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
| Author | Note |
|---|---|
| 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
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)
|
|
| groovy |
Not vulnerable
(2.4.0-4ubuntu1)
|
|
| hirsute |
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)
|
|
|
Patches: upstream: https://github.com/OpenVPN/openvpn/commit/610fdbbdb0abf65c1e7620143afccd62cd162a8f upstream: https://github.com/OpenVPN/openvpn/commit/c94b3ff0f5f1dbd4949f18f69ed3611f82a29021 |
||
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 |