ubuntu-cve-2017-7418
Vulnerability from osv_ubuntu
Published
2017-04-04 17:59
Modified
2026-04-22 07:38
Summary
Details

ProFTPD before 1.3.5e and 1.3.6 before 1.3.6rc5 controls whether the home directory of a user could contain a symbolic link through the AllowChrootSymlinks configuration option, but checks only the last path component when enforcing AllowChrootSymlinks. Attackers with local access could bypass the AllowChrootSymlinks control by replacing a path component (other than the last one) with a symbolic link. The threat model includes an attacker who is not granted full filesystem access by a hosting provider, but can reconfigure the home directory of an FTP user.

Severity
5.5 (Medium)
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "proftpd-basic",
            "binary_version": "1.3.5a-1ubuntu0.1"
          },
          {
            "binary_name": "proftpd-mod-geoip",
            "binary_version": "1.3.5a-1ubuntu0.1"
          },
          {
            "binary_name": "proftpd-mod-ldap",
            "binary_version": "1.3.5a-1ubuntu0.1"
          },
          {
            "binary_name": "proftpd-mod-mysql",
            "binary_version": "1.3.5a-1ubuntu0.1"
          },
          {
            "binary_name": "proftpd-mod-odbc",
            "binary_version": "1.3.5a-1ubuntu0.1"
          },
          {
            "binary_name": "proftpd-mod-pgsql",
            "binary_version": "1.3.5a-1ubuntu0.1"
          },
          {
            "binary_name": "proftpd-mod-sqlite",
            "binary_version": "1.3.5a-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "proftpd-dfsg",
        "purl": "pkg:deb/ubuntu/proftpd-dfsg@1.3.5a-1ubuntu0.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.5-2",
        "1.3.5a-1",
        "1.3.5a-1build1",
        "1.3.5a-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "ProFTPD before 1.3.5e and 1.3.6 before 1.3.6rc5 controls whether the home directory of a user could contain a symbolic link through the AllowChrootSymlinks configuration option, but checks only the last path component when enforcing AllowChrootSymlinks. Attackers with local access could bypass the AllowChrootSymlinks control by replacing a path component (other than the last one) with a symbolic link. The threat model includes an attacker who is not granted full filesystem access by a hosting provider, but can reconfigure the home directory of an FTP user.",
  "id": "UBUNTU-CVE-2017-7418",
  "modified": "2026-04-22T07:38:13Z",
  "published": "2017-04-04T17:59:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-7418"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/proftpd/proftpd/commit/ecff21e0d0e84f35c299ef91d7fda088e516d4ed"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/proftpd/proftpd/commit/f59593e6ff730b832dbe8754916cb5c821db579f"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/proftpd/proftpd/pull/444/commits/349addc3be4fcdad9bd4ec01ad1ccd916c898ed8"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2017-7418"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2017-7418"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.