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
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
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
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:
This issue does not affect Juniper Networks Junos OS Evolved versions prior to 19.4R2-EVO.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2021-0292 .
The following software releases have been updated to resolve this specific issue: Junos OS Evolved 19.4R2-S3-EVO, 20.1R2-S4-EVO, 20.3R1-EVO, and all subsequent releases.
This issue is being tracked as 1531154 .
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
2021-07-14: Initial Publication.