CVE-2023-42669

Advisory lineage Upstream: 0 Downstream: 16
Modified
Published: 06 Nov 2023, 06:57
Last modified:20 Nov 2025, 18:28

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
v3.1 (cve.org)
EPSS Score
0.58% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 Nov 2023, 06:57
Published
Vulnerability first disclosed
20 Nov 2025, 18:28
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.58%• Percentile: 69%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • redhat•enterprise_linux

    8.0 | 9.0

  • redhat•enterprise_linux_eus

    9.0

  • redhat•enterprise_linux_for_ibm_z_systems

    9.0_s390x

  • redhat•enterprise_linux_for_ibm_z_systems_eus

    9.0_s390x

  • redhat•enterprise_linux_for_power_little_endian

    9.0_ppc64le

  • redhat•enterprise_linux_for_power_little_endian_eus

    9.0_ppc64le

  • redhat•storage

    3.0

  • samba•samba

    ≥ 4.0.0, < 4.17.12 | ≥ 4.18.0, < 4.18.8 | ≥ 4.19.0, < 4.19.1

References (11)