Linux Kernel up to 6.3 ksmbd fs/ksmbd/smb2pdu.c smb2_sess_setup improper authentication

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.3 and classified as critical. Affected is the function smb2_sess_setup of the file fs/ksmbd/smb2pdu.c of the component ksmbd. The manipulation results in improper authentication. This vulnerability was named CVE-2023-32251. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 6.3 (Operating System). Affected is the function smb2_sess_setup of the file fs/ksmbd/smb2pdu.c of the component ksmbd. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality. CVE summarizes:

A vulnerability has been identified in the Linux kernel's ksmbd component (kernel SMB/CIFS server). A security control designed to prevent dictionary attacks, which introduces a 5-second delay during session setup, can be bypassed through the use of asynchronous requests. This bypass negates the intended anti-brute-force protection, potentially allowing attackers to conduct dictionary attacks more efficiently against user credentials or other authentication mechanisms.

The weakness was presented 05/18/2023. The advisory is available at zerodayinitiative.com. This vulnerability is traded as CVE-2023-32251 since 05/05/2023. Technical details are known, but there is no available exploit.

Upgrading to version 6.4-rc1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch b096d97f47326b1e2dbdef1c91fab69ffda54d17 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-36508). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.0
• 6.1
• 6.2
• 6.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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