FreeBSD : openssl -- timing attack vulnerability (7caebe30-d7f1-11e6-a9a5-b499baebfeaf)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

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.

See also :

http://seclists.org/oss-sec/2017/q1/52
http://www.nessus.org/u?d92b1e44

Solution :

Update the affected packages.

Risk factor :

High

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 96412 ()

Bugtraq ID:

CVE ID: CVE-2016-7056

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