CVE-2017-3732

MEDIUM

Description

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. 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. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.

References

http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html

http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html

http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

http://www.securityfocus.com/bid/95814

http://www.securitytracker.com/id/1037717

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/a59b90bf491410f1f2bc4540cc21f1980fd14c5b

https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.asc

https://security.gentoo.org/glsa/201702-07

https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_us

https://www.openssl.org/news/secadv/20170126.txt

https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

https://www.tenable.com/security/tns-2017-04

Details

Source: MITRE

Published: 2017-05-04

Updated: 2019-04-23

Type: CWE-200

Risk Information

CVSS v2.0

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3.0

Base Score: 5.9

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

Impact Score: 3.6

Exploitability Score: 2.2

Severity: MEDIUM