CVE-2021-0283
Vulnérabilité élevée dans Junos OS (Juniper Networks)
Description
A buffer overflow vulnerability in the TCP/IP stack of Juniper Networks Junos OS allows an attacker to send specific sequences of packets to the device thereby causing a Denial of Service (DoS). By repeatedly sending these sequences of packets to the device, an attacker can sustain the Denial of Service (DoS) condition. The device will abnormally shut down as a result of these sent packets. A potential indicator of compromise will be the following message in the log files: "eventd[13955]: SYSTEM_ABNORMAL_SHUTDOWN: System abnormally shut down" These issue are only triggered by traffic destined to the device. Transit traffic will not trigger these issues. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S19; 15.1 versions prior to 15.1R7-S10; 16.1 version 16.1R1 and later versions; 16.2 version 16.2R1 and later versions; 17.1 version 17.1R1 and later versions; 17.2 version 17.2R1 and later versions; 17.3 versions prior to 17.3R3-S12; 17.4 version 17.4R1 and later versions; 18.1 versions prior to 18.1R3-S13; 18.2 version 18.2R1 and later versions; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2; 21.2 versions prior to 21.2R1-S1, 21.2R2.
Gravité et risque d'exploitation
CVE-2021-0283 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 0.99 %, ce qui la place devant 62.0 % des CVE référencées.
Que faire ?
- Vérifiez si Junos OS (versions <15.1R7-S10, <18.4R2-S9, 18.4R3-S9, 19.2, <19.4R3-S5, <17.2*, <19.1R3-S6, <20.1R2-S2, 20.1R3-S1, 19.3, 20.1, <19.2R1-S7, 19.2R3-S3, 17.1R1, 21.2, 17.2R1, 20.3, <16.1*, <19.3R2-S7, 19.3R3-S3, <17.4*, 18.3, <17.3R3-S12, 19.1, <20.3R3, 15.1, 20.4, 16.2R1, <21.1R1-S1, 21.1R2, 18.1, 18.2R1, 12.3, <12.3R12-S19, 21.1, 18.4, 17.3, <17.1*, 19.4, <20.4R2-S1, 20.4R3, <18.3R3-S5, 16.1R1, <18.2*, <16.2*, <20.2R3-S2, 20.2, <18.1R3-S13, <21.2R1-S1, 21.2R2, 17.4R1) 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.