SUSE SLES12 / SLES15 Security Update : kernel (Live Patch 16 for SLE 12 SP4) (SUSE-SU-2021:3073-1)

high Nessus Plugin ID 153463

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Synopsis

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

Description

The remote SUSE Linux SLES12 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3073-1 advisory.

- A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the int_ctl field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. This flaw affects Linux kernel versions prior to 5.14-rc7. (CVE-2021-3653)

- A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the virt_ext field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape. (CVE-2021-3656)

- arch/x86/kvm/mmu/paging_tmpl.h in the Linux kernel before 5.12.11 incorrectly computes the access permissions of a shadow page, leading to a missing guest protection page fault. (CVE-2021-38198)

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

Solution

Update the affected kernel-livepatch-5_3_18-59_19-default, kgraft-patch-4_12_14-122_83-default and / or kgraft- patch-4_12_14-95_60-default packages.

See Also

https://www.suse.com/security/cve/CVE-2021-3653

https://www.suse.com/security/cve/CVE-2021-3656

https://www.suse.com/security/cve/CVE-2021-38198

https://bugzilla.suse.com/1189278

https://bugzilla.suse.com/1189418

https://bugzilla.suse.com/1189420

http://www.nessus.org/u?9b112276

Plugin Details

Severity: High

ID: 153463

File Name: suse_SU-2021-3073-1.nasl

Version: 1.5

Type: local

Agent: unix

Published: 9/17/2021

Updated: 11/30/2022

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

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-3656

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:2.3:o:novell:suse_linux:12:*:*:*:*:*:*:*, cpe:2.3:o:novell:suse_linux:15:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:kgraft-patch-4_12_14-122_83-default:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:kernel-livepatch-5_3_18-59_19-default:*:*:*:*:*:*:*, p-cpe:2.3:a:novell:suse_linux:kgraft-patch-4_12_14-95_60-default:*:*:*:*:*:*:*

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: 9/16/2021

Vulnerability Publication Date: 8/8/2021

Reference Information

CVE: CVE-2021-38198, CVE-2021-3656, CVE-2021-3653

SuSE: SUSE-SU-2021:3073-1