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freebsdFreeBSD7CAEBE30-D7F1-11E6-A9A5-B499BAEBFEAF
HistoryJan 10, 2017 - 12:00 a.m.

openssl -- timing attack vulnerability

2017-01-1000:00:00
vuxml.freebsd.org
11

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

2.1 Low

CVSS2

Access Vector

LOCAL

Access 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

0.0004 Low

EPSS

Percentile

8.7%

Cesar Pereida Garcia reports:

The signing function in crypto/ecdsa/ecdsa_ossl.c in certain OpenSSL
versions and forks is vulnerable to timing attacks when signing with the
standardized elliptic curve P-256 despite featuring constant-time curve
operations and modular inversion. A software defect omits setting the
BN_FLG_CONSTTIME flag for nonces, failing to take a secure code path in
the BN_mod_inverse method and therefore resulting in a cache-timing attack
vulnerability.
A malicious user with local access can recover ECDSA P-256 private keys.

OSVersionArchitecturePackageVersionFilename
FreeBSDanynoarchopenssl< 1.0.2UNKNOWN
FreeBSDanynoarchlibressl< 2.4.4_1UNKNOWN
FreeBSDanynoarchlibressl-devel< 2.5.0_1UNKNOWN

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

2.1 Low

CVSS2

Access Vector

LOCAL

Access 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

0.0004 Low

EPSS

Percentile

8.7%

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