CVE-2023-4458: Linux Kernel ksmbd smb2_open Out-Of-Bounds Read Information Disclosure Vulnerability
A flaw was found within the parsing of extended attributes in the kernel ksmbd module. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this to disclose sensitive information on affected installations of Linux. Only systems with ksmbd enabled are vulnerable to this CVE.
Other sources
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel. Authentication may or may not be required to exploit this vulnerability, depending upon configuration. Furthermore, only systems with ksmbd enabled are vulnerable.
The specific flaw exists within the parsing of extended attributes. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.
Reference: https://www.zerodayinitiative.com/advisories/ZDI-24-590/
— Red Hat
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2023-4458?
CVE-2023-4458 is classified as a medium severity vulnerability due to its potential to disclose sensitive information.
How do I fix CVE-2023-4458?
To fix CVE-2023-4458, you should update to the latest version of the Linux Kernel that resolves the validation issue in the ksmbd module.
What products are affected by CVE-2023-4458?
CVE-2023-4458 affects the Linux Kernel, specifically the ksmbd module found in distributions such as Red Hat.
What is the main impact of CVE-2023-4458?
The main impact of CVE-2023-4458 is the potential for attackers to read past allocated buffers, which can lead to information disclosure.
Who can exploit CVE-2023-4458?
CVE-2023-4458 can be exploited by any authenticated user who can send crafted requests to the ksmbd module.