CVE-2023-42669
Samba: "rpcecho" development server allows denial of service via sleep() call on ad dc
At a glance
- Severity
- MEDIUM 6.5
- EPSS
- EPSS 1.94 % · percentile 80 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Modified
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | redhat |
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2023-47101
- GCVE · GCVE-0-2023-42669
CERT-FR advisories
- CERTFR-2025-AVI-0969 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0309 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0506 — Multiples vulnérabilités dans Juniper Secure Analytics · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0423 — Multiples vulnérabilités dans les produits NetApp · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0305 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0262 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2023-AVI-1011 — Multiples vulnérabilités dans les produits Qnap · cert.ssi.gouv.fr
- CERTFR-2023-AVI-0831 — Multiples vulnérabilités dans Samba · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*≥ 4.0.0 < 4.17.12cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*≥ 4.18.0 < 4.18.8cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*≥ 4.19.0 < 4.19.1cpe:2.3:a:redhat:storage:3.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_eus:9.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:9.0_s390x:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:9.0_ppc64le:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| samba | affected 4.0.0 < 4.17.12 ; affected 4.18.0 < 4.18.8 ; affected 4.19.0 |
| Red Hat · Red Hat Enterprise Linux 8 | unaffected 0:4.18.6-2.el8_9 < * |
| Red Hat · Red Hat Enterprise Linux 8 | unaffected 0:4.18.6-2.el8_9 < * |
| Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support | unaffected 0:4.15.5-13.el8_6 < * |
| Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support | unaffected 0:4.17.5-4.el8_8 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:4.18.6-101.el9_3 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:4.18.6-101.el9_3 < * |
| Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support | unaffected 0:4.15.5-111.el9_0 < * |
| Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support | unaffected 0:4.17.5-104.el9_2 < * |
| Red Hat · Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | unaffected 0:4.15.5-13.el8_6 < * |
| Red Hat · Red Hat Enterprise Linux 6 | |
| Red Hat · Red Hat Enterprise Linux 6 | |
| Red Hat · Red Hat Enterprise Linux 7 | |
| Red Hat · Red Hat Storage 3 |
References
- https://access.redhat.com/errata/RHSA-2023:6209
- https://access.redhat.com/errata/RHSA-2023:6744
- https://access.redhat.com/errata/RHSA-2023:7371
- https://access.redhat.com/errata/RHSA-2023:7408
- https://access.redhat.com/errata/RHSA-2023:7464
- https://access.redhat.com/errata/RHSA-2023:7467
- https://access.redhat.com/security/cve/CVE-2023-42669
- https://bugzilla.redhat.com/show_bug.cgi?id=2241884
- https://bugzilla.samba.org/show_bug.cgi?id=15474
- https://www.samba.org/samba/security/CVE-2023-42669.html
- https://security.netapp.com/advisory/ntap-20231124-0002/
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |