Virtuozzo 7 : readykernel-patch (VZA-2017-007)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


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 :

- A double free vulnerability was found in netlink_dump,
which could cause a denial of service or possibly other
unspecified impact.

- It was discovered that the Linux kernel since 3.6-rc1
with 'net.ipv4.tcp_fastopen' set to 1 can hit BUG()
statement in tcp_collapse() function after making a
number of certain syscalls leading to a possible system
crash.

- A flaw was found in the way nfnetlink validated length
of batch messages that could allow a user logged in to
a container as root to cause a general protection fault
and crash the host.

- A flaw was found in the way nfnetlink handled errors
while processing batch messages that could allow a user
logged in to a container as root to trigger use after
free and crash the host.

- A security flaw was found in the Linux kernel that an
attempt to move page mapped by AIO ring buffer to the
other node triggers NULL pointer dereference at
trace_writeback_dirty_page(), because
aio_fs_backing_dev_info.dev is 0.

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.

See also :

https://help.virtuozzo.com/customer/portal/articles/2750452
https://access.redhat.com/security/cve/cve-2016-3070
https://access.redhat.com/security/cve/cve-2016-8645
https://access.redhat.com/security/cve/cve-2016-9806
http://www.nessus.org/u?356fc3c7

Solution :

Update the readykernel patch.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Virtuozzo Local Security Checks

Nessus Plugin ID: 97979 ()

Bugtraq ID:

CVE ID: CVE-2016-3070
CVE-2016-8645
CVE-2016-9806

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