Virtuozzo 7 : readykernel-patch (VZA-2017-038)

critical Nessus Plugin ID 100466
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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 :

 - The NFS2/3 RPC client could send long arguments to nfsd server. These encoded arguments are stored in an array of memory pages, and accessed via various pointer variables. Arbitrarily long arguments could make these pointers point outside the array, thus causing out-of-bounds memory access. A remote user/program could use this flaw to crash the kernel resulting in DoS.

 - The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lack certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly have unspecified other impact via crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c.

 - If sctp module is loaded on the host, a privileged user inside a container can cause a kernel crash by triggering a NULL pointer dererefence in sctp_endpoint_destroy() function with a specially crafted sequence of system calls.

 - A privileged user inside a container can cause a kernel crash by triggering a BUG_ON in unregister_netdevice_many() function with a specially crafted sequence of system calls.

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/2812513

http://www.nessus.org/u?e35a0d51

http://www.nessus.org/u?e718308f

http://www.nessus.org/u?1a0bddd6

Plugin Details

Severity: Critical

ID: 100466

File Name: Virtuozzo_VZA-2017-038.nasl

Version: 3.12

Type: local

Published: 5/30/2017

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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

Patch Publication Date: 5/23/2017

Reference Information

CVE: CVE-2017-7645, CVE-2017-7895