CVE-2018-0031

Description

Receipt of specially crafted UDP/IP packets over MPLS may be able to bypass a stateless firewall filter. The crafted UDP packets must be encapsulated and meet a very specific packet format to be classified in a way that bypasses IP firewall filter rules. The packets themselves do not cause a service interruption (e.g. RPD crash), but receipt of a high rate of UDP packets may be able to contribute to a denial of service attack. This issue only affects processing of transit UDP/IP packets over MPLS, received on an interface with MPLS enabled. TCP packet processing and non-MPLS encapsulated UDP packet processing are unaffected by this issue. Affected releases are Juniper Networks Junos OS: 12.1X46 versions prior to 12.1X46-D76; 12.3 versions prior to 12.3R12-S10; 12.3X48 versions prior to 12.3X48-D66, 12.3X48-D70; 14.1X53 versions prior to 14.1X53-D47; 15.1 versions prior to 15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7; 15.1X49 versions prior to 15.1X49-D131, 15.1X49-D140; 15.1X53 versions prior to 15.1X53-D59 on EX2300/EX3400; 15.1X53 versions prior to 15.1X53-D67 on QFX10K; 15.1X53 versions prior to 15.1X53-D233 on QFX5200/QFX5110; 15.1X53 versions prior to 15.1X53-D471, 15.1X53-D490 on NFX; 16.1 versions prior to 16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7; 16.2 versions prior to 16.2R1-S6, 16.2R2-S5, 16.2R3; 17.1 versions prior to 17.1R1-S7, 17.1R2-S7, 17.1R3; 17.2 versions prior to 17.2R1-S6, 17.2R2-S4, 17.2R3; 17.2X75 versions prior to 17.2X75-D100; 17.3 versions prior to 17.3R1-S4, 17.3R2-S2, 17.3R3; 17.4 versions prior to 17.4R1-S3, 17.4R2; 18.1 versions prior to 18.1R2; 18.2X75 versions prior to 18.2X75-D5.

Gravité et risque d'exploitation

CVE-2018-0031 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 1.22 %, ce qui la place devant 68.1 % des CVE référencées.

Que faire ?

• Vérifiez si Junos OS (versions <12.3X48-D66, 12.3X48-D70, 16.1, <17.4R1-S3, 17.4R2, 17.2X75, <15.1F6-S10, 15.1R4-S9, 15.1R6-S6, 15.1R7, <18.2X75-D5, <16.1R3-S8, 16.1R4-S9, 16.1R5-S4, 16.1R6-S3, 16.1R7, 15.1X49, 14.1X53, 16.2, <18.1R2, <15.1X53-D67, <15.1X53-D233, <16.2R1-S6, 16.2R2-S5, 16.2R3, 15.1, 17.1, 18.1, 17.4, 12.3, <12.1X46-D76, 15.1X53, 17.3, <17.2X75-D100, 18.2X75, <15.1X53-D59, <15.1X49-D131, 15.1X49-D140, <15.1X53-D471, 15.1X53-D490, 12.3X48, <12.3R12-S10, <14.1X53-D47, <17.2R1-S6, 17.2R2-S4, 17.2R3, 17.2, <17.3R1-S4, 17.3R2-S2, 17.3R3, <17.1R1-S7, 17.1R2-S7, 17.1R3, 12.1X46) 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.juniper.net/JSA10865
• http://www.securitytracker.com/id/1041326