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FreeBSD: VID-A8C8001B-216C-11E7-80AA-005056925DB4 (CVE-2017-2669): dovecot -- Dovecot DoS when passdb dict was used for authentication

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FreeBSD: VID-A8C8001B-216C-11E7-80AA-005056925DB4 (CVE-2017-2669): dovecot -- Dovecot DoS when passdb dict was used for authentication

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
12/01/2016
Created
07/25/2018
Added
05/02/2017
Modified
05/03/2019

Description

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

Solution(s)

  • freebsd-upgrade-package-dovecot
  • freebsd-upgrade-package-dovecot2

References

  • 97536
  • DSA-3828
  • CVE-2017-2669
  • USN-3258-1
  • USN-3258-2

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