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 :
[3.10.0-693.21.1.vz7.48.2 to 3.10.0-957.12.2.vz7.96.21] Potential kernel crash in __tcp_retransmit_skb(). It was discovered that a local unprivileged attacker could use a specially crafted sequence of system calls to trigger either a kernel crash in __tcp_retransmit_skb() or use-after-free conditions, which could result in privilege escalation.
[3.10.0-693.21.1.vz7.48.2 to 3.10.0-957.12.2.vz7.96.21] KVM: Out-of-bounds memory access via MMIO ring buffer.
An issue was found in the implementation of the coalesced MMIO write operation in KVM. The indices used to access an MMIO ring buffer could be supplied by a user-space process in the host system. An attacker with access to /dev/kvm could use this flaw to trigger out-of-bounds memory access and crash the host kernel or, potentially, escalate their privileges.
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(133463);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/18");
script_cve_id("CVE-2019-14821", "CVE-2019-15239");
script_name(english:"Virtuozzo 7 : readykernel-patch (VZA-2019-086)");
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 :
- [3.10.0-693.21.1.vz7.48.2 to 3.10.0-957.12.2.vz7.96.21]
Potential kernel crash in __tcp_retransmit_skb(). It
was discovered that a local unprivileged attacker could
use a specially crafted sequence of system calls to
trigger either a kernel crash in __tcp_retransmit_skb()
or use-after-free conditions, which could result in
privilege escalation.
- [3.10.0-693.21.1.vz7.48.2 to 3.10.0-957.12.2.vz7.96.21]
KVM: Out-of-bounds memory access via MMIO ring buffer.
An issue was found in the implementation of the
coalesced MMIO write operation in KVM. The indices used
to access an MMIO ring buffer could be supplied by a
user-space process in the host system. An attacker with
access to /dev/kvm could use this flaw to trigger
out-of-bounds memory access and crash the host kernel
or, potentially, escalate their privileges.
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://virtuozzosupport.force.com/s/article/VZA-2019-086");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-48.2-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ae500723");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-63.3-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?beb8144c");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-64.7-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c61d1e3b");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-73.24-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c312f3a6");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-73.29-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b984849f");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-85.17-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ef5b9f31");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-86.2-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e9257f5d");
# https://readykernel.com/patch/Virtuozzo-7/readykernel-patch-96.21-91.0-1.vl7/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1d05611b");
script_set_attribute(attribute:"solution", value:
"Update the readykernel patch.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-15239");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2019-14821");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"patch_publication_date", value:"2019/11/13");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/02/04");
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) 2020-2022 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-3.10.0-693.21.1.vz7.48.2",
"patch","readykernel-patch-48.2-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-862.11.6.vz7.64.7",
"patch","readykernel-patch-63.3-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-862.20.2.vz7.73.24",
"patch","readykernel-patch-64.7-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-862.20.2.vz7.73.29",
"patch","readykernel-patch-73.24-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-862.9.1.vz7.63.3",
"patch","readykernel-patch-73.29-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-957.10.1.vz7.85.17",
"patch","readykernel-patch-85.17-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-957.12.2.vz7.86.2",
"patch","readykernel-patch-86.2-91.0-1.vl7"
),
make_array(
"kernel","vzkernel-3.10.0-957.12.2.vz7.96.21",
"patch","readykernel-patch-96.21-91.0-1.vl7"
)
);
readykernel_execute_checks(checks:checks, severity:SECURITY_HOLE, release:"Virtuozzo-7");
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14821
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15239
www.nessus.org/u?1d05611b
www.nessus.org/u?ae500723
www.nessus.org/u?b984849f
www.nessus.org/u?beb8144c
www.nessus.org/u?c312f3a6
www.nessus.org/u?c61d1e3b
www.nessus.org/u?e9257f5d
www.nessus.org/u?ef5b9f31
virtuozzosupport.force.com/s/article/VZA-2019-086