Virtuozzo 7 : readykernel-patch (VZA-2018-050)

medium Nessus Plugin ID 111582
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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 vulnerability :

- The implementation of timer_create system call in the Linux kernel before 4.14.8 doesn't properly validate the sigevent::sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

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://help.virtuozzo.com/customer/portal/articles/2950677

http://www.openwall.com/lists/oss-security/2018/08/02/3

http://www.nessus.org/u?903233bb

http://www.nessus.org/u?f3743365

http://www.nessus.org/u?d05a0bee

http://www.nessus.org/u?07422f3e

http://www.nessus.org/u?03069afa

http://www.nessus.org/u?547b160b

http://www.nessus.org/u?59613f5f

http://www.nessus.org/u?07caf03d

Plugin Details

Severity: Medium

ID: 111582

File Name: Virtuozzo_VZA-2018-050.nasl

Version: 1.7

Type: local

Published: 8/7/2018

Updated: 3/8/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.7

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

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

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5.1

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

Temporal Vector: E:F/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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/6/2018

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2017-18344