CVE-2017-7418 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

http://bugs.proftpd.org/show_bug.cgi?id=4295 http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00004.html http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00022.html http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00009.html http://www.securityfocus.com/bid/97409 https://github.com/proftpd/proftpd/commit/ecff21e0d0e84f35c299ef91d7fda088e516d4ed https://github.com/proftpd/proftpd/commit/f59593e6ff730b832dbe8754916cb5c821db579f https://github.com/proftpd/proftpd/pull/444/commits/349addc3be4fcdad9bd4ec01ad1ccd916c898ed8

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.5