CVE-2017-3736

openssl: bn_sqrx8x_internal carry bug on x86_64

Published Nov 2, 2017 CVSS 3.0 · 6.5 Medium EPSS 10.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-4017-1 openssl1.0 security update
Debian DSA Debian DSA DSA-4018-1 openssl security update
EUVD EUVD EUVD-2017-12853 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.
Ubuntu USN Ubuntu USN USN-3475-1 OpenSSL vulnerabilities
References
Link Providers
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html cve-icon cve-icon
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html cve-icon cve-icon
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html cve-icon cve-icon
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html cve-icon cve-icon
http://www.securityfocus.com/bid/101666 cve-icon cve-icon
http://www.securitytracker.com/id/1039727 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:0998 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:2185 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:2186 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:2187 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:2568 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:2575 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2018:2713 cve-icon cve-icon
https://github.com/openssl/openssl/commit/4443cf7aa0099e5ce615c18cee249fff77fb0871 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2017-3736 cve-icon
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.asc cve-icon cve-icon
https://security.gentoo.org/glsa/201712-03 cve-icon cve-icon
https://security.netapp.com/advisory/ntap-20171107-0002/ cve-icon cve-icon
https://security.netapp.com/advisory/ntap-20180117-0002/ cve-icon cve-icon
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_us cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2017-3736 cve-icon
https://www.debian.org/security/2017/dsa-4017 cve-icon cve-icon
https://www.debian.org/security/2017/dsa-4018 cve-icon cve-icon
https://www.openssl.org/news/secadv/20171102.txt cve-icon cve-icon cve-icon
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html cve-icon cve-icon
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html cve-icon cve-icon
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html cve-icon cve-icon
https://www.tenable.com/security/tns-2017-14 cve-icon cve-icon
https://www.tenable.com/security/tns-2017-15 cve-icon cve-icon
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
openssl
Published
Updated
Sep 16, 2024, 8:12 PM
Reserved
Dec 16, 2016, 12:00 AM
Status
Modified
Published
Nov 2, 2017, 5:29 PM
Modified
Jun 17, 2026, 1:18 AM
Severity
Moderate
Public date
Nov 2, 2017, 12:00 AM