Security Bulletin: AIX is vulnerable to a denial of service due to the AIX SMB client (CVE-2023-45165)

Summary

A vulnerability in the AIX SMB client daemon could allow a non-privileged local user to cause a denial of service (CVE-2023-45165). AIX uses the SMB client daemon to access files on SMB servers.

Vulnerability Details

CVEID:CVE-2023-45165
**DESCRIPTION:**IBM AIX could allow a non-privileged local user to exploit a vulnerability in the AIX SMB client to cause a denial of service.
CVSS Base score: 6.2
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/267963 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

The following fileset levels are vulnerable:

To determine if your system is vulnerable, execute the following commands:

lslpp -L | grep -i smbc.rte

Remediation/Fixes

FIXES

IBM strongly recommends addressing the vulnerability now.

The latest SMB client fileset may be downloaded from:

<https://www.ibm.com/resources/mrs/assets?source=aixbp&gt;

To extract the fixes from the tar file:

For AIX 7.2 and 7.3 TL0:

gunzip smbc_302_fileset_72.tar.gz | tar xvf

For AIX 7.3 TL1:

gunzip smbc_302_fileset_73.tar.gz | tar xvf

IMPORTANT: If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding.

To preview the fix installation:

installp -apYd . smbc

To install the fix package:

installp -aXYd . smbc

Workarounds and Mitigations

None