CVE-2021-3446

2021-03-2500:00:00

ubuntu.com

libtpms

openssl

data confidentiality

vulnerability

symmetric ciphers

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

CVSS3

5.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS

Percentile

12.6%

JSON

A flaw was found in libtpms in versions before 0.8.2. The commonly used
integration of libtpms with OpenSSL contained a vulnerability related to
the returned IV (initialization vector) when certain symmetric ciphers were
used. Instead of returning the last IV it returned the initial IV to the
caller, thus weakening the subsequent encryption and decryption steps. The
highest threat from this vulnerability is to data confidentiality.