CVE-2017-3736

MEDIUM

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.

References

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.tenable.com/security/tns-2017-14

https://www.tenable.com/security/tns-2017-15

Details

Source: MITRE

Published: 2017-11-02

Updated: 2019-04-23

Type: CWE-200

Risk Information

CVSS v2.0

Base Score: 4

Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8

Severity: MEDIUM

CVSS v3.0

Base Score: 6.5

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

Impact Score: 3.6

Exploitability Score: 2.8

Severity: MEDIUM