Information Disclosure Vulnerability in Samba: CVE-2018-10919
Summary
ALPINE-CVE-2018-10919: The Samba Active Directory LDAP server was vulnerable to an information disclosure flaw because of missing access control checks. Affects samba versions < 4.8.4-r0. Fixed in 4.8.4-r0. How to fix ↓
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Background
Samba is an open-source software suite that provides seamless file and print services to SMB/CIFS clients. It allows for interoperability between Linux/Unix servers and Windows-based clients. Samba's Active Directory LDAP server is crucial for managing user access and permissions in a networked environment. However, it has been found vulnerable to an information disclosure flaw that could allow unauthorized access to sensitive data.
Vulnerability Detail
The vulnerability, identified as CVE-2018-10919, arises from missing access control checks in the Samba Active Directory LDAP server. This flaw enables an authenticated attacker to exploit LDAP search expressions to extract confidential attribute values. The potential ramifications include unauthorized access to sensitive information, which could lead to further exploitation within the network. Versions of Samba prior to 4.6.16, 4.7.9, and 4.8.4 are affected by this vulnerability, making it critical for users to address it promptly.
How To Fix
Minimum fixed version
4.8.4-r0
This is the first release that contains the fix.
sudo apk add --upgrade sambaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, administrators can restrict access to the LDAP server by implementing stricter firewall rules or by limiting the permissions of authenticated users until the package can be updated.
Conclusion
CVE-2018-10919 represents a significant security risk for users of Samba's Active Directory LDAP server. It is essential for administrators to update to the patched version to protect against potential information disclosure. Utilizing tools like Vulert can aid in monitoring and managing vulnerabilities effectively.
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FAQ
CVE-2018-10919 is a vulnerability in the Samba Active Directory LDAP server that allows authenticated attackers to extract confidential attribute values due to missing access control checks.
Samba versions prior to 4.6.16, 4.7.9, and 4.8.4 are vulnerable to this issue.
You can use Vulert, which monitors open-source vulnerabilities in real-time. By uploading your manifest file like package-lock.json, you can check for vulnerabilities without needing to install any software.
The CVSS score for CVE-2018-10919 is 6.5, indicating a medium severity level.
If immediate updates are not possible, consider implementing stricter access controls and firewall rules to mitigate the risk of exploitation.
References
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