The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:2164-1 advisory.
x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen’s safety, e.g.
PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited. (CVE-2022-26362)
x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen’s safety, e.g. PV guests may not have direct writeable access to pagetables;
updates need auditing by Xen. Unfortunately, Xen’s safety logic doesn’t account for CPU-induced cache non- coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen’s safety logic can incorrectly conclude that the contents of a page is safe.
(CVE-2022-26363, CVE-2022-26364)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2022:2164-1. The text itself
# is copyright (C) SUSE.
##
include('compat.inc');
if (description)
{
script_id(162522);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/13");
script_cve_id("CVE-2022-26362", "CVE-2022-26363", "CVE-2022-26364");
script_xref(name:"SuSE", value:"SUSE-SU-2022:2164-1");
script_name(english:"SUSE SLES15 Security Update : xen (SUSE-SU-2022:2164-1)");
script_set_attribute(attribute:"synopsis", value:
"The remote SUSE host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as
referenced in the SUSE-SU-2022:2164-1 advisory.
- x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition
to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g.
PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately,
the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too
early and creates a window where the guest can re-establish the read/write mapping before writeability is
prohibited. (CVE-2022-26362)
- x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple
CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type
reference count for pages, in addition to a regular reference count. This scheme is used to maintain
invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables;
updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-
coherency; cases where the CPU can cause the content of the cache to be different to the content in main
memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.
(CVE-2022-26363, CVE-2022-26364)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1199965");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1199966");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-26362");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-26363");
script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-26364");
# https://lists.suse.com/pipermail/sle-security-updates/2022-June/011341.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2a0c41da");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
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:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-26364");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2022/06/09");
script_set_attribute(attribute:"patch_publication_date", value:"2022/06/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/06/24");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools-domU");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:xen-tools-xendomains-wait-disk");
script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"SuSE Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");
exit(0);
}
include('rpm.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item("Host/SuSE/release");
if (isnull(os_release) || os_release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
var os_ver = pregmatch(pattern: "^(SLE(S|D)(?:_SAP)?\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES15|SLES_SAP15)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES15 / SLES_SAP15', 'SUSE (' + os_ver + ')');
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'SUSE (' + os_ver + ')', cpu);
var service_pack = get_kb_item("Host/SuSE/patchlevel");
if (isnull(service_pack)) service_pack = "0";
if (os_ver == "SLES15" && (! preg(pattern:"^(2)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES15 SP2", os_ver + " SP" + service_pack);
if (os_ver == "SLES_SAP15" && (! preg(pattern:"^(2)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES_SAP15 SP2", os_ver + " SP" + service_pack);
var pkgs = [
{'reference':'xen-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES_SAP15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-15.2']},
{'reference':'xen-devel-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES_SAP15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-15.2']},
{'reference':'xen-libs-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES_SAP15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-15.2']},
{'reference':'xen-tools-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES_SAP15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-15.2']},
{'reference':'xen-tools-domU-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES_SAP15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-15.2']},
{'reference':'xen-tools-xendomains-wait-disk-4.13.4_10-150200.3.55.1', 'sp':'2', 'release':'SLES_SAP15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-15.2']},
{'reference':'xen-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-ESPOS-release-2', 'sles-release-15.2']},
{'reference':'xen-devel-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-ESPOS-release-2', 'sles-release-15.2']},
{'reference':'xen-libs-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-ESPOS-release-2', 'sles-release-15.2']},
{'reference':'xen-tools-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-ESPOS-release-2', 'sles-release-15.2']},
{'reference':'xen-tools-domU-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-ESPOS-release-2', 'sles-release-15.2']},
{'reference':'xen-tools-xendomains-wait-disk-4.13.4_10-150200.3.55.1', 'sp':'2', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-ESPOS-release-2', 'sles-release-15.2']},
{'reference':'xen-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-LTSS-release-15.2', 'sles-ltss-release-15.2']},
{'reference':'xen-devel-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-LTSS-release-15.2', 'sles-ltss-release-15.2']},
{'reference':'xen-libs-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-LTSS-release-15.2', 'sles-ltss-release-15.2']},
{'reference':'xen-tools-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-LTSS-release-15.2', 'sles-ltss-release-15.2']},
{'reference':'xen-tools-domU-4.13.4_10-150200.3.55.1', 'sp':'2', 'cpu':'x86_64', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-LTSS-release-15.2', 'sles-ltss-release-15.2']},
{'reference':'xen-tools-xendomains-wait-disk-4.13.4_10-150200.3.55.1', 'sp':'2', 'release':'SLES15', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLE_HPC-LTSS-release-15.2', 'sles-ltss-release-15.2']}
];
var ltss_caveat_required = FALSE;
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var exists_check = NULL;
var rpm_spec_vers_cmp = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (reference && _release) {
if (exists_check) {
var check_flag = 0;
foreach var check (exists_check) {
if (!rpm_exists(release:_release, rpm:check)) continue;
if ('ltss' >< tolower(check)) ltss_caveat_required = TRUE;
check_flag++;
}
if (!check_flag) continue;
}
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
}
}
if (flag)
{
var ltss_plugin_caveat = NULL;
if(ltss_caveat_required) ltss_plugin_caveat = '\n' +
'NOTE: This vulnerability check contains fixes that apply to\n' +
'packages only available in SUSE Enterprise Linux Server LTSS\n' +
'repositories. Access to these package security updates require\n' +
'a paid SUSE LTSS subscription.\n';
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get() + ltss_plugin_caveat
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc');
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26362
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26363
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26364
www.nessus.org/u?2a0c41da
bugzilla.suse.com/1199965
bugzilla.suse.com/1199966
www.suse.com/security/cve/CVE-2022-26362
www.suse.com/security/cve/CVE-2022-26363
www.suse.com/security/cve/CVE-2022-26364