Bug 41378 – Disable SSLv2 and SSLv3 in Cyrus IMAPD (3.3)

Bug 41378 - Disable SSLv2 and SSLv3 in Cyrus IMAPD (3.3)


Summary:	Disable SSLv2 and SSLv3 in Cyrus IMAPD (3.3)

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	Mail
Version:	UCS 3.3
Hardware:	Other Linux

Importance:	P3 normal (vote)
Target Milestone:	UCS 3.3-0-errata
Assigned To:	Felix Botner
QA Contact:	Daniel Tröder

URL:
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Depends on:	40810
Blocks:
	Show dependency tree / graph

Reported:	2016-05-30 13:56 CEST by Arvid Requate
Modified:	2016-10-27 17:56 CEST (History)
CC List:	6 users (show)

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What kind of report is it?:	Security Issue
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Flags:	requate: Patch_Available+

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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>