CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
10.1%
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 :
It was discovered that nfnl_cthelper_list structure was accessible to any user with CAP_NET_ADMIN capability in a network namespace. An unprivileged local user could exploit that to affect netfilter conntrack helpers on the host.
It was discovered that a nlmon link inside a child network namespace was not restricted to that namespace.
An unprivileged local user could exploit that to monitor system-wide netlink activity.
It was discovered that xt_osf_fingers data structure was accessible from any network namespace. This allowed unprivileged local users to bypass intended access restrictions and modify the system-wide OS fingerprint list used by specific iptables rules.
The KEYS subsystem omitted an access-control check when writing a key to the default keyring of the current task, allowing a local user to bypass security checks for the keyring. This compromised the validity of the keyring for those who relied on it.
If ‘dccp_ipv6’ module was loaded on the host, a local unprivileged user could trigger a kernel crash in dccp_write_xmit() or inet_csk_get_port() using 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.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(109621);
script_version("1.9");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id(
"CVE-2017-17448",
"CVE-2017-17449",
"CVE-2017-17450",
"CVE-2017-17807"
);
script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2018-024)");
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 :
- It was discovered that nfnl_cthelper_list structure was
accessible to any user with CAP_NET_ADMIN capability in
a network namespace. An unprivileged local user could
exploit that to affect netfilter conntrack helpers on
the host.
- It was discovered that a nlmon link inside a child
network namespace was not restricted to that namespace.
An unprivileged local user could exploit that to
monitor system-wide netlink activity.
- It was discovered that xt_osf_fingers data structure
was accessible from any network namespace. This allowed
unprivileged local users to bypass intended access
restrictions and modify the system-wide OS fingerprint
list used by specific iptables rules.
- The KEYS subsystem omitted an access-control check when
writing a key to the default keyring of the current
task, allowing a local user to bypass security checks
for the keyring. This compromised the validity of the
keyring for those who relied on it.
- If 'dccp_ipv6' module was loaded on the host, a local
unprivileged user could trigger a kernel crash in
dccp_write_xmit() or inet_csk_get_port() using 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.");
script_set_attribute(attribute:"see_also", value:"https://help.virtuozzo.com/customer/portal/articles/2938220");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17448");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17449");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17450");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2017-17807");
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=67f93df79aeefc3add4e4b31a752600f834236e2
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0d23d0fb");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-18.7-49.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3aa84d91");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-20.18-49.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?32340c78");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-33.22-49.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?30295d07");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-37.30-49.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c3022f85");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-40.4-49.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f5a96032");
script_set_attribute(attribute:"solution", value:"Update the readykernel patch.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/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:"2018/05/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/05/09");
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) 2018-2021 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-3.10.0-327.47.0.vz7.18.7",
"patch","readykernel-patch-18.7-49.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-327.47.0.vz7.20.18",
"patch","readykernel-patch-20.18-49.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-514.26.1.vz7.33.22",
"patch","readykernel-patch-33.22-49.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-693.1.1.vz7.37.30",
"patch","readykernel-patch-37.30-49.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-693.11.6.vz7.40.4",
"patch","readykernel-patch-40.4-49.0-1.vl7"
)
);
readykernel_execute_checks(checks:checks, severity:SECURITY_WARNING, release:"Virtuozzo-7");
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17448
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17449
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17450
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17807
www.nessus.org/u?0d23d0fb
www.nessus.org/u?30295d07
www.nessus.org/u?32340c78
www.nessus.org/u?3aa84d91
www.nessus.org/u?c3022f85
www.nessus.org/u?f5a96032
access.redhat.com/security/cve/cve-2017-17448
access.redhat.com/security/cve/cve-2017-17449
access.redhat.com/security/cve/cve-2017-17450
access.redhat.com/security/cve/cve-2017-17807
help.virtuozzo.com/customer/portal/articles/2938220
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
10.1%