Heap-Buffer Overflow in Samba Client (CVE-2018-10858)
Summary
CVE-2018-10858: A heap-buffer overflow was found in the way samba clients processed extra long filename in a directory listing. Affects samba across 2 version ranges.
< 4.8.4-r0
< 18df99ba0bfc466b877d5875bef3ab1279b0e7dc
Fixed in 4.8.4-r0. How to fix ↓
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Background
Samba is an open-source software suite that provides file and print services for Windows clients. It allows Linux and Unix systems to act as file and print servers for Windows systems. The vulnerability, CVE-2018-10858, is a heap-buffer overflow that affects Samba clients. It occurs when processing extra long filenames in a directory listing. An attacker could exploit this flaw by hosting a malicious Samba server and causing arbitrary code execution on a vulnerable Samba client. The vulnerability has a CVSS score of 8.8, indicating a high severity level.
Vulnerability Detail
The heap-buffer overflow vulnerability in Samba clients allows an attacker to execute arbitrary code on a targeted Samba client. By sending a specially crafted directory listing with an excessively long filename, the attacker can trigger a buffer overflow, leading to the execution of arbitrary code. This can result in a complete compromise of the affected system, allowing the attacker to gain unauthorized access, modify data, or launch further attacks. The vulnerability affects Samba versions prior to 4.6.16, 4.7.9, and 4.8.4.
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, users can disable the use of Samba clients or block access to Samba servers from untrusted sources. This can help mitigate the risk of exploitation until the vulnerable Samba package can be updated. However, this workaround may impact the functionality of systems that rely on Samba for file and print services.
Conclusion
The heap-buffer overflow vulnerability in Samba clients (CVE-2018-10858) poses a significant risk to systems running vulnerable versions of Samba. It is crucial to update the Samba package to version 4.8.4 or later to mitigate the risk of arbitrary code execution. Regularly updating all software packages is also recommended to ensure the latest security patches are applied. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Samba is an open-source software suite that allows Linux and Unix systems to act as file and print servers for Windows clients.
The vulnerability allows an attacker to execute arbitrary code on a vulnerable Samba client, potentially leading to unauthorized access, data modification, or further attacks.
Samba versions prior to 4.6.16, 4.7.9, and 4.8.4 are vulnerable to this heap-buffer overflow vulnerability.
To fix the vulnerability, update the Samba package to version 4.8.4 or later. Check your distribution's package repositories for the latest version and apply the update.
As a temporary workaround, you can disable the use of Samba clients or block access to Samba servers from untrusted sources.
References
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