CVE-2023-42669

Summary

CVE-2023-42669 is a vulnerability affecting Samba's "rpcecho" development server, a non-Windows RPC server used for testing Samba's DCE/RPC stack elements. An RPC function in the "rpcecho" service can be manipulated to cause indefinite blocking, leading to service disruptions. This issue stems from the fact that the "rpcecho" service operates with only one worker in the main RPC task, making it susceptible to denial-of-service (DoS) attacks. Authenticated users or attackers can exploit this vulnerability by calling the "rpcecho" server and requesting it to sleep for a specified duration, effectively disrupting most services and causing a complete denial of service on the Active Directory Domain Controller. The DoS impact extends to all other services as the "rpcecho" runs in the main RPC task.

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