Virtuozzo 7 : readykernel-patch (VZA-2017-017)

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 use-after-free flaw was found in the way the Linux
kernel's Datagram Congestion Control Protocol (DCCP)
implementation freed SKB (socket buffer) resources for
a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO
option is set on the socket. A local, unprivileged user
could use this flaw to alter the kernel memory,
allowing them to escalate their privileges on the
system.

- A syntax vulnerability was discovered in the kernel's
ASN1.1 DER decoder, which could lead to memory
corruption or a complete local denial of service
through x509 certificate DER files. A local system user
could use a specially created key file to trigger
BUG_ON() in the public_key_verify_signature() function
(crypto/asymmetric_keys/public_key.c), to cause a
kernel panic and crash the system.

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/2768609
http://www.nessus.org/u?29e49789
http://www.nessus.org/u?0f3e5dc7
http://www.nessus.org/u?4a05c1b3

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 : 6.0
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Virtuozzo Local Security Checks

Nessus Plugin ID: 97984 ()

Bugtraq ID:

CVE ID: CVE-2016-2053
CVE-2017-6074

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