Virtuozzo 7 : readykernel-patch (VZA-2019-086)

High Nessus Plugin ID 133463

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.vz7.48.2 to 3.10.0-957.12.2.vz7.96.21] Potential kernel crash in __tcp_retransmit_skb(). It was discovered that a local unprivileged attacker could use a specially crafted sequence of system calls to trigger either a kernel crash in __tcp_retransmit_skb() or use-after-free conditions, which could result in privilege escalation.

- [3.10.0-693.21.1.vz7.48.2 to 3.10.0-957.12.2.vz7.96.21] KVM: Out-of-bounds memory access via MMIO ring buffer.
An issue was found in the implementation of the coalesced MMIO write operation in KVM. The indices used to access an MMIO ring buffer could be supplied by a user-space process in the host system. An attacker with access to /dev/kvm could use this flaw to trigger out-of-bounds memory access and crash the host kernel or, potentially, escalate their privileges.

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-2019-086

http://www.nessus.org/u?ae500723

http://www.nessus.org/u?beb8144c

http://www.nessus.org/u?c61d1e3b

http://www.nessus.org/u?c312f3a6

http://www.nessus.org/u?b984849f

http://www.nessus.org/u?ef5b9f31

http://www.nessus.org/u?e9257f5d

http://www.nessus.org/u?1d05611b

Plugin Details

Severity: High

ID: 133463

File Name: Virtuozzo_VZA-2019-086.nasl

Version: 1.2

Type: local

Published: 2020/02/04

Updated: 2020/02/07

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS Score Source: CVE-2019-15239

CVSS v2.0

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 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: 2019/11/13

Reference Information

CVE: CVE-2019-14821, CVE-2019-15239