CVE-2017-3736 Information

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Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Reference

http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html http://www.securityfocus.com/bid/101666 http://www.securitytracker.com/id/1039727 https://access.redhat.com/errata/RHSA-2018:0998 https://access.redhat.com/errata/RHSA-2018:2185 https://access.redhat.com/errata/RHSA-2018:2186 https://access.redhat.com/errata/RHSA-2018:2187 https://access.redhat.com/errata/RHSA-2018:2568 https://access.redhat.com/errata/RHSA-2018:2575 https://access.redhat.com/errata/RHSA-2018:2713 https://github.com/openssl/openssl/commit/4443cf7aa0099e5ce615c18cee249fff77fb0871 https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.asc https://security.gentoo.org/glsa/201712-03 https://security.netapp.com/advisory/ntap-20171107-0002/ https://security.netapp.com/advisory/ntap-20180117-0002/ https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_us https://www.debian.org/security/2017/dsa-4017 https://www.debian.org/security/2017/dsa-4018 https://www.openssl.org/news/secadv/20171102.txt https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html https://www.tenable.com/security/tns-2017-14 https://www.tenable.com/security/tns-2017-15

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5