Bug 41378 - Disable SSLv2 and SSLv3 in Cyrus IMAPD (3.3)
Disable SSLv2 and SSLv3 in Cyrus IMAPD (3.3)
Product: UCS
Classification: Unclassified
Component: Mail
UCS 3.3
Other Linux
: P3 normal (vote)
: UCS 3.3-0-errata
Assigned To: Felix Botner
Daniel Tröder
Depends on: 40810
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Reported: 2016-05-30 13:56 CEST by Arvid Requate
Modified: 2016-10-27 17:56 CEST (History)
6 users (show)

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


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Description Arvid Requate univentionstaff 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 univentionstaff 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

Comment 2 Daniel Tröder univentionstaff 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 univentionstaff 2016-10-27 17:56:14 CEST