CVE-2017-3736
Vulnérabilité non évaluée dans OpenSSL (OpenSSL Software Foundation)
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.
Gravité et risque d'exploitation
CVE-2017-3736 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 10.13 %, ce qui la place devant 95.6 % des CVE référencées.
Que faire ?
- Vérifiez si OpenSSL (versions 1.0.2 - 1.0.2l, 1.1.0 - 1.1.0f) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://security.netapp.com/advisory/ntap-20171107-0002/
- https://access.redhat.com/errata/RHSA-2018:2185
- https://github.com/openssl/openssl/commit/4443cf7aa0099e5ce615c18cee249fff77fb0871
- https://access.redhat.com/errata/RHSA-2018:2186
- http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- https://access.redhat.com/errata/RHSA-2018:2713
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://www.debian.org/security/2017/dsa-4018
- https://security.gentoo.org/glsa/201712-03
- https://access.redhat.com/errata/RHSA-2018:0998
- https://access.redhat.com/errata/RHSA-2018:2575
- https://www.tenable.com/security/tns-2017-15
- http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
- http://www.securityfocus.com/bid/101666
- https://access.redhat.com/errata/RHSA-2018:2568
- https://www.openssl.org/news/secadv/20171102.txt
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
- https://www.debian.org/security/2017/dsa-4017
- https://www.tenable.com/security/tns-2017-14
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.asc
- http://www.securitytracker.com/id/1039727
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_us
- https://access.redhat.com/errata/RHSA-2018:2187
- https://security.netapp.com/advisory/ntap-20180117-0002/
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
