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

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 :

- 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.

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

Solution :

Update the readykernel patch.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Virtuozzo Local Security Checks

Nessus Plugin ID: 100466 ()

Bugtraq ID:

CVE ID: CVE-2017-7645
CVE-2017-7895

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