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

Medium Nessus Plugin ID 133461

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.

See Also

https://virtuozzosupport.force.com/s/article/VZA-2019-081

https://bugzilla.redhat.com/show_bug.cgi?id=1716328

https://bugzilla.redhat.com/show_bug.cgi?id=1738705

http://www.nessus.org/u?8c15051e

http://www.nessus.org/u?fddf855e

http://www.nessus.org/u?d7ce08c9

http://www.nessus.org/u?5c250910

http://www.nessus.org/u?72420f9b

http://www.nessus.org/u?9693c7fe

http://www.nessus.org/u?df030fea

http://www.nessus.org/u?4271804e

http://www.nessus.org/u?b0eb04cb

Plugin Details

Severity: Medium

ID: 133461

File Name: Virtuozzo_VZA-2019-081.nasl

Version: 1.2

Type: local

Published: 2020/02/04

Updated: 2020/02/07

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2018-20856

CVSS v2.0

Base Score: 4.6

Temporal Score: 3.4

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

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

CVSS v3.0

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: CVSS:3.0/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: 2019/10/16

Reference Information

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