PT-2021-19263 · Juniper Networks · Junos

Published 2021-10-19 · Updated 2021-10-27 · CVE-2021-31364

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 versions prior to 17.4R3-S5 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 18.3 versions prior to 18.3R3-S5 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 18.4 versions prior to 18.4R3-S9 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 19.1 versions prior to 19.1R3-S6 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 19.2 versions prior to 19.2R1-S7, 19.2R3-S2 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 19.3 versions prior to 19.3R2-S6, 19.3R3-S2 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 19.4 versions prior to 19.4R1-S4, 19.4R3-S3 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 20.1 versions prior to 20.1R2-S2, 20.1R3 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 20.2 versions prior to 20.2R3 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 20.3 versions prior to 20.3R2-S1, 20.3R3 Juniper Networks Junos OS SRX300 Series, SRX500 Series, SRX1500, and SRX5000 Series with SPC2 20.4 versions prior to 20.4R2

Description An Improper Check for Unusual or Exceptional Conditions vulnerability combined with a Race Condition in the flow daemon (flowd) of Juniper Networks Junos OS allows an unauthenticated network-based attacker sending specific traffic to cause a crash of the flowd/srxpfe process, responsible for traffic forwarding in SRX, which will cause a Denial of Service (DoS). Continued receipt and processing of this specific traffic will create a sustained Denial of Service (DoS) condition. This issue can only occur when specific packets are trying to create the same session and logging for session-close is configured as a policy action.

Recommendations For versions prior to 17.4R3-S5, update to 17.4R3-S5 or later. For 18.3 versions prior to 18.3R3-S5, update to 18.3R3-S5 or later. For 18.4 versions prior to 18.4R3-S9, update to 18.4R3-S9 or later. For 19.1 versions prior to 19.1R3-S6, update to 19.1R3-S6 or later. For 19.2 versions prior to 19.2R1-S7, 19.2R3-S2, update to 19.2R1-S7, 19.2R3-S2 or later. For 19.3 versions prior to 19.3R2-S6, 19.3R3-S2, update to 19.3R2-S6, 19.3R3-S2 or later. For 19.4 versions prior to 19.4R1-S4, 19.4R3-S3, update to 19.4R1-S4, 19.4R3-S3 or later. For 20.1 versions prior to 20.1R2-S2, 20.1R3, update to 20.1R2-S2, 20.1R3 or later. For 20.2 versions prior to 20.2R3, update to 20.2R3 or later. For 20.3 versions prior to 20.3R2-S1, 20.3R3, update to 20.3R2-S1, 20.3R3 or later. For 20.4 versions prior to 20.4R2, update to 20.4R2 or later.

Fix

DoS

Improper Check for Exceptional Conditions

Race Condition

Weakness Enumeration

CWE-754

CWE-362

Related Identifiers

CVE-2021-31364

Affected Products

Junos

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2021-31364 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31364 · Vendor Advisory
• https://kb.juniper.net/JSA11226 · Vendor Advisory
• https://t.me/cibsecurity/30828 · Telegram Post