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CVE-2017-3736

Status Candidate

Overview

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. This only affects processors that support the BMI1, BMI2 and ADX extensions like Intel Broadwell (5th generation) and later or AMD Ryzen.

Related Files

Gentoo Linux Security Advisory 201712-03
Posted Dec 15, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201712-3 - Multiple vulnerabilities have been found in OpenSSL, the worst of which may lead to a Denial of Service condition. Versions less than 1.0.2n are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2017-3735, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
MD5 | 424fb2f54f934bbdb186d90e169c3306
Ubuntu Security Notice USN-3475-1
Posted Nov 6, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3475-1 - It was discovered that OpenSSL incorrectly parsed the IPAddressFamily extension in X.509 certificates, resulting in an erroneous display of the certificate in text format. It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2017-3735, CVE-2017-3736
MD5 | 0c64cb5d962437f833874411911c027a
OpenSSL Toolkit 1.0.2m
Posted Nov 4, 2017
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: bn_sqrx8x_internal carry bug on x86_64 was addressed. A malformed X.509 IPAddressFamily out-of-bounds read was addressed.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2017-3735, CVE-2017-3736
MD5 | 10e9e37f492094b9ef296f68f24a7666
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