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.
Do you have additional information related to this advisory?
Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this
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Subject: Chrony Denial of Service Security Issue and Vulnerability
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