Bug 41378

Summary:	Disable SSLv2 and SSLv3 in Cyrus IMAPD (3.3)
Product:	UCS	Reporter:	Arvid Requate <requate>
Component:	Mail	Assignee:	Felix Botner <botner>
Status:	CLOSED FIXED	QA Contact:	Daniel Tröder <troeder>
Severity:	normal
Priority:	P3	CC:	birkefeld, gohmann, grandjean, requate, schwardt, troeder
Version:	UCS 3.3	Flags:	requate: Patch_Available+
Target Milestone:	UCS 3.3-0-errata
Hardware:	Other
OS:	Linux
What kind of report is it?:	Security Issue	What type of bug is this?:	---
Who will be affected by this bug?:	---	How will those affected feel about the bug?:	---
User Pain:		Enterprise Customer affected?:
School Customer affected?:		ISV affected?:
Waiting Support:		Flags outvoted (downgraded) after PO Review:
Ticket number:		Bug group (optional):	Security
Max CVSS v3 score:
Bug Depends on:	40810
Bug Blocks:

Description Arvid Requate

2016-05-30 13:56:38 CEST

Not fixed yet in UCS 3.3


+++ This bug was initially created as a clone of Bug #40810 +++

Cyrus still supports SSLv3 and even SSLv2 in our default configuration:

> tls_cipher_list: TLSv1:SSLv3:SSLv2:!NULL:!EXPORT:!DES:!LOW:@STRENGTH

This makes UCS 3.2 (and older) vulnerable to the DROWN attack: https://drownattack.com/

UCS 4.0 and 4.1 don't offer SSLv2 anymore, but still SSLv3, which is also considered "not sufficiently secure" -> https://datatracker.ietf.org/doc/rfc7568/

Comment 1 Felix Botner

2016-10-20 10:17:53 CEST

merged changes from 3.2-8 to errata3.3-0

ucs-3.3/ucs-3.3-0/mail/univention-mail-cyrus: r73368

ucs-3.3-0/doc/errata/staging/univention-mail-cyrus.yaml

Comment 2 Daniel Tröder

2016-10-21 09:59:54 CEST

OK: code merge
OK: manual test (echo "A LOGOUT" | openssl s_client -connect...)
OK: automatic test (40_mail/09_imap_ssl_versions)
OK: advisory

SSLv3 cannot be disabled in Cyrus without also disabling TLSv1 :/

Comment 3 Janek Walkenhorst

2016-10-27 17:56:14 CEST

<http://errata.software-univention.de/ucs/3.3/20.html>