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remove 3des-cbc from the client's default proposal;
64-bit block ciphers are not safe in 2016 and we don't want to wait until
attacks like sweet32 are extended to SSH.

As 3des-cbc was the only mandatory cipher in the SSH RFCs, this may
cause problems connecting to older devices using the defaults, but
it's highly likely that such devices already need explicit
configuration for KEX and hostkeys anyway.

ok deraadt, markus, dtucker

Upstream-ID: a505dfe65c6733af0f751b64cbc4bb7e0761bc2f
This commit is contained in:
djm@openbsd.org 2016-09-05 14:02:42 +00:00 committed by Darren Tucker
parent b33ad6d997
commit da95318dbe
2 changed files with 5 additions and 5 deletions
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4
myproposal.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: myproposal.h,v 1.50 2016/02/09 05:30:04 djm Exp $ */
/* $OpenBSD: myproposal.h,v 1.52 2016/09/05 14:02:42 djm Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
@ -120,7 +120,7 @@
AESGCM_CIPHER_MODES
#define KEX_CLIENT_ENCRYPT KEX_SERVER_ENCRYPT "," \
"aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc"
"aes128-cbc,aes192-cbc,aes256-cbc"
#define KEX_SERVER_MAC \
"umac-64-etm@openssh.com," \

6
ssh_config.5
View File

@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" $OpenBSD: ssh_config.5,v 1.236 2016/07/22 07:00:46 djm Exp $
.Dd $Mdocdate: July 22 2016 $
.\" $OpenBSD: ssh_config.5,v 1.237 2016/09/05 14:02:42 djm Exp $
.Dd $Mdocdate: September 5 2016 $
.Dt SSH_CONFIG 5
.Os
.Sh NAME
@ -488,7 +488,7 @@ The default is:
chacha20-poly1305@openssh.com,
aes128-ctr,aes192-ctr,aes256-ctr,
aes128-gcm@openssh.com,aes256-gcm@openssh.com,
aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc
aes128-cbc,aes192-cbc,aes256-cbc
.Ed
.Pp
The list of available ciphers may also be obtained using the