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Critical Samba RCE Vulnerability Enables Arbitrary Code Execution

A critical remote code execution (RCE) vulnerability has been identified in Samba, potentially enabling attackers to compromise Active Directory domain controllers . This vulnerability, tracked as CVE-2025-10230, arises from inadequate validation in the…

EBy Emily CarterOct 16, 20252 min read

A critical remote code execution (RCE) vulnerability has been identified in Samba, potentially enabling attackers to compromise Active Directory domain controllers . This vulnerability, tracked as CVE-2025-10230, arises from inadequate validation in the Windows Internet Name Service (WINS) hook mechanism. It has been assigned a CVSS 3.1 score of 10.0 due to its high exploitability and severe impact.

Samba, an open-source implementation of the SMB/CIFS networking protocol, is a common tool in Linux and Unix environments for mimicking Windows file sharing and authentication services. This vulnerability poses a significant risk to organizations using Samba as an Active Directory Domain Controller (AD DC), exposing them to unauthorized attacks.

Security researcher Igor Morgenstern of Aisle Research discovered the issue, which affects all Samba versions from 4.0 onwards when specific configurations, such as WINS support and custom 'wins hook' scripts in the smb.conf file, are enabled.

WINS is a protocol from the pre-DNS era, used for resolving NetBIOS names in legacy Windows networks. It is disabled by default in Samba. However, when activated on an AD DC with the 'wins hook' parameter, which triggers an external script upon name changes, the system becomes vulnerable.

Attackers can exploit this by sending specially crafted WINS name registration requests containing shell metacharacters, allowing them to inject arbitrary commands into the hook script executed within a shell environment without requiring authentication or user interaction.

This vulnerability, tracked as CVE-2025-10230, arises from inadequate validation in the Windows Internet Name Service (WINS) hook mechanism.
Emily Carter · Thehackingpost

This vulnerability specifically impacts Samba in AD DC mode, affecting roles such as 'domain controller' or 'active directory domain controller'. Standalone or member servers utilizing a different WINS implementation are not affected. Successful exploitation could lead to full system compromise, data exfiltration, ransomware deployment, or privilege escalation, particularly in hybrid Windows-Linux enterprise environments.

Samba maintainers have released patches addressing this issue, with updated versions 4.23.2, 4.22.5, and 4.21.9 now available. Administrators are advised to prioritize these updates, especially in legacy environments dependent on WINS.

As a precaution, it is recommended to disable the 'wins hook' parameter or set 'wins support = no' in the smb.conf file. The default Samba configuration already avoids this risky combination, providing safety for most setups.

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Experts suggest a comprehensive review, emphasizing that WINS is an obsolete protocol and its continued use in modern domain controllers is discouraged. Even post-patch, disabling hooks altogether is advisable, as future Samba releases may remove support for them.

In light of expanding attack surfaces in hybrid cloud environments, this vulnerability highlights the importance of auditing and phasing out outdated protocols to prevent them from becoming entry points for cyber threats.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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