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FreeBSD: VID-770D7E91-72AF-11E7-998A-08606E47F965 (CVE-2017-7418): proftpd -- user chroot escape vulnerability

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FreeBSD: VID-770D7E91-72AF-11E7-998A-08606E47F965 (CVE-2017-7418): proftpd -- user chroot escape vulnerability

Severity
2
CVSS
(AV:L/AC:L/Au:N/C:N/I:P/A:N)
Published
03/06/2017
Created
07/25/2018
Added
07/27/2017
Modified
05/03/2019

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.

Solution(s)

  • freebsd-upgrade-package-proftpd

References

  • 97409
  • CVE-2017-7418

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