A security issue and a vulnerability have been reported in Chrony, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) A vulnerability is caused due to an error within the processing of "cmdmon" packets, which can be exploited to cause a packet reply loop by sending a specially crafted packet with a spoofed source IP address to an affected Chrony server.
2) A security issue is caused due to the logging facility not properly limiting the amount of memory used to store client information. This can be exploited to cause a DoS due to memory exhaustion by sending a large number of spoofed NTP or "cmdmon" packets.
Successful exploitation requires that chronyd allows access from a wide range of IP addresses (restricted to 127.0.0.1 by default).
NOTE: Additionally, chronyd does not limit the rate for log messages, which can be used to fill up the disk space.
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Subject: Chrony Denial of Service Security Issue and Vulnerability
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