CVE-2021-25214
Vulnérabilité moyenne dans BIND9 (ISC)
CVSS 6.5 · Moyenne
EPSS 6.2%
ISC•BIND9•Versions : Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1, Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14, Development Branch 9.17 9.17.0 through versiosn before 9.17.12, Open Source Branches 9.9 through 9.11 9.9.3 through versions before 9.11.30, Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1, Open Source Branch 9.8 9.8.5 through 9.8.8
Description
In BIND 9.8.5 -> 9.8.8, 9.9.3 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND 9 Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a malformed IXFR triggering the flaw described above, the named process will terminate due to a failed assertion the next time the transferred secondary zone is refreshed.
Gravité et risque d'exploitation
CVE-2021-25214 obtient un score CVSS de 6.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 6.23 %, ce qui la place devant 93.5 % des CVE référencées.
Que faire ?
- Vérifiez si BIND9 (versions Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.30-S1, Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.14, Development Branch 9.17 9.17.0 through versiosn before 9.17.12, Open Source Branches 9.9 through 9.11 9.9.3 through versions before 9.11.30, Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.14-S1, Open Source Branch 9.8 9.8.5 through 9.8.8) 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://kb.isc.org/v1/docs/cve-2021-25214
- http://www.openwall.com/lists/oss-security/2021/04/29/1
- http://www.openwall.com/lists/oss-security/2021/04/29/2
- http://www.openwall.com/lists/oss-security/2021/04/29/3
- http://www.openwall.com/lists/oss-security/2021/04/29/4
- https://www.debian.org/security/2021/dsa-4909
- https://lists.debian.org/debian-lts-announce/2021/05/msg00001.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VEC2XG4Q2ODTN2C4CGXEIXU3EUTBMK7L/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDSRPCJQ7MZC6CENH5PO3VQOFI7VSWBE/
- https://security.netapp.com/advisory/ntap-20210521-0006/
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf