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CVE-2020-8625

Vulnérabilité élevée dans BIND9 (ISC)

CVSS 8.1 · Élevée
EPSS 64.2%
ISC•BIND9•Versions : Open Source Branches 9.12 though 9.16 9.12.0 through versions before 9.16.12, Development Branch 9.17 9.17.0 through versions before 9.17.2, Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.12-S1, Supported Preview Branch 9.11-S 9.11.3-S1 through versions before 9.11.28-S1, Open Source Branches 9.5 though 9.11 9.5.0 through versions before 9.11.28

Description

BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -> 9.11.27, 9.12.0 -> 9.16.11, and versions BIND 9.11.3-S1 -> 9.11.27-S1 and 9.16.8-S1 -> 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch

Gravité et risque d'exploitation

CVE-2020-8625 obtient un score CVSS de 8.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 64.16 %, ce qui la place devant 99.2 % des CVE référencées.

Que faire ?

  • Vérifiez si BIND9 (versions Open Source Branches 9.12 though 9.16 9.12.0 through versions before 9.16.12, Development Branch 9.17 9.17.0 through versions before 9.17.2, Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.12-S1, Supported Preview Branch 9.11-S 9.11.3-S1 through versions before 9.11.28-S1, Open Source Branches 9.5 though 9.11 9.5.0 through versions before 9.11.28) 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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