CVE-2018-10918 : Security Advisory and Response

Samba software versions prior to 4.7.9 and 4.8.4 are vulnerable to a null pointer dereference flaw that can be exploited by authenticated attackers. This vulnerability can lead to a server crash on systems configured as Active Directory Domain Controllers.

Understanding CVE-2018-10918

This CVE involves a vulnerability in Samba software that could allow an authenticated attacker to crash a server configured as an Active Directory Domain Controller.

What is CVE-2018-10918?

A null pointer dereference flaw in Samba software can be triggered when verifying database outputs from the LDB database layer. This flaw affects versions prior to 4.7.9 and 4.8.4, potentially leading to a server crash.

The Impact of CVE-2018-10918

The vulnerability poses a medium severity risk with a CVSS base score of 5.2. An attacker with low privileges can exploit this flaw to cause a denial of service on affected systems.

Technical Details of CVE-2018-10918

Samba software vulnerability details and impact.

Vulnerability Description

The vulnerability arises from a null pointer dereference error in the LDB database layer verification process, allowing authenticated attackers to crash Samba servers configured as Active Directory Domain Controllers.

Affected Systems and Versions

Product: Samba
Vendor: The Samba Team
Vulnerable Versions: 4.7.9, 4.8.4

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Adjacent Network
Privileges Required: Low
User Interaction: Required
Scope: Unchanged
Availability Impact: High
Confidentiality Impact: None
Integrity Impact: None

Mitigation and Prevention

Protecting systems from CVE-2018-10918.

Immediate Steps to Take

Update Samba software to versions 4.7.9 or 4.8.4 to mitigate the vulnerability.
Monitor for any unusual server crashes or denial of service incidents.

Long-Term Security Practices

Regularly update and patch Samba software to address known vulnerabilities.
Implement strong authentication mechanisms to prevent unauthorized access.

Patching and Updates

Apply security patches provided by Samba promptly to address vulnerabilities and enhance system security.