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CVE-2023-42669

A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements.

Impact

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.

Affected products

VendorProductAffected versions
SambaSamba
from 4.0.0 before 4.17.12
from 4.18.0 before 4.18.8
from 4.19.0 before 4.19.1
RedhatStorage
Version 3.0
RedhatEnterprise Linux
Versions 8.0, 9.0
RedhatEnterprise Linux Eus
Version 9.0
RedhatEnterprise Linux For Ibm Z Systems
Version 9.0_s390x
RedhatEnterprise Linux For Ibm Z Systems Eus
Version 9.0_s390x
RedhatEnterprise Linux For Power Little Endian
Version 9.0_ppc64le
RedhatEnterprise Linux For Power Little Endian Eus
Version 9.0_ppc64le

Weakness classification

CWE-400

References