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CVE-2018-0735

Status Candidate

Overview

The OpenSSL ECDSA signature algorithm has been shown to be vulnerable to a timing side channel attack. An attacker could use variations in the signing algorithm to recover the private key. Fixed in OpenSSL 1.1.0j (Affected 1.1.0-1.1.0i). Fixed in OpenSSL 1.1.1a (Affected 1.1.1).

Related Files

Ubuntu Security Notice USN-3840-1
Posted Dec 7, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3840-1 - Samuel Weiser discovered that OpenSSL incorrectly handled DSA signing. An attacker could possibly use this issue to perform a timing side-channel attack and recover private DSA keys. Samuel Weiser discovered that OpenSSL incorrectly handled ECDSA signing. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys. This issue only affected Ubuntu 18.04 LTS and Ubuntu 18.10. Various other issues were also addressed.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2018-0734, CVE-2018-0735, CVE-2018-5407
MD5 | 5994d027f01038463cf5bc485763f923
Debian Security Advisory 4348-1
Posted Dec 3, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4348-1 - Several local side channel attacks and a denial of service via large Diffie-Hellman parameters were discovered in OpenSSL, a Secure Sockets Layer toolkit.

tags | advisory, denial of service, local
systems | linux, debian
advisories | CVE-2018-0732, CVE-2018-0734, CVE-2018-0735, CVE-2018-0737, CVE-2018-5407
MD5 | 9f26279cb338cd2494304ede9e253c79
OpenSSL Toolkit 1.1.1a
Posted Nov 21, 2018
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.

Changes: Fixed a timing vulnerability in DSA signature generation and another in ECDSA signature generation. Added EVP_PKEY_ECDH_KDF_X9_63 and ecdh_KDF_X9_63() as replacements for the EVP_PKEY_ECDH_KDF_X9_62 KDF type and ECDH_KDF_X9_62(). Various other updates.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2018-0734, CVE-2018-0735
MD5 | 963deb2272d6be7d4c2458afd2517b73
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