PT-2021-19265 · Juniper Networks · Junos

Published 2021-10-19 · Updated 2021-10-25 · CVE-2021-31366

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS versions prior to 15.1R7-S9 Juniper Networks Junos OS versions prior to 17.3R3-S12 Juniper Networks Junos OS versions prior to 17.4R3-S5 Juniper Networks Junos OS versions prior to 18.1R3-S13 Juniper Networks Junos OS versions prior to 18.2R3-S8 Juniper Networks Junos OS versions prior to 18.3R3-S5 Juniper Networks Junos OS versions prior to 18.4R3-S9 Juniper Networks Junos OS versions prior to 19.1R3-S6 Juniper Networks Junos OS versions prior to 19.2R1-S7 Juniper Networks Junos OS versions prior to 19.2R3-S3 Juniper Networks Junos OS versions prior to 19.3R2-S6 Juniper Networks Junos OS versions prior to 19.3R3-S3 Juniper Networks Junos OS versions prior to 19.4R3-S3 Juniper Networks Junos OS versions prior to 20.1R3 Juniper Networks Junos OS versions prior to 20.2R3-S1 Juniper Networks Junos OS versions prior to 20.3R3 Juniper Networks Junos OS versions prior to 20.4R3 Juniper Networks Junos OS versions prior to 21.1R2

Description An Unchecked Return Value vulnerability in the authd (authentication daemon) of Juniper Networks Junos OS on MX Series configured for subscriber management / BBE allows an adjacent attacker to cause a crash by sending a specific username. This impacts authentication, authorization, and accounting (AAA) services on the MX devices and leads to a Denial of Service (DoS) condition. Continued receipt of these PPP login requests will create a sustained Denial of Service (DoS) condition.

Recommendations For Juniper Networks Junos OS versions prior to 15.1R7-S9, update to version 15.1R7-S9 or later. For Juniper Networks Junos OS versions prior to 17.3R3-S12, update to version 17.3R3-S12 or later. For Juniper Networks Junos OS versions prior to 17.4R3-S5, update to version 17.4R3-S5 or later. For Juniper Networks Junos OS versions prior to 18.1R3-S13, update to version 18.1R3-S13 or later. For Juniper Networks Junos OS versions prior to 18.2R3-S8, update to version 18.2R3-S8 or later. For Juniper Networks Junos OS versions prior to 18.3R3-S5, update to version 18.3R3-S5 or later. For Juniper Networks Junos OS versions prior to 18.4R3-S9, update to version 18.4R3-S9 or later. For Juniper Networks Junos OS versions prior to 19.1R3-S6, update to version 19.1R3-S6 or later. For Juniper Networks Junos OS versions prior to 19.2R1-S7, update to version 19.2R1-S7 or later. For Juniper Networks Junos OS versions prior to 19.2R3-S3, update to version 19.2R3-S3 or later. For Juniper Networks Junos OS versions prior to 19.3R2-S6, update to version 19.3R2-S6 or later. For Juniper Networks Junos OS versions prior to 19.3R3-S3, update to version 19.3R3-S3 or later. For Juniper Networks Junos OS versions prior to 19.4R3-S3, update to version 19.4R3-S3 or later. For Juniper Networks Junos OS versions prior to 20.1R3, update to version 20.1R3 or later. For Juniper Networks Junos OS versions prior to 20.2R3-S1, update to version 20.2R3-S1 or later. For Juniper Networks Junos OS versions prior to 20.3R3, update to version 20.3R3 or later. For Juniper Networks Junos OS versions prior to 20.4R3, update to version 20.4R3 or later. For Juniper Networks Junos OS versions prior to 21.1R2, update to version 21.1R2 or later.

Fix

DoS

Unchecked Return Value

Weakness Enumeration

CWE-252

Related Identifiers

CVE-2021-31366

Affected Products

Junos

References · 4

• https://kb.juniper.net/JSA11228 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-31366 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31366 · Vendor Advisory
• https://t.me/cibsecurity/30818 · Telegram Post