/457b859450a37cba10ff3c431eb4aa67771122e3"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/ftp-srv"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "File System Bounds Escape"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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