CVE-2023-32258

2023-07-2400:00:00

ubuntu.com

linux kernel

ksmbd

smb server

smb2_logoff

smb2_close

vulnerability

code execution

object locking

bugzilla

zdi-23-706

zdi-can-20796

ksmbd-tools

unix

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

0.002 Low

EPSS

Percentile

58.7%

JSON

A flaw was found in the Linux kernel’s ksmbd, a high-performance in-kernel
SMB server. The specific flaw exists within the processing of SMB2_LOGOFF
and SMB2_CLOSE commands. The issue results from the lack of proper locking
when performing operations on an object. An attacker can leverage this
vulnerability to execute code in the context of the kernel.

Bugs

Notes

Author	Note
rodrigo-zaiden	also kwnon as ZDI-23-706, ZDI-CAN-20796 needs ksmbd-tools installed to enable the service, which is not installed by default.

OSVersionArchitecturePackageVersionFilename
ubuntu22.04noarchlinux< 5.15.0-102.112UNKNOWN
ubuntu23.04noarchlinux< 6.2.0-32.32UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1057.63UNKNOWN
ubuntu23.04noarchlinux-aws< 6.2.0-1011.11UNKNOWN
ubuntu20.04noarchlinux-aws-5.15< 5.15.0-1057.63~20.04.1UNKNOWN
ubuntu22.04noarchlinux-aws-6.2< 6.2.0-1011.11~22.04.1UNKNOWN
ubuntu22.04noarchlinux-azure< 5.15.0-1060.69UNKNOWN
ubuntu23.04noarchlinux-azure< 6.2.0-1011.11UNKNOWN
ubuntu20.04noarchlinux-azure-5.15< 5.15.0-1060.69~20.04.1UNKNOWN
ubuntu22.04noarchlinux-azure-fde< 5.15.0-1060.69.1UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	22.04	noarch	linux	< 5.15.0-102.112	UNKNOWN
ubuntu	23.04	noarch	linux	< 6.2.0-32.32	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1057.63	UNKNOWN
ubuntu	23.04	noarch	linux-aws	< 6.2.0-1011.11	UNKNOWN
ubuntu	20.04	noarch	linux-aws-5.15	< 5.15.0-1057.63~20.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-aws-6.2	< 6.2.0-1011.11~22.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-azure	< 5.15.0-1060.69	UNKNOWN
ubuntu	23.04	noarch	linux-azure	< 6.2.0-1011.11	UNKNOWN
ubuntu	20.04	noarch	linux-azure-5.15	< 5.15.0-1060.69~20.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-azure-fde	< 5.15.0-1060.69.1	UNKNOWN