CVE-2023-42669 Information

Description

A vulnerability was found in Samba’s pcecho\ 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 pcecho\ service operates with only one worker in the main RPC task allowing calls to the pcecho\ 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 pcecho\ 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 pcecho\ runs in the main RPC task.

Reference

https://bugzilla.samba.org/show_bug.cgi?id=15474 https://www.samba.org/samba/security/CVE-2023-42669.html https://bugzilla.redhat.com/show_bug.cgi?id=2241884 https://access.redhat.com/security/cve/CVE-2023-42669 https://access.redhat.com/errata/RHSA-2023:6209 https://access.redhat.com/errata/RHSA-2023:6744