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Vulnerability · Published Nov 3, 2023 · Assigned by redhat

CVE-2023-42670Samba: ad dc busy rpc multiple listener dos

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in samba. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)1.3%top 29.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Samba. It is susceptible to a vulnerability where multiple incompatible RPC listeners can be initiated, causing disruptions in the AD DC service. When Samba's RPC server experiences a high load or unresponsiveness, servers intended for non-AD DC purposes (for example, NT4-emulation "classic DCs") can erroneously start and compete for the same unix domain sockets. This issue leads to partial query responses from the AD DC, causing issues such as "The procedure number is out of range" when using tools like Active Directory Users. This flaw allows an attacker to disrupt AD DC services.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20samba4.18.8-r0ALPINE-CVE-2023-42670
Alpine:v3.21samba4.18.8-r0ALPINE-CVE-2023-42670
Alpine:v3.22samba4.18.8-r0ALPINE-CVE-2023-42670
Alpine:v3.23samba4.18.8-r0ALPINE-CVE-2023-42670
Alpine:v3.24samba4.18.8-r0ALPINE-CVE-2023-42670
Debian:12samba2:4.17.12+dfsg-0+deb12u1DSA-5525-1
Debian:12samba2:4.17.12+dfsg-0+deb12u1DEBIAN-CVE-2023-42670
Debian:13samba2:4.19.1+dfsg-1DEBIAN-CVE-2023-42670
Debian:14samba2:4.19.1+dfsg-1DEBIAN-CVE-2023-42670
Ubuntu:22.04:LTSsamba2:4.15.13+dfsg-0ubuntu1.5UBUNTU-CVE-2023-42670
Ubuntu:22.04:LTSsamba2:4.15.13+dfsg-0ubuntu1.5USN-6425-1

Affected products (as reported)

VendorProductVersions
samba 4.16.0 – before 4.17.124.18.0 – before 4.18.84.19.0
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Storage 3 see references

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References