Virtuozzo 7 : anaconda / anaconda-core / anaconda-dracut / etc (VZA-2018-037)

high Nessus Plugin ID 110234

Synopsis

The remote Virtuozzo host is missing multiple security updates.

Description

According to the versions of the anaconda / anaconda-core / anaconda-dracut / etc packages installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

- A flaw was found in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions.
During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

- An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. NOTE:
This fix also requires CPU microcode/firmware updates and subscribers are advised to contact their hardware OEM vendors to receive the appropriate microcode/firmware for their processor. A kernel update, without the appropriate firmware/microcode updated for the processor, is insufficient to remediate this vulnerability.

- A flaw was found in the way the Linux kernel handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged system user could use this flaw to crash the system kernel resulting in the denial of service.

Note that Tenable Network Security has extracted the preceding description block directly from the Virtuozzo security advisory.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected anaconda / anaconda-core / anaconda-dracut / etc packages.

Plugin Details

Severity: High

ID: 110234

File Name: Virtuozzo_VZA-2018-037.nasl

Version: 1.10

Type: local

Family: Virtuozzo Local Security Checks

Published: 5/31/2018

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.6

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: p-cpe:/a:virtuozzo:virtuozzo:anaconda, p-cpe:/a:virtuozzo:virtuozzo:anaconda-core, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-iscsi, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-logical, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-mpath, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-rbd, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-scsi, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-vz, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-kvm, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-lxc, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-vz, p-cpe:/a:virtuozzo:virtuozzo:libvirt-devel, p-cpe:/a:virtuozzo:virtuozzo:libvirt-docs, p-cpe:/a:virtuozzo:virtuozzo:libvirt-libs, p-cpe:/a:virtuozzo:virtuozzo:libvirt-lock-sanlock, p-cpe:/a:virtuozzo:virtuozzo:libvirt-login-shell, p-cpe:/a:virtuozzo:virtuozzo:libvirt-nss, p-cpe:/a:virtuozzo:virtuozzo:libvzctl, p-cpe:/a:virtuozzo:virtuozzo:libvzctl-devel, p-cpe:/a:virtuozzo:virtuozzo:prl-disp-legacy, p-cpe:/a:virtuozzo:virtuozzo:prl-disp-service, p-cpe:/a:virtuozzo:virtuozzo:prl-disp-service-tests, p-cpe:/a:virtuozzo:virtuozzo:prlctl, p-cpe:/a:virtuozzo:virtuozzo:qemu-img-vz, p-cpe:/a:virtuozzo:virtuozzo:qemu-kvm-common-vz, p-cpe:/a:virtuozzo:virtuozzo:qemu-kvm-tools-vz, p-cpe:/a:virtuozzo:virtuozzo:qemu-kvm-vz, p-cpe:/a:virtuozzo:virtuozzo:vzkernel, p-cpe:/a:virtuozzo:virtuozzo:vzkernel-debug, p-cpe:/a:virtuozzo:virtuozzo:vzkernel-debug-devel, p-cpe:/a:virtuozzo:virtuozzo:anaconda-dracut, p-cpe:/a:virtuozzo:virtuozzo:anaconda-gui, p-cpe:/a:virtuozzo:virtuozzo:anaconda-tui, p-cpe:/a:virtuozzo:virtuozzo:anaconda-widgets, p-cpe:/a:virtuozzo:virtuozzo:anaconda-widgets-devel, p-cpe:/a:virtuozzo:virtuozzo:cpupools, p-cpe:/a:virtuozzo:virtuozzo:cpupools-features, p-cpe:/a:virtuozzo:virtuozzo:kpatch-kmod-48.1, p-cpe:/a:virtuozzo:virtuozzo:ksm-vz, p-cpe:/a:virtuozzo:virtuozzo:libvirt, p-cpe:/a:virtuozzo:virtuozzo:libvirt-admin, p-cpe:/a:virtuozzo:virtuozzo:libvirt-client, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-config-network, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-config-nwfilter, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-interface, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-lxc, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-network, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-nodedev, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-nwfilter, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-qemu, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-secret, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-core, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-disk, p-cpe:/a:virtuozzo:virtuozzo:libvirt-daemon-driver-storage-gluster, p-cpe:/a:virtuozzo:virtuozzo:vzkernel-devel, p-cpe:/a:virtuozzo:virtuozzo:vzkernel-headers, cpe:/o:virtuozzo:virtuozzo:7

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/30/2018

Exploitable With

Metasploit (Microsoft Windows POP/MOV SS Local Privilege Elevation Vulnerability)

Reference Information

CVE: CVE-2018-1087, CVE-2018-3639, CVE-2018-8897

Detections

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