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 :
Linux kernel built with the KVM virtualisation support (CONFIG_KVM), with nested virtualisation (nVMX) feature enabled (nested=1), is vulnerable to a stack buffer overflow issue. It could occur while traversing guest pagetable entries to resolve guest virtual address. A guest system could use this flaw to crash the host kernel resulting in DoS, or potentially execute arbitrary code on the host.
A flaw was found in the Linux networking subsystem where a local attacker with CAP_NET_ADMIN capabilities could cause an out-of-bounds memory access by creating a smaller-than-expected ICMP header and sending to its destination via sendto().
It was found that in the Linux kernel through v4.14-rc5, bio_map_user_iov() and bio_unmap_user() in ‘block/bio.c’ do unbalanced pages refcounting if IO vector has small consecutive buffers belonging to the same page. bio_add_pc_page() merges them into one, but the page reference is never dropped, causing a memory leak and possible system lockup due to out-of-memory condition.
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.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(104132);
script_version("3.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id(
"CVE-2016-8399",
"CVE-2017-12188",
"CVE-2017-12190"
);
script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2017-098)");
script_summary(english:"Checks the readykernel output for the updated patch.");
script_set_attribute(attribute:"synopsis", value:
"The remote Virtuozzo host is missing a security update.");
script_set_attribute(attribute:"description", value:
"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 :
- Linux kernel built with the KVM virtualisation support
(CONFIG_KVM), with nested virtualisation (nVMX) feature
enabled (nested=1), is vulnerable to a stack buffer
overflow issue. It could occur while traversing guest
pagetable entries to resolve guest virtual address. A
guest system could use this flaw to crash the host
kernel resulting in DoS, or potentially execute
arbitrary code on the host.
- A flaw was found in the Linux networking subsystem
where a local attacker with CAP_NET_ADMIN capabilities
could cause an out-of-bounds memory access by creating
a smaller-than-expected ICMP header and sending to its
destination via sendto().
- It was found that in the Linux kernel through
v4.14-rc5, bio_map_user_iov() and bio_unmap_user() in
'block/bio.c' do unbalanced pages refcounting if IO
vector has small consecutive buffers belonging to the
same page. bio_add_pc_page() merges them into one, but
the page reference is never dropped, causing a memory
leak and possible system lockup due to out-of-memory
condition.
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.");
script_set_attribute(attribute:"see_also", value:"https://help.virtuozzo.com/customer/portal/articles/2892758");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.10-35.2-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2636ca46");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-30.15-35.2-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ce2ff292");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-33.22-35.2-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3ffa1df3");
script_set_attribute(attribute:"solution", value:"Update the readykernel patch.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"patch_publication_date", value:"2017/10/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/25");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:virtuozzo:virtuozzo:readykernel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:virtuozzo:virtuozzo:7");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Virtuozzo Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Virtuozzo/release", "Host/Virtuozzo/rpm-list", "Host/readykernel-info");
exit(0);
}
include("global_settings.inc");
include("readykernel.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Virtuozzo/release");
if (isnull(release) || "Virtuozzo" >!< release) audit(AUDIT_OS_NOT, "Virtuozzo");
os_ver = pregmatch(pattern: "Virtuozzo Linux release ([0-9]+\.[0-9])(\D|$)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Virtuozzo");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Virtuozzo 7.x", "Virtuozzo " + os_ver);
if (!get_kb_item("Host/Virtuozzo/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Virtuozzo", cpu);
rk_info = get_kb_item("Host/readykernel-info");
if (empty_or_null(rk_info)) audit(AUDIT_UNKNOWN_APP_VER, "Virtuozzo");
checks = make_list2(
make_array(
"kernel","vzkernel-3.10.0-514.16.1.vz7.30.10",
"patch","readykernel-patch-30.10-35.2-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-514.16.1.vz7.30.15",
"patch","readykernel-patch-30.15-35.2-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-514.26.1.vz7.33.22",
"patch","readykernel-patch-33.22-35.2-1.vl7"
)
);
readykernel_execute_checks(checks:checks, severity:SECURITY_HOLE, release:"Virtuozzo-7");