CVE-2023-4481
Vulnérabilité élevée dans Junos OS (Juniper Networks, Inc.)
Description
An Improper Input Validation vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When certain specific crafted BGP UPDATE messages are received over an established BGP session, one BGP session may be torn down with an UPDATE message error, or the issue may propagate beyond the local system which will remain non-impacted, but may affect one or more remote systems. This issue is exploitable remotely as the crafted UPDATE message can propagate through unaffected systems and intermediate BGP speakers. Continuous receipt of the crafted BGP UPDATE messages will create a sustained Denial of Service (DoS) condition for impacted devices. This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session. Improper Input Validation, Denial of Service vulnerability in Juniper Networks, Inc. Junos OS (BGP, rpd modules), Juniper Networks, Inc. Junos OS Evolved (BGP, rpd modules) allows Fuzzing.This issue affects Junos OS: * All versions before 20.4R3-S10, * from 21.1R1 through 21.*, * from 21.2 before 21.2R3-S5, * from 21.3 before 21.3R3-S5, * from 21.4 before 21.4R3-S7 (unaffected from 21.4R3-S5, affected from 21.4R3-S6) * from 22.1 before 22.1R3-S4, * from 22.2 before 22.2R3-S3, * from 22.3 before 22.3R3-S1, * from 22.4 before 22.4R3, * from 23.2 before 23.2R2. Junos OS Evolved: * All versions before 20.4R3-S10-EVO, * from 21.2-EVO before 21.2R3-S7-EVO, * from 21.3-EVO before 21.3R3-S5-EVO, * from 21.4-EVO before 21.4R3-S5-EVO, * from 22.1-EVO before 22.1R3-S4-EVO, * from 22.2-EVO before 22.2R3-S3-EVO, * from 22.3-EVO before 22.3R3-S1-EVO, * from 22.4-EVO before 22.4R3-EVO, * from 23.2-EVO before 23.2R2-EVO.
Gravité et risque d'exploitation
CVE-2023-4481 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 18.35 %, ce qui la place devant 97.2 % des CVE référencées.
Que faire ?
- Vérifiez si Junos OS (versions <21.4R3-S5-EVO, <21.4R3-S7, 23.2, <23.2R2, <23.2R2-EVO, 0, 22.4-EVO, <20.4R3-S10, 21.2, 21.4, 22.2, 22.1, <22.3R3-S1, <22.4R3-EVO, 21.4-EVO, <21.3R3-S5, 22.2-EVO, 22.4, <22.2R3-S3-EVO, 21.3-EVO, <22.2R3-S3, <21.3R3-S5-EVO, 21.2-EVO, <21.2R3-S5, 22.1-EVO, 22.3-EVO, <22.3R3-S1-EVO, <22.1R3-S4-EVO, 23.2-EVO, <=21.*, <22.1R3-S4, <22.4R3, <21.2R3-S7-EVO, <20.4R3-S10-EVO, 21.3, 22.3, 21.1R1) 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.