CVE-2016-6329

2017-01-3100:00:00

ubuntu.com

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

4.3 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:N/A:N

0.005 Low

EPSS

Percentile

76.5%

JSON

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

OSVersionArchitecturePackageVersionFilename
ubuntu14.04noarchopenvpn< 2.3.2-7ubuntu3.2UNKNOWN
ubuntu16.04noarchopenvpn< 2.3.10-1ubuntu2.1UNKNOWN
ubuntu16.10noarchopenvpn< 2.3.11-1ubuntu2.1UNKNOWN