// For flags

CVE-2021-0292

Junos OS Evolved: Memory leak in arpd or ndp processes can lead to Denial of Service (DoS)

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An Uncontrolled Resource Consumption vulnerability in the ARP daemon (arpd) and Network Discovery Protocol (ndp) process of Juniper Networks Junos OS Evolved allows a malicious attacker on the local network to consume memory resources, ultimately resulting in a Denial of Service (DoS) condition. Link-layer functions such as IPv4 and/or IPv6 address resolution may be impacted, leading to traffic loss. The processes do not recover on their own and must be manually restarted. Changes in memory usage can be monitored using the following shell commands (header shown for clarity): user@router:/var/log# ps aux | grep arpd USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 31418 59.0 0.7 *5702564* 247952 ? xxx /usr/sbin/arpd --app-name arpd -I object_select --shared-objects-mode 3 user@router:/var/log# ps aux | grep arpd USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 31418 49.1 1.0 *5813156* 351184 ? xxx /usr/sbin/arpd --app-name arpd -I object_select --shared-objects-mode 3 Memory usage can be monitored for the ndp process in a similar fashion: user@router:/var/log# ps aux | grep ndp USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 14935 0.0 0.1 *5614052* 27256 ? Ssl Jun15 0:17 /usr/sbin/ndp -I no_tab_chk,object_select --app-name ndp --shared-obje user@router:/var/log# ps aux | grep ndp USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 14935 0.0 0.1 *5725164* 27256 ? Ssl Jun15 0:17 /usr/sbin/ndp -I no_tab_chk,object_select --app-name ndp --shared-obje This issue affects Juniper Networks Junos OS Evolved: 19.4 versions prior to 19.4R2-S3-EVO; 20.1 versions prior to 20.1R2-S4-EVO; all versions of 20.2-EVO. This issue does not affect Juniper Networks Junos OS Evolved versions prior to 19.4R2-EVO.

Una vulnerabilidad de Consumo No Controlado de Recursos en el demonio ARP (arpd) y el proceso Network Discovery Protocol (ndp) de Juniper Networks Junos OS Evolved permite a un atacante malicioso en la red local consumir recursos de memoria, Resultando últimamente en una condición de Denegación de Servicio (DoS). Unas funciones de la capa de enlace, como la resolución de direcciones IPv4 y/o IPv6, pueden estar impactadas, conllevando a una pérdida de tráfico. Los procesos no se recuperan por sí solos y deben ser reiniciados manualmente. Los cambios en el uso de la memoria pueden ser monitoreados usando los siguientes comandos del shell (se muestra el encabezado para mayor claridad): user@router:/var/log# ps aux | grep arpd USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 31418 59. 0 0.7 *5702564* 247952 ? xxx /usr/sbin/arpd --app-name arpd -I object_select --shared-objects-mode 3 user@router:/var/log# ps aux | grep arpd USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 31418 49. 1 1.0 *5813156* 351184 ? xxx /usr/sbin/arpd --app-name arpd -I object_select --shared-objects-mode 3 El uso de la memoria puede monitorizarse para el proceso ndp de forma similar: user@router:/var/log# ps aux | grep ndp USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 14935 0.0 0.1 *5614052* 27256 ? Ssl Jun15 0:17 /usr/sbin/ndp -I no_tab_chk,object_select --app-name ndp --shared-obje user@router:/var/log# ps aux | grep ndp USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 14935 0.0 0.1 *5725164* 27256 ? Ssl Jun15 0:17 /usr/sbin/ndp -I no_tab_chk,object_select --app-name ndp --shared-obje Este problema afecta a Juniper Networks Junos OS Evolved: Las versiones 19.4 anteriores a 19.4R2-S3-EVO; las versiones 20.1 anteriores a 20.1R2-S4-EVO; todas las versiones de 20.2-EVO. Este problema no afecta a las versiones de Juniper Networks Junos OS Evolved anteriores a 19.4R2-EVO

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-10-27 CVE Reserved
  • 2021-07-15 CVE Published
  • 2024-03-29 EPSS Updated
  • 2024-09-16 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
References (1)
URL Tag Source
URL Date SRC
URL Date SRC
URL Date SRC
https://kb.juniper.net/JSA11194 2021-10-25
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Juniper
Search vendor "Juniper"
Junos Os Evolved
Search vendor "Juniper" for product "Junos Os Evolved"
19.4
Search vendor "Juniper" for product "Junos Os Evolved" and version "19.4"
r1
Affected
Juniper
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Junos Os Evolved
Search vendor "Juniper" for product "Junos Os Evolved"
19.4
Search vendor "Juniper" for product "Junos Os Evolved" and version "19.4"
r2
Affected
Juniper
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Junos Os Evolved
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19.4
Search vendor "Juniper" for product "Junos Os Evolved" and version "19.4"
r2-s1
Affected
Juniper
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Junos Os Evolved
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19.4
Search vendor "Juniper" for product "Junos Os Evolved" and version "19.4"
r2-s2
Affected
Juniper
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Junos Os Evolved
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20.1
Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"
-
Affected
Juniper
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Junos Os Evolved
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20.1
Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"
r1
Affected
Juniper
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Junos Os Evolved
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20.1
Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"
r1-s1
Affected
Juniper
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Junos Os Evolved
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20.1
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r2
Affected
Juniper
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Junos Os Evolved
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20.1
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r2-s1
Affected
Juniper
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Junos Os Evolved
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20.1
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r2-s2
Affected
Juniper
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Junos Os Evolved
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20.1
Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"
r2-s3
Affected
Juniper
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Junos Os Evolved
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20.2
Search vendor "Juniper" for product "Junos Os Evolved" and version "20.2"
-
Affected