Denial of Service Vulnerability in Samba Package - CVE-2018-1050
Summary
ALPINE-CVE-2018-1050: All versions of Samba from 4.0.0 onwards are vulnerable to a denial of service attack when the RPC spoolss service is configured to be run as an external daemon. Affects samba versions < 4.7.6-r0. Fixed in 4.7.6-r0. How to fix ↓
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Background
Samba is an open-source software suite that enables file and print services to SMB/CIFS clients. It allows for seamless interoperability between Linux/Unix servers and Windows-based clients. Samba is widely used in enterprise environments for sharing files and printers across different operating systems. However, all versions of Samba from 4.0.0 onwards are vulnerable to a denial of service attack when the RPC spoolss service is configured to run as an external daemon.
Vulnerability Detail
The vulnerability, identified as CVE-2018-1050, arises from missing input sanitization checks on certain input parameters to spoolss RPC calls. This oversight can lead to the print spooler service crashing, thereby causing a denial of service. Attackers can exploit this vulnerability to disrupt service availability, impacting users and applications relying on Samba for file and print services. The CVSS score for this vulnerability is 4.3, indicating a moderate severity level.
How To Fix
Minimum fixed version
4.7.6-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, consider disabling the RPC spoolss service if it is not essential for your operations. This can be done by modifying the Samba configuration file (usually located at /etc/samba/smb.conf) and commenting out or removing the spoolss service configuration.
Conclusion
CVE-2018-1050 represents a significant denial of service vulnerability in Samba that can affect a wide range of users. It is crucial to update to the patched version to ensure the security and availability of your services. Regular monitoring for vulnerabilities using tools like Vulert can help maintain a secure environment.
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FAQ
CVE-2018-1050 is a vulnerability in Samba that allows for a denial of service attack due to improper input sanitization in the RPC spoolss service.
You can check your Samba version by running the command smbd --version in your terminal. If your version is 4.0.0 or higher, you may be affected.
Exploitation of this vulnerability can lead to service disruptions, making file and print services unavailable to users and applications.
Yes, tools like Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software by analyzing your manifest files.
Detailed information about CVE-2018-1050 can be found on the official CVE database or through security advisories related to Samba.
References
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