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SUSE SLES12 Security Update : samba (SUSE-SU-2023:4040-1)

medium Nessus Plugin ID 182899

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Synopsis

The remote SUSE host is missing a security update.

Description

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2023:4040-1 advisory.

 - The SMB protocol allows opening files where the client requests read-only access, but then implicitly truncating the opened file if the client specifies a separate OVERWRITE create disposition. This operation requires write access to the file, and in the default Samba configuration the operating system kernel will deny access to open a read-only file for read/write (which the truncate operation requires). However, when Samba has been configured to ignore kernel file system permissions, Samba will truncate a file when the underlying operating system kernel would deny the operation. Affected Samba configurations are the ones where kernel file-system permission checks are bypassed, relying on Samba's own permission enforcement.
 The error is that this check is done against the client request for read-only access, and not the implicitly requested read-write (for truncate) one. The widely used Samba VFS module acl_xattr when configured with the module configuration parameter acl_xattr:ignore system acls = yes is the only upstream Samba module that allows this behavior and is the only known method of reproducing this security flaw. If (as is the default) the module configuration parameter acl_xattr:ignore system acls=no, then the Samba server is not vulnerable to this attack. (CVE-2023-4091)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://bugzilla.suse.com/1215904

http://www.nessus.org/u?458de42d

https://www.suse.com/security/cve/CVE-2023-4091

Plugin Details

Severity: Medium

ID: 182899

File Name: suse_SU-2023-4040-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 10/11/2023

Updated: 11/14/2023

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N

CVSS Score Source: CVE-2023-4091

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:samba-libs-python3-32bit, p-cpe:/a:novell:suse_linux:libsamba-policy0-python3, p-cpe:/a:novell:suse_linux:libsamba-policy0-python3-32bit, p-cpe:/a:novell:suse_linux:samba, p-cpe:/a:novell:suse_linux:samba-doc, p-cpe:/a:novell:suse_linux:samba-devel-32bit, p-cpe:/a:novell:suse_linux:samba-winbind-libs, p-cpe:/a:novell:suse_linux:samba-client-libs, p-cpe:/a:novell:suse_linux:samba-winbind-libs-32bit, p-cpe:/a:novell:suse_linux:libsamba-policy-python3-devel, p-cpe:/a:novell:suse_linux:samba-libs, p-cpe:/a:novell:suse_linux:samba-winbind, p-cpe:/a:novell:suse_linux:samba-tool, p-cpe:/a:novell:suse_linux:samba-client-32bit, p-cpe:/a:novell:suse_linux:samba-client, p-cpe:/a:novell:suse_linux:samba-python3, cpe:/o:novell:suse_linux:12, p-cpe:/a:novell:suse_linux:samba-ldb-ldap, p-cpe:/a:novell:suse_linux:libsamba-policy-devel, p-cpe:/a:novell:suse_linux:samba-libs-32bit, p-cpe:/a:novell:suse_linux:samba-libs-python3, p-cpe:/a:novell:suse_linux:ctdb, p-cpe:/a:novell:suse_linux:samba-client-libs-32bit, p-cpe:/a:novell:suse_linux:samba-devel

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 10/10/2023

Vulnerability Publication Date: 10/10/2023

Reference Information

CVE: CVE-2023-4091

IAVA: 2023-A-0535

SuSE: SUSE-SU-2023:4040-1