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.
Published 2017-11-02 17:29:00
Updated 2019-04-23 19:30:04
View at NVD,   CVE.org
Vulnerability category: Information leak

Exploit prediction scoring system (EPSS) score for CVE-2017-3736

Probability of exploitation activity in the next 30 days: 0.17%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 54 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2017-3736

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.0
MEDIUM AV:N/AC:L/Au:S/C:P/I:N/A:N
8.0
2.9
NIST
6.5
MEDIUM CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.8
3.6
NIST

CWE ids for CVE-2017-3736

References for CVE-2017-3736

Products affected by CVE-2017-3736

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