PT-2021-5607 · Juniper Networks · Junos

Andy Coles · Published 2021-10-19 · Updated 2021-10-25 · CVE-2021-31372

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS versions prior to 18.3R3-S5 Juniper Networks Junos OS 18.4 versions prior to 18.4R3-S9 Juniper Networks Junos OS 19.1 versions prior to 19.1R3-S6 Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S3 Juniper Networks Junos OS 19.3 versions prior to 19.3R3-S3 Juniper Networks Junos OS 19.4 versions prior to 19.4R3-S5 Juniper Networks Junos OS 20.1 versions prior to 20.1R3-S1 Juniper Networks Junos OS 20.2 versions prior to 20.2R3-S2 Juniper Networks Junos OS 20.3 versions prior to 20.3R3-S1 Juniper Networks Junos OS 20.4 versions prior to 20.4R3 Juniper Networks Junos OS 21.1 versions prior to 21.1R2, 21.1R3 Juniper Networks Junos OS 21.2 versions prior to 21.2R1-S1, 21.2R2

Description The issue is related to an improper input validation vulnerability in the J-Web interface of Juniper Networks Junos OS. This vulnerability allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device.

Recommendations For Juniper Networks Junos OS versions prior to 18.3R3-S5, update to version 18.3R3-S5 or later. For Juniper Networks Junos OS 18.4 versions prior to 18.4R3-S9, update to version 18.4R3-S9 or later. For Juniper Networks Junos OS 19.1 versions prior to 19.1R3-S6, update to version 19.1R3-S6 or later. For Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S3, update to version 19.2R3-S3 or later. For Juniper Networks Junos OS 19.3 versions prior to 19.3R3-S3, update to version 19.3R3-S3 or later. For Juniper Networks Junos OS 19.4 versions prior to 19.4R3-S5, update to version 19.4R3-S5 or later. For Juniper Networks Junos OS 20.1 versions prior to 20.1R3-S1, update to version 20.1R3-S1 or later. For Juniper Networks Junos OS 20.2 versions prior to 20.2R3-S2, update to version 20.2R3-S2 or later. For Juniper Networks Junos OS 20.3 versions prior to 20.3R3-S1, update to version 20.3R3-S1 or later. For Juniper Networks Junos OS 20.4 versions prior to 20.4R3, update to version 20.4R3 or later. For Juniper Networks Junos OS 21.1 versions prior to 21.1R2, 21.1R3, update to version 21.1R2 or 21.1R3 or later. For Juniper Networks Junos OS 21.2 versions prior to 21.2R1-S1, 21.2R2, update to version 21.2R1-S1 or 21.2R2 or later.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2022-00041

CVE-2021-31372

Affected Products

Junos

References · 6

• https://bdu.fstec.ru/vul/2022-00041 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-31372 · Security Note
• https://kb.juniper.net/JSA11237 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31372 · Vendor Advisory
• https://kb.juniper.net/InfoCenter/index?pagecontentidJSA11237catSIRT1actpLISTshowDraftfalse · Note
• https://t.me/cibsecurity/30822 · Telegram Post