CVE-2023-52442

ksmbd: validate session id and tree id in compound request

Severity Score

9.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: validate session id and tree id in compound request

`smb2_get_msg()` in smb2_get_ksmbd_tcon() and smb2_check_user_session()
will always return the first request smb2 header in a compound request.
if `SMB2_TREE_CONNECT_HE` is the first command in compound request, will
return 0, i.e. The tree id check is skipped.
This patch use ksmbd_req_buf_next() to get current command in compound.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ksmbd: validar la identificación de la sesión y la identificación del árbol en la solicitud compuesta `smb2_get_msg()` en smb2_get_ksmbd_tcon() y smb2_check_user_session() siempre devolverá el encabezado smb2 de la primera solicitud en una solicitud compuesta. si `SMB2_TREE_CONNECT_HE` es el primer comando en la solicitud compuesta, devolverá 0, es decir, se omite la verificación de identificación del árbol. Este parche usa ksmbd_req_buf_next() para obtener el comando actual en compuesto.

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.
The specific flaw exists within the handling of chained requests. The issue results from the lack of proper validation of user-supplied requests prior to processing them. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel.

*Credits: HexRabbit (@h3xr4bb1t)

CVSS Scores

ZDIv3 9.3

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-20 CVE Reserved
2024-02-21 CVE Published
2024-02-21 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/017d85c94f02090a87f4a473dbe0d6ee0da72693	2023-12-23
https://git.kernel.org/stable/c/becb5191d1d5fdfca0198a2e37457bbbf4fe266f	2023-09-13
https://git.kernel.org/stable/c/4c2b350b2e269e3fd17bbfa42de1b42775b777ac	2023-09-13
https://git.kernel.org/stable/c/3df0411e132ee74a87aa13142dfd2b190275332e	2023-07-23

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.145 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.145"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.1.53 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.53"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.4.16 Search vendor "Linux" for product "Linux Kernel" and version " < 6.4.16"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.5 Search vendor "Linux" for product "Linux Kernel" and version " < 6.5"		en		Affected