Linux Kernel up to 6.5.1 ksmbd ksmbd_decode_ntlmssp_auth_blob buffer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 5.15.144/6.1.51/6.4.14/6.5/6.5.1. This affects the function ksmbd_decode_ntlmssp_auth_blob of the component ksmbd. Executing a manipulation can lead to buffer overflow. The identification of this vulnerability is CVE-2023-52440. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.144/6.1.51/6.4.14/6.5/6.5.1 (Operating System). It has been declared as critical. This vulnerability affects the function ksmbd_decode_ntlmssp_auth_blob of the component ksmbd. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slub overflow in ksmbd_decode_ntlmssp_auth_blob() If authblob->SessionKey.Length is bigger than session key size(CIFS_KEY_SIZE), slub overflow can happen in key exchange codes. cifs_arc4_crypt copy to session key array from SessionKey from client.

The weakness was shared 02/21/2024. The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2023-52440 since 02/20/2024. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/21/2024).

Upgrading to version 5.15.145, 6.1.52, 6.4.15, 6.5.2 or 6.6 eliminates this vulnerability. Applying the patch 4b081ce0d830/7f1d6cb0eb6a/30fd6521b2fb/bd554ed4fdc3/ecd7e1c562cb is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.15.144
• 6.0
• 6.1
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.1.24
• 6.1.25
• 6.1.26
• 6.1.27
• 6.1.28
• 6.1.29
• 6.1.30
• 6.1.31
• 6.1.32
• 6.1.33
• 6.1.34
• 6.1.35
• 6.1.36
• 6.1.37
• 6.1.38
• 6.1.39
• 6.1.40
• 6.1.41
• 6.1.42
• 6.1.43
• 6.1.44
• 6.1.45
• 6.1.46
• 6.1.47
• 6.1.48
• 6.1.49
• 6.1.50
• 6.1.51
• 6.2
• 6.3
• 6.4
• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 6.4.4
• 6.4.5
• 6.4.6
• 6.4.7
• 6.4.8
• 6.4.9
• 6.4.10
• 6.4.11
• 6.4.12
• 6.4.13
• 6.4.14
• 6.5
• 6.5.0
• 6.5.1

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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