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Fixed

LIN5-22395 : Security Advisory - openssl - CVE-2016-7056

Created: Jan 18, 2017    Updated: Feb 11, 2019
Resolved Date: Feb 7, 2017
Found In Version: 5.0.1.38
Fix Version: 5.0.1.39
Severity: Standard
Applicable for: Wind River Linux 5
Component/s: Userspace

Description

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.

References:

http://seclists.org/oss-sec/2017/q1/52
http://eprint.iacr.org/2016/1195

Fix available at: https://git.openssl.org/?p=openssl.git;a=commit;h=f54be179aa4cbbd944728771d7d59ed588158a12

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