CVE-2020-1641
Vulnérabilité moyenne dans Junos OS (Juniper Networks)
Description
A Race Condition vulnerability in Juniper Networks Junos OS LLDP implementation allows an attacker to cause LLDP to crash leading to a Denial of Service (DoS). This issue occurs when crafted LLDP packets are received by the device from an adjacent device. Multiple LACP flaps will occur after LLDP crashes. An indicator of compromise is to evaluate log file details for lldp with RLIMIT. Intervention should occur before 85% threshold of used KB versus maximum available KB memory is reached. show log messages | match RLIMIT | match lldp | last 20 Matching statement is " /kernel: %KERNEL-[number]: Process ([pid #],lldpd) has exceeded 85% of RLIMIT_DATA: " with [] as variable data to evaluate for. This issue affects: Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S15; 12.3X48 versions prior to 12.3X48-D95; 15.1 versions prior to 15.1R7-S6; 15.1X49 versions prior to 15.1X49-D200; 15.1X53 versions prior to 15.1X53-D593; 16.1 versions prior to 16.1R7-S7; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2; 17.2 versions prior to 17.2R1-S9, 17.2R3-S3; 17.3 versions prior to 17.3R2-S5, 17.3R3-S6; 17.4 versions prior to 17.4R2-S4, 17.4R3; 18.1 versions prior to 18.1R3-S5; 18.2 versions prior to 18.2R2-S7, 18.2R3; 18.2X75 versions prior to 18.2X75-D12, 18.2X75-D33, 18.2X75-D50, 18.2X75-D420; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R1-S5, 18.4R2; 19.1 versions prior to 19.1R1-S4, 19.1R2.
Gravité et risque d'exploitation
CVE-2020-1641 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 0.40 %, ce qui la place devant 32.6 % des CVE référencées.
Que faire ?
- Vérifiez si Junos OS (versions 16.1, <17.1R2-S11, 17.1R3-S2, 15.1X49, <18.4R1-S5, 18.4R2, <12.3R12-S15, 18.2, <15.1X49-D200, <18.2X75-D12, 18.2X75-D33, 18.2X75-D50, 18.2X75-D420, <12.3X48-D95, <17.3R2-S5, 17.3R3-S6, <15.1R7-S6, 18.3, 19.1, <17.2R1-S9, 17.2R3-S3, 15.1, 17.1, <18.1R3-S5, 18.1, 17.4, 12.3, 15.1X53, 18.4, 17.3, <18.2R2-S7, 18.2R3, <15.1X53-D593, <17.4R2-S4, 17.4R3, 18.2X75, <16.1R7-S7, 12.3X48, <18.3R1-S7, 18.3R2-S3, 18.3R3, <19.1R1-S4, 19.1R2, 17.2) 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.