PT-2021-5290 · Juniper Networks · Junos+1

Published

2021-10-13

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Updated

2022-10-27

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CVE-2021-31359

CVSS v3.1

7.8

High

VectorAV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS versions 15.1 through 15.1R7-S10 Juniper Networks Junos OS versions 17.4 through 17.4R3-S5 Juniper Networks Junos OS versions 18.3 through 18.3R3-S5 Juniper Networks Junos OS versions 18.4 through 18.4R3-S9 Juniper Networks Junos OS versions 19.1 through 19.1R3-S6 Juniper Networks Junos OS versions 19.2 through 19.2R1-S7, 19.2R3-S3 Juniper Networks Junos OS versions 19.3 through 19.3R2-S6, 19.3R3-S3 Juniper Networks Junos OS versions 19.4 through 19.4R3-S6 Juniper Networks Junos OS versions 20.1 through 20.1R2-S2, 20.1R3-S1 Juniper Networks Junos OS versions 20.2 through 20.2R3-S2 Juniper Networks Junos OS versions 20.3 through 20.3R3 Juniper Networks Junos OS versions 20.4 through 20.4R2-S1, 20.4R3 Juniper Networks Junos OS versions 21.1 through 21.1R1-S1, 21.1R2 Juniper Networks Junos OS Evolved versions prior to 20.4R2-S3-EVO Juniper Networks Junos OS Evolved versions 21.1-EVO
Description A local privilege escalation issue in Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged user to cause the Juniper DHCP daemon (jdhcpd) process to crash, resulting in a Denial of Service (DoS), or execute arbitrary commands as root. Continued processing of malicious input will repeatedly crash the system and sustain the Denial of Service (DoS) condition. Systems are only vulnerable if jdhcpd is running.
Recommendations For Juniper Networks Junos OS versions 15.1 through 15.1R7-S10, update to version 15.1R7-S10 or later. For Juniper Networks Junos OS versions 17.4 through 17.4R3-S5, update to version 17.4R3-S5 or later. For Juniper Networks Junos OS versions 18.3 through 18.3R3-S5, update to version 18.3R3-S5 or later. For Juniper Networks Junos OS versions 18.4 through 18.4R3-S9, update to version 18.4R3-S9 or later. For Juniper Networks Junos OS versions 19.1 through 19.1R3-S6, update to version 19.1R3-S6 or later. For Juniper Networks Junos OS versions 19.2 through 19.2R1-S7, 19.2R3-S3, update to version 19.2R1-S7 or 19.2R3-S3 or later. For Juniper Networks Junos OS versions 19.3 through 19.3R2-S6, 19.3R3-S3, update to version 19.3R2-S6 or 19.3R3-S3 or later. For Juniper Networks Junos OS versions 19.4 through 19.4R3-S6, update to version 19.4R3-S6 or later. For Juniper Networks Junos OS versions 20.1 through 20.1R2-S2, 20.1R3-S1, update to version 20.1R2-S2 or 20.1R3-S1 or later. For Juniper Networks Junos OS versions 20.2 through 20.2R3-S2, update to version 20.2R3-S2 or later. For Juniper Networks Junos OS versions 20.3 through 20.3R3, update to version 20.3R3 or later. For Juniper Networks Junos OS versions 20.4 through 20.4R2-S1, 20.4R3, update to version 20.4R2-S1 or 20.4R3 or later. For Juniper Networks Junos OS versions 21.1 through 21.1R1-S1, 21.1R2, update to version 21.1R1-S1 or 21.1R2 or later. For Juniper Networks Junos OS Evolved versions prior to 20.4R2-S3-EVO, update to version 20.4R2-S3-EVO or later. For Juniper Networks Junos OS Evolved versions 21.1-EVO, update to a version that is not 21.1-EVO. As a temporary workaround, consider disabling the jdhcpd process until a patch is available.

Fix

LPE

DoS

Stack Overflow

Improper Privilege Management

Weakness Enumeration

CWE-121CWE-269

Related Identifiers

BDU:2021-06116
CVE-2021-31359

Affected Products

Junos
Junos Evolved