CVE-2020-1653 Information

Description

On Juniper Networks Junos OS devices a stream of TCP packets sent to the Routing Engine (RE) may cause mbuf leak which can lead to Flexible PIC Concentrator (FPC) crash or the system to crash and restart (vmcore). This issue can be trigged by IPv4 or IPv6 and it is caused only by TCP packets. This issue is not related to any specific configuration and it affects Junos OS releases starting from 17.4R1. However this issue does not affect Junos OS releases prior to 18.2R1 when Nonstop active routing (NSR) is configured [edit routing-options nonstop-routing]. The number of mbufs is platform dependent. The following command provides the number of mbufs counter that are currently in use and maximum number of mbufs that can be allocated on a platform: user@host show system buffers 2437/3143/5580 mbufs in use (current/cache/total) Once the device runs out of mbufs the FPC crashes or the vmcore occurs and the device might become inaccessible requiring a manual restart. This issue affects Juniper Networks Junos OS 17.4 versions prior to 17.4R2-S11 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7 18.2R3-S5; 18.2X75 versions prior to 18.2X75-D41 18.2X75-D420.12 18.2X75-D51 18.2X75-D60 18.2X75-D34; 18.3 versions prior to 18.3R2-S4 18.3R3-S2; 18.4 versions prior to 18.4R1-S7 18.4R2-S4 18.4R3-S1; 19.1 versions prior to 19.1R1-S5 19.1R2-S1 19.1R3; 19.2 versions prior to 19.2R1-S5 19.2R2; 19.3 versions prior to 19.3R2-S3 19.3R3; 19.4 versions prior to 19.4R1-S2 19.4R2. Versions of Junos OS prior to 17.4R1 are unaffected by this vulnerability.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://kb.juniper.net/JSA11040

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5