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CVE-2021-4160

Vulnérabilité non évaluée dans OpenSSL (OpenSSL)

CVSS 0.0 · Non évaluée
EPSS 3.8%
OpenSSL•OpenSSL•Versions : Fixed in OpenSSL 3.0.1 (Affected 3.0.0), Fixed in OpenSSL 1.1.1m (Affected 1.1.1-1.1.1l), Fixed in OpenSSL 1.0.2zc-dev (Affected 1.0.2-1.0.2zb)

Description

There is a carry propagation bug in the MIPS32 and MIPS64 squaring procedure. Many EC algorithms are affected, including some of the TLS 1.3 default curves. Impact was not analyzed in detail, because the pre-requisites for attack are considered unlikely and include reusing private keys. 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 significant. However, for an attack on TLS to be meaningful, the server would have to share the DH private key among multiple clients, which is no longer an option since CVE-2016-0701. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.0. It was addressed in the releases of 1.1.1m and 3.0.1 on the 15th of December 2021. For the 1.0.2 release it is addressed in git commit 6fc1aaaf3 that is available to premium support customers only. It will be made available in 1.0.2zc when it is released. The issue only affects OpenSSL on MIPS platforms. Fixed in OpenSSL 3.0.1 (Affected 3.0.0). Fixed in OpenSSL 1.1.1m (Affected 1.1.1-1.1.1l). Fixed in OpenSSL 1.0.2zc-dev (Affected 1.0.2-1.0.2zb).

Gravité et risque d'exploitation

CVE-2021-4160 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 3.77 %, ce qui la place devant 89.8 % des CVE référencées.

Que faire ?

  • Vérifiez si OpenSSL (versions Fixed in OpenSSL 3.0.1 (Affected 3.0.0), Fixed in OpenSSL 1.1.1m (Affected 1.1.1-1.1.1l), Fixed in OpenSSL 1.0.2zc-dev (Affected 1.0.2-1.0.2zb)) 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

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