CVE-2024-35870: Linux kernel smb client UAF vulnerability in smb2_reconnect_server()
Summary
CVE-2024-35870: In the Linux kernel, the following vulnerability has been resolved: smb: client: fix UAF in smb2_reconnect_server() The UAF bug is due to smb2_reconnect_server() accessing a session that is already being teared down by a... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The linux-libc-dev package is a development package that provides the C library headers for the Linux kernel. It is used to compile and build applications that interact with the kernel. This package is an essential component for developers working on Linux-based systems. The linux-libc-dev package is vulnerable to a use-after-free (UAF) vulnerability in the smb2_reconnect_server() function of the kernel's smb client. This vulnerability can be exploited by an attacker to execute arbitrary code or cause a denial of service.
Vulnerability Detail
The UAF vulnerability in smb2_reconnect_server() occurs when the function accesses a session that is being torn down by another thread executing __cifs_put_smb_ses(). This can happen when the client has a connection to the server but no session, or when another thread sets the session status to something different than SES_EXITING. To fix this vulnerability, the ses_status variable needs to be unconditionally set to SES_EXITING and prevent other threads from setting a new status while the session is being torn down. Exploiting this vulnerability can lead to a general protection fault and potential code execution.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability at the moment.
Conclusion
The linux-libc-dev package is vulnerable to a use-after-free vulnerability in the smb2_reconnect_server() function of the kernel's smb client. This vulnerability can be exploited to execute arbitrary code or cause a denial of service. It is recommended to update the linux-libc-dev package to version 6.1.90-1 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can be exploited by an attacker to execute arbitrary code or cause a denial of service.
No, there is currently no known workaround for this vulnerability.
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The CVSS score of this vulnerability is 5.5, indicating a medium severity.
You can find more information about this vulnerability on the NIST National Vulnerability Database (NVD) at https://nvd.nist.gov/vuln/detail/CVE-2024-35870.
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