CVE-2016-1000339

Description

In the Bouncy Castle JCE Provider version 1.55 and earlier the primary engine class used for AES was AESFastEngine. Due to the highly table driven approach used in the algorithm it turns out that if the data channel on the CPU can be monitored the lookup table accesses are sufficient to leak information on the AES key being used. There was also a leak in AESEngine although it was substantially less. AESEngine has been modified to remove any signs of leakage (testing carried out on Intel X86-64) and is now the primary AES class for the BC JCE provider from 1.56. Use of AESFastEngine is now only recommended where otherwise deemed appropriate.

How to fix CVE-2016-1000339

To remediate CVE-2016-1000339, upgrade the affected package to a fixed version below.

—upgrade to 1.56-1 or later
—upgrade to 1.56 or later
—upgrade to 1.56 or later
—upgrade to 1.56 or later

Is CVE-2016-1000339 being exploited?

Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

from 0, < 1.56-1
from 0, < 1.56
from 0, < 1.56
from 0, < 1.56

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N