CVE-2017-3736

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.

Affected products

Alt Linux, Centos, Freebsd, Openssl, Red Hat, Suse, Ubuntu, Virtualbox

Openssl

< 1.0.2m, 1.1.0g

Fix

Available

CVSS 3.0

6.5 MEDIUM

EPSS

10.1% (95th percentile)

Weakness

CWE-200

NVD status

Modified

Published

2017-11-02

No exploit for CVE-2017-3736 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.