CVE-2023-22496

Netdata is an open source option for real-time infrastructure monitoring
and troubleshooting. An attacker with the ability to establish a streaming
connection can execute arbitrary commands on the targeted Netdata agent.
When an alert is triggered, the function health_alarm_execute is called.
This function performs different checks and then enqueues a command by
calling spawn_enq_cmd. This command is populated with several arguments
that are not sanitized. One of them is the registry_hostname of the node
for which the alert is raised. By providing a specially crafted
registry_hostname as part of the health data that is streamed to a
Netdata (parent) agent, an attacker can execute arbitrary commands at the
remote host as a side-effect of the raised alert. Note that the commands
are executed as the user running the Netdata Agent. This user is usually
named netdata. The ability to run arbitrary commands may allow an
attacker to escalate privileges by escalating other vulnerabilities in the
system, as that user. The problem has been fixed in: Netdata agent v1.37
(stable) and Netdata agent v1.36.0-409 (nightly). As a workaround,
streaming is not enabled by default. If you have previously enabled this,
it can be disabled. Limiting access to the port on the recipient Agent to
trusted child connections may mitigate the impact of this vulnerability.