Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Network
0

CVE-2023-42669

Disclosure Date: November 06, 2023 •
CVE-2023-42669 CVSS v3 Base Score: 6.5
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Description

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.

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CVSS V3 Severity and Metrics
Base Score:
6.5 Medium
Impact Score:
3.6
Exploitability Score:
2.8
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Red Hat Enterprise Linux 8 not down converted
Red Hat Enterprise Linux 8 not down converted
Red Hat Enterprise Linux 8.6 Extended Update Support not down converted
Red Hat Enterprise Linux 8.8 Extended Update Support not down converted
Red Hat Enterprise Linux 9 not down converted
Red Hat Enterprise Linux 9 not down converted
Red Hat Enterprise Linux 9.0 Extended Update Support not down converted
Red Hat Enterprise Linux 9.2 Extended Update Support not down converted
Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 not down converted
Red Hat Enterprise Linux 6 not down converted
Red Hat Enterprise Linux 6 not down converted
Red Hat Enterprise Linux 7 not down converted
Red Hat Storage 3 not down converted
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • redhat,
  • samba

Products

  • enterprise linux 8.0,
  • enterprise linux 9.0,
  • enterprise linux eus 9.0,
  • enterprise linux for ibm z systems 9.0 s390x,
  • enterprise linux for ibm z systems eus 9.0 s390x,
  • enterprise linux for power little endian 9.0 ppc64le,
  • enterprise linux for power little endian eus 9.0 ppc64le,
  • samba,
  • storage 3.0
Technical Analysis