7.5High

CVE-2023-34966Samba: infinite loop in mdssvc rpc service for spotlight

Red Hat Red Hat Enterprise Linux 8; Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support;… Published: 2023-07-20 17:56 (3 years ago)

Description

An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.

Weakness (CWE): CWE-835

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

Vendor	Product	Versions
debian	debian linux	11.0
enterprise linux	8	—
enterprise linux	9	—
fedoraproject	fedora	37
redhat	enterprise linux	8.0
Red Hat	Red Hat Enterprise Linux 6	—
Red Hat	Red Hat Enterprise Linux 7	—
Red Hat	Red Hat Enterprise Linux 8	all versions
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support	all versions
Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support	all versions
Red Hat	Red Hat Enterprise Linux 9	all versions
Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support	all versions
Red Hat	Red Hat Storage 3	—
Red Hat	Red Hat Virtualization 4 for Red Hat Enterprise Linux 8	all versions
rhel eus	8.6	—
rhel eus	8.8	—
rhel eus	9.2	—
rhev hypervisor	4.4	—
samba	samba	< 4.16.11

References and patches

RHSA-2023:6667 vendor-advisoryThird Party Advisory
RHSA-2023:7139 vendor-advisoryThird Party Advisory
RHSA-2024:0423 vendor-advisory
RHSA-2024:0580 vendor-advisory
RHSA-2024:4101 vendor-advisory
https://access.redhat.com/security/cve/CVE-2023-34966 vdb-entryThird Party Advisory
RHBZ#2222793 issue-trackingIssue TrackingThird Party Advisory
https://www.samba.org/samba/security/CVE-2023-34966 Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPCSGND7LO467A…
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OT74M42E6C36W7…
https://security.netapp.com/advisory/ntap-20230731-0010/
https://www.debian.org/security/2023/dsa-5477

CPE matches (NVD) (9)

cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* < 4.16.11
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* ≥ 4.17.0 < 4.17.10
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* ≥ 4.18.0 < 4.18.5
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*

CVSS score

7.5High

Source: redhat · CVSS 3.1

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

All scores (3)

cna	CVSS 3.1	7.5High
secalert@redhat.com	CVSS 3.1	7.5High
nvd	CVSS 3.1	7.5High

EPSS (chance of exploitation in 30 days)

62.40%

higher than 99% of all CVEs

Timeline

ID reserved2023-06-07
Published2023-07-20 17:56
Reached IP-DB2026-10-24 23:53
Last updated2026-11-07 10:16

Assigned by (CNA): redhat
NVD status: Modified

View at source: CVE.org · NVD

Get told when these products get a new vulnerability

Turn on email alerts

Free · with an account · switch off any time

Recent CVEs in the same product — Debian

9.2Critical

CVE-2026-111497 KEV 24 days ago

Out-of-Bounds Write in Google Brotli Decoder

Google Brotli; Siemens Calibre; Siemens Calibre ICE; Siemens Capital

A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause …

83%EPSS

8.4High

CVE-2026-77118 2 months ago

Out-of-bounds write in GraphicsMagick PCD decoder

GraphicsMagick Group GraphicsMagick; Debian graphicsmagick; Fedora Project GraphicsMagick

A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated…

6.0Medium

CVE-2026-12996 3 months ago

OpenVPN OpenVPN

A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote authenticated peers to potentially cause a denial of service or leak memory via crafted packets during TLS session promotion or expiry

5.6Medium

CVE-2026-14355 4 months ago

ext/openssl: Memory corruption in openssl_encrypt with AES-WRAP-PAD

php php

In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRAP-PAD algorithm implementation in OpenSSL extension contains a buffer allocation flaw. The output buffer for the AES key-wrap-with-padding operation …

3.7Low

CVE-2026-56968 4 months ago

GNU GNU SASL

GNU SASL before 2.2.4 lacks sanitization of a short challenge in _gsasl_ntlm_client_step in the NTLM client, which could result in memory disclosure via a crafted server.

7.5High

CVE-2026-49975 5 months ago

Apache HTTP Server: mod_http2 denial of service

Apache Software Foundation Apache HTTP Server; Red Hat JBoss Core Services for RHEL 8; Red Hat JBoss Core Services on RHEL 7; Red Hat Red Hat Enterprise Linux 10

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

33%EPSS