PT-2021-12964 · Juniper Networks · Junos

Published 2021-04-22 · Updated 2022-08-05 · CVE-2021-0254

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-S11 Juniper Networks Junos OS versions prior to 17.4R2-S13 Juniper Networks Junos OS versions prior to 17.4R3-S4 Juniper Networks Junos OS versions prior to 18.1R3-S12 Juniper Networks Junos OS versions prior to 18.2R2-S8 Juniper Networks Junos OS versions prior to 18.2R3-S7 Juniper Networks Junos OS versions prior to 18.3R3-S4 Juniper Networks Junos OS versions prior to 18.4R1-S8 Juniper Networks Junos OS versions prior to 18.4R2-S7 Juniper Networks Junos OS versions prior to 18.4R3-S7 Juniper Networks Junos OS versions prior to 19.1R2-S2 Juniper Networks Junos OS versions prior to 19.1R3-S4 Juniper Networks Junos OS versions prior to 19.2R1-S6 Juniper Networks Junos OS versions prior to 19.2R3-S2 Juniper Networks Junos OS versions prior to 19.3R3-S1 Juniper Networks Junos OS versions prior to 19.4R2-S4 Juniper Networks Junos OS versions prior to 19.4R3-S1 Juniper Networks Junos OS versions prior to 20.1R2-S1 Juniper Networks Junos OS versions prior to 20.1R3 Juniper Networks Junos OS versions prior to 20.2R2 Juniper Networks Junos OS versions prior to 20.2R2-S1 Juniper Networks Junos OS versions prior to 20.2R3 Juniper Networks Junos OS versions prior to 20.3R1-S1

Description: A buffer size validation issue in the overlayd service may allow an unauthenticated remote attacker to send specially crafted packets to the device, triggering a partial Denial of Service (DoS) condition, or leading to remote code execution (RCE). The overlayd daemon handles Overlay OAM packets, such as ping and traceroute, sent to the overlay, and runs as root by default, listening for UDP connections on port 4789. This issue results from improper buffer size validation, which can lead to a buffer overflow. Unauthenticated attackers can send specially crafted packets to trigger this issue, resulting in possible remote code execution.

Recommendations: For Juniper Networks Junos OS versions prior to 15.1R7-S9, update to 15.1R7-S9 or later. For Juniper Networks Junos OS versions prior to 17.3R3-S11, update to 17.3R3-S11 or later. For Juniper Networks Junos OS versions prior to 17.4R2-S13, update to 17.4R2-S13 or later. For Juniper Networks Junos OS versions prior to 17.4R3-S4, update to 17.4R3-S4 or later. For Juniper Networks Junos OS versions prior to 18.1R3-S12, update to 18.1R3-S12 or later. For Juniper Networks Junos OS versions prior to 18.2R2-S8, update to 18.2R2-S8 or later. For Juniper Networks Junos OS versions prior to 18.2R3-S7, update to 18.2R3-S7 or later. For Juniper Networks Junos OS versions prior to 18.3R3-S4, update to 18.3R3-S4 or later. For Juniper Networks Junos OS versions prior to 18.4R1-S8, update to 18.4R1-S8 or later. For Juniper Networks Junos OS versions prior to 18.4R2-S7, update to 18.4R2-S7 or later. For Juniper Networks Junos OS versions prior to 18.4R3-S7, update to 18.4R3-S7 or later. For Juniper Networks Junos OS versions prior to 19.1R2-S2, update to 19.1R2-S2 or later. For Juniper Networks Junos OS versions prior to 19.1R3-S4, update to 19.1R3-S4 or later. For Juniper Networks Junos OS versions prior to 19.2R1-S6, update to 19.2R1-S6 or later. For Juniper Networks Junos OS versions prior to 19.2R3-S2, update to 19.2R3-S2 or later. For Juniper Networks Junos OS versions prior to 19.3R3-S1, update to 19.3R3-S1 or later. For Juniper Networks Junos OS versions prior to 19.4R2-S4, update to 19.4R2-S4 or later. For Juniper Networks Junos OS versions prior to 19.4R3-S1, update to 19.4R3-S1 or later. For Juniper Networks Junos OS versions prior to 20.1R2-S1, update to 20.1R2-S1 or later. For Juniper Networks Junos OS versions prior to 20.1R3, update to 20.1R3 or later. For Juniper Networks Junos OS versions prior to 20.2R2, update to 20.2R2 or later. For Juniper Networks Junos OS versions prior to 20.2R2-S1, update to 20.2R2-S1 or later. For Juniper Networks Junos OS versions prior to 20.2R3, update to 20.2R3 or later. For Juniper Networks Junos OS versions prior to 20.3R1-S1, update to 20.3R1-S1 or later.

Fix

DoS

RCE

Memory Corruption

Weakness Enumeration

CWE-787

CWE-131

Related Identifiers

CVE-2021-0254

Affected Products

Junos

References · 3

• https://osv.dev/vulnerability/CVE-2021-0254 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-0254 · Security Note
• https://kb.juniper.net/JSA11147 · Vendor Advisory