Virtuozzo 7 : readykernel-patch (VZA-2019-081)

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Virtuozzo 7 : readykernel-patch (VZA-2019-081)

high Nessus Plugin ID 133461

New! Plugin Severity Now Using CVSS v3

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Synopsis

The remote Virtuozzo host is missing a security update.

Description

According to the version of the vzkernel package and the readykernel-patch installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

- [3.10.0-693.21.1.vz7.46.7 to 3.10.0-957.12.2.vz7.96.21] Use-after-free in __blk_drain_queue() function. It was found that a use-after-free condition could be triggered in the block device subsystem while the outstanding command queue was drained. A patient local attacker can use this flaw to crash the system or, potentially, to escalate their privileges.

- [3.10.0-693.21.1.vz7.46.7 to 3.10.0-957.12.2.vz7.96.21] tun: potential kernel crash when TUNSETIFF ioctl operation is used for a device with an invalid name.

- [3.10.0-693.21.1.vz7.46.7 to 3.10.0-957.12.2.vz7.96.21] Certain operations with iptables in a container may crash the kernel.

- [3.10.0-693.21.1.vz7.46.7 to 3.10.0-957.12.2.vz7.96.21] A container that tries to mount NFS shares may cause the whole system to hang in certain conditions.

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 readykernel patch.

Plugin Details

Severity: High

ID: 133461

File Name: Virtuozzo_VZA-2019-081.nasl

Version: 1.3

Type: local

Family: Virtuozzo Local Security Checks

Published: 2/4/2020

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2018-20856

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

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

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: p-cpe:/a:virtuozzo:virtuozzo:readykernel, cpe:/o:virtuozzo:virtuozzo:7

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/16/2019

Reference Information

CVE: CVE-2018-20856, CVE-2018-7191