CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS
Percentile
14.2%
According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial of service vulnerability. Only x86 systems are affected.
Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(122873);
script_version("1.5");
script_cvs_date("Date: 2019/11/08");
script_cve_id("CVE-2019-17344");
script_name(english:"Xen Project Preemtible Linear Pagetable Denial of Service Vulnerability (XSA-290)");
script_summary(english:"Checks 'xl info' output for the Xen hypervisor version.");
script_set_attribute(attribute:"synopsis", value:
"The remote Xen hypervisor installation is missing a security update.");
script_set_attribute(attribute:"description", value:
"According to its self-reported version number, the Xen hypervisor
installed on the remote host is affected by a denial of service
vulnerability. Only x86 systems are affected.
Note that Nessus has checked the changeset versions based on the
xen.git change log. Nessus did not check guest hardware configurations
or if patches were applied manually to the source code before a
recompile and reinstall.");
script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/xsa/advisory-290.html");
script_set_attribute(attribute:"see_also", value:"https://xenbits.xen.org/gitweb/?p=xen.git;a=summary");
script_set_attribute(attribute:"solution", value:
"Apply the appropriate patch according to the vendor advisory.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:N/I:N/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:N/I:N/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-2019-17344");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/05");
script_set_attribute(attribute:"patch_publication_date", value:"2019/03/05");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/15");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:xen:xen");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("xen_server_detect.nbin");
script_require_keys("installed_sw/Xen Hypervisor", "Settings/ParanoidReport");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("install_func.inc");
include("misc_func.inc");
app_name = "Xen Hypervisor";
install = get_single_install(app_name:app_name);
if (report_paranoia < 2) audit(AUDIT_PARANOID);
version = install['version'];
display_version = install['display_version'];
path = install['path'];
managed_status = install['Managed status'];
changeset = install['Changeset'];
if (!empty_or_null(changeset))
display_version += " (changeset " + changeset + ")";
# Installations that are vendor-managed are handled by OS-specific local package checks
if (managed_status == "managed")
audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path);
fixes['4.7']['fixed_ver'] = '4.7.6';
fixes['4.7']['fixed_ver_display'] = '4.7.6 (changeset c1f397d)';
fixes['4.7']['affected_ver_regex'] = '^4\\.7\\.';
fixes['4.7']['affected_changesets'] = make_list("516671a", "384a6dd",
"a1500d4", "362cca8", "eeea811", "710cc09", "ab6d56c", "4f3858f",
"045d4f7", "2b3463f", "efe21ad", "9c82759", "3d3e474", "4e69e43",
"3d33cc6", "3f7b4ec", "7ba1c7d", "87d5aa4", "9b8375a", "da93914",
"0aa4696", "f05a33e", "f440b31", "1a90803", "0abc1ae", "1fdb25a",
"c9641d4", "61c4360", "df66c1c", "59732fd", "3f7fd2b", "bcbd8b9",
"dfee811", "95ff4e1", "ded2a37", "87dba80", "fe028e6", "a51e6a3",
"0e66281", "51d9780", "91ca84c", "bce2dd6", "fa807e2", "97aff08",
"e90e243", "c0e854b", "9858a1f", "a404136", "dc111e9", "0873699", "280a556");
fixes['4.10']['fixed_ver'] = '4.10.4';
fixes['4.10']['fixed_ver_display'] = '4.10.4-pre (changeset 631b902)';
fixes['4.10']['affected_ver_regex'] = '^4\\.10\\.';
fixes['4.10']['affected_changesets'] = make_list("f6f1e94", "b450b20",
"dfc7e3c", "382e4a6", "edbc9b0", "edb80d2");
fixes['4.11']['fixed_ver'] = '4.11.2';
fixes['4.11']['fixed_ver_display'] = '4.11.2-pre (changeset 92227e2)';
fixes['4.11']['affected_ver_regex'] = '^4\\.11\\.';
fixes['4.11']['affected_changesets'] = make_list("4835974", "be58f86",
"4298abd", "4f785ea", "1028304", "87f51bf", "dd492b8", "e2e3a1d",
"850ca94", "514dccd", "e202feb", "1986728", "2cd833d", "de09411",
"dd914e4", "63d7113", "af25f52", "91f2ad7", "0b2be0b", "7d1bd98",
"d8b2418", "bf608fd");
fix = NULL;
foreach ver_branch (keys(fixes))
{
if (version =~ fixes[ver_branch]['affected_ver_regex'])
{
ret = ver_compare(ver:version, fix:fixes[ver_branch]['fixed_ver']);
if (ret < 0)
fix = fixes[ver_branch]['fixed_ver_display'];
else if (ret == 0)
{
if (empty_or_null(changeset))
fix = fixes[ver_branch]['fixed_ver_display'];
else
foreach affected_changeset (fixes[ver_branch]['affected_changesets'])
if (changeset == affected_changeset)
fix = fixes[ver_branch]['fixed_ver_display'];
}
}
}
if (empty_or_null(fix))
audit(AUDIT_INST_PATH_NOT_VULN, app_name, display_version, path);
items = make_array(
"Installed version", display_version,
"Fixed version", fix,
"Path", path
);
order = make_list("Path", "Installed version", "Fixed version");
report = report_items_str(report_items:items, ordered_fields:order) + '\n';
security_report_v4(port:0, extra:report, severity:SECURITY_WARNING);
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
EPSS
Percentile
14.2%