CVE-2020-1632
Vulnérabilité élevée dans Junos OS (Juniper Networks)
Description
In a certain condition, receipt of a specific BGP UPDATE message might cause Juniper Networks Junos OS and Junos OS Evolved devices to advertise an invalid BGP UPDATE message to other peers, causing the other peers to terminate the established BGP session, creating a Denial of Service (DoS) condition. For example, Router A sends a specific BGP UPDATE to Router B, causing Router B to send an invalid BGP UPDATE message to Router C, resulting in termination of the BGP session between Router B and Router C. This issue might occur when there is at least a single BGP session established on the device that does not support 4 Byte AS extension (RFC 4893). Repeated receipt of the same BGP UPDATE can result in an extended DoS condition. This issue affects Juniper Networks Junos OS: 16.1 versions prior to 16.1R7-S6; 16.2 versions prior to 16.2R2-S11; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2; 17.2 versions prior to 17.2R1-S9, 17.2R2-S8, 17.2R3-S3; 17.2X75 versions prior to 17.2X75-D105, 17.2X75-D110, 17.2X75-D44; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7; 17.4 versions prior to 17.4R2-S8, 17.4R3; 18.1 versions prior to 18.1R3-S8; 18.2 versions prior to 18.2R2-S6, 18.2R3-S2; 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D51, 18.2X75-D60; 18.3 versions prior to 18.3R1-S6, 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R1-S5, 18.4R3; 18.4 version 18.4R2 and later versions; 19.1 versions prior to 19.1R1-S3, 19.1R2; 19.2 versions prior to 19.2R1-S2, 19.2R2. This issue does not affect Juniper Networks Junos OS prior to 16.1R1. This issue affects Juniper Networks Junos OS Evolved prior to 19.2R2-EVO.
Gravité et risque d'exploitation
CVE-2020-1632 obtient un score CVSS de 8.6/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 1.06 %, ce qui la place devant 64.0 % des CVE référencées.
Que faire ?
- Vérifiez si Junos OS (versions 16.1, <17.1R2-S11, 17.1R3-S2, 17.2X75, <18.4R1-S5, 18.4R3, 19.2, <19.2R2-EVO, <18.2X75-D12, 18.2X75-D33, 18.2X75-D411, 18.2X75-D420, 18.2X75-D51, 18.2X75-D60, 16.2, 18.2, <17.2X75-D105, 17.2X75-D110, 17.2X75-D44, 18.3, 19.1, <18.3R1-S6, 18.3R2-S3, 18.3R3, <18.2R2-S6, 18.2R3-S2, <17.4R2-S8, 17.4R3, 17.1, 18.1, 17.4, 18.4, 17.3, <19.2R1-S2, 19.2R2, 18.2X75, <16.1R7-S6, <16.2R2-S11, <19.1R1-S3, 19.1R2, <17.2R1-S9, 17.2R2-S8, 17.2R3-S3, <17.3R2-S5, 17.3R3-S7, 17.2, <18.1R3-S8) 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.