SUSE SLED15 / SLES15 / openSUSE 15 Security Update : xen (SUSE-SU-2023:4476-1)

medium Nessus Plugin ID 185977



The remote SUSE host is missing one or more security updates.


The remote openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4476-1 advisory.

- A division-by-zero error on some AMD processors can potentially return speculative data resulting in loss of confidentiality. (CVE-2023-20588)

- arm32: The cache may not be properly cleaned/invalidated [XSA-437, CVE-2023-34321] top-level shadow reference dropped too early for 64-bit PV guests [XSA-438, CVE-2023-34322] x86/AMD: Divide speculative information leak [XSA-439, CVE-2023-20588] (CVE-2023-34322)

- The vulnerability exists due to insufficient validation of user-supplied input in libfsimage. A remote guest can use pygrab to trigger stack-based buffer overflow and execute arbitrary code on the host system (CVE-2023-34325)

- The vulnerability exists due to missing IOMMU TLB flushing on x86/AMD systems. A malicious guest can access memory not owned by the guest and escalate privileges on the system. (CVE-2023-34326)

- The vulnerability exists due to improper validation of guest state when using Debug Masks in HVM vCPU. A malicious guest can perform a denial of service (DoS) attack against the guest OS. (CVE-2023-34327)

- The vulnerability exists due to improper validation of guest state in PV vCPU. A malicious guest place a breakpoint over the live GDT and perform a denial of service (DoS) attack against the host.

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


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 185977

File Name: suse_SU-2023-4476-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 11/17/2023

Updated: 12/1/2023

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

Risk Information


Risk Factor: Critical

Score: 9.2


Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2023-20588


Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

Vulnerability Information

CPE: cpe:/o:novell:suse_linux:15, p-cpe:/a:novell:suse_linux:xen, p-cpe:/a:novell:suse_linux:xen-devel, p-cpe:/a:novell:suse_linux:xen-libs, p-cpe:/a:novell:suse_linux:xen-tools, p-cpe:/a:novell:suse_linux:xen-tools-domu, p-cpe:/a:novell:suse_linux:xen-tools-xendomains-wait-disk

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: 11/17/2023

Vulnerability Publication Date: 8/8/2023

Reference Information

CVE: CVE-2023-20588, CVE-2023-34322, CVE-2023-34325, CVE-2023-34326, CVE-2023-34327, CVE-2023-34328, CVE-2023-46835, CVE-2023-46836

IAVB: 2023-B-0067-S, 2023-B-0081-S, 2023-B-0090

SuSE: SUSE-SU-2023:4476-1