PT-2020-4141 · Juniper Networks · Junos Evolved+1

Published 2020-04-08 · Updated 2022-01-01 · CVE-2020-1638

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Junos OS versions prior to 19.2R1-S4, 19.2R2, 19.3R2-S2, 19.3R3, 19.4R1-S1, 19.4R2 Junos OS Evolved versions prior to 19.4R2-EVO

Description: The issue exists due to insufficient input validation in the FPC module of Junos OS and Junos OS Evolved. An attacker can cause a Denial of Service (DoS) condition by continuously sending a specific IPv4 packet, which can restart the FPC and drop all traffic via the FPC. This issue can only occur when processing a specific IPv4 packet and does not affect IPv6 packets.

Recommendations: For Junos OS versions prior to 19.2R1-S4, 19.2R2, update to version 19.2R1-S4 or later. For Junos OS versions prior to 19.3R2-S2, 19.3R3, update to version 19.3R2-S2 or later. For Junos OS versions prior to 19.4R1-S1, 19.4R2, update to version 19.4R1-S1 or later. For Junos OS Evolved versions prior to 19.4R2-EVO, update to version 19.4R2-EVO or later. As a temporary workaround, consider restricting access to the FPC module to minimize the risk of exploitation.

Fix

DoS

RCE

Weakness Enumeration

CWE-467

CWE-20

Related Identifiers

BDU:2020-04563

CVE-2020-1638

Affected Products

Junos

Junos Evolved

References · 6

• https://bdu.fstec.ru/vul/2020-04563 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-1638 · Security Note
• https://kb.juniper.net/JSA11019 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-1638 · Vendor Advisory
• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11019&cat=SIRT_1&actp=LIST · Note
• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11019&cat=SIRT_1&actp=LIST · Note