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CVE-2016-6329

Published: 31 January 2017

OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-over-OpenVPN session using Blowfish in CBC mode, aka a "Sweet32" attack.

Notes

AuthorNote
mdeslaur
openvpn 2.3 and earlier use BF-CBC by default unless the cipher
is specified manually. 2.3.12 was modified to display a warning
if a 64-bit cipher is selected.
Since this is just a warning, downgrading priority to low
sbeattie
fixed in 2.4.0

Priority

Low

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
openvpn
Launchpad, Ubuntu, Debian
artful Not vulnerable
(2.4.0-4ubuntu1)
bionic Not vulnerable
(2.4.0-4ubuntu1)
cosmic Not vulnerable
(2.4.0-4ubuntu1)
disco Not vulnerable
(2.4.0-4ubuntu1)
eoan Not vulnerable
(2.4.0-4ubuntu1)
focal Not vulnerable
(2.4.0-4ubuntu1)
precise Ignored
(end of life)
trusty
Released (2.3.2-7ubuntu3.2)
upstream
Released (2.3.12, 2.4.0)
xenial
Released (2.3.10-1ubuntu2.1)
yakkety
Released (2.3.11-1ubuntu2.1)
zesty Not vulnerable
(2.4.0-4ubuntu1)
groovy Not vulnerable
(2.4.0-4ubuntu1)
hirsute Not vulnerable
(2.4.0-4ubuntu1)
Patches:
upstream: https://github.com/OpenVPN/openvpn/commit/610fdbbdb0abf65c1e7620143afccd62cd162a8f (warning/2.3)
upstream: https://github.com/OpenVPN/openvpn/commit/c94b3ff0f5f1dbd4949f18f69ed3611f82a29021 (warning/trunk)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N