CVE-2023-42669Medium· 6.5▾ SunlitA vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises bec…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 35.8 · likelihood 0.4 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
1.9%
A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in the main RPC task, allowing calls to the "rpcecho" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a "sleep()" call in the "dcesrv_echo_TestSleep()" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the "rpcecho" server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as "rpcecho" runs in the main RPC task.
samba >= 4.0.0 < 4.17.12samba >= 4.18.0 < 4.18.8samba 4.19.0samba (all versions)samba (all versions)samba (all versions)samba (all versions)samba (all versions)samba (all versions)samba (all versions)samba (all versions)samba (all versions)sambasamba4sambasambaRefer to the linked advisories for vendor-supplied fixes and affected version ranges.
To mitigate this vulnerability, disable rpcecho service on the AD DC by setting:
dcerpc endpoint servers = -rpcecho
Connected by shared product, vendor, weakness, or advisory.
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