Lucene search

K
nessusThis script is Copyright (C) 2022-2024 and is owned by Tenable, Inc. or an Affiliate thereof.SUSE_SU-2022-2574-1.NASL
HistoryAug 02, 2022 - 12:00 a.m.

SUSE SLES12 Security Update : xen (SUSE-SU-2022:2574-1)

2022-08-0200:00:00
This script is Copyright (C) 2022-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
32

7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

7.9 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

46.8%

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:2574-1 advisory.

  • Incomplete cleanup of multi-core shared buffers for some Intel® Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2022-21123)

  • Incomplete cleanup of microarchitectural fill buffers on some Intel® Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2022-21125)

  • Incomplete cleanup in specific special register write operations for some Intel® Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2022-21166)

  • Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially leading to information disclosure. (CVE-2022-23825)

  • 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)

  • Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions. (CVE-2022-29900)

  • insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary. (CVE-2022-33745)

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-2022:2574-1. The text itself
# is copyright (C) SUSE.
##

include('compat.inc');

if (description)
{
  script_id(163720);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/16");

  script_cve_id(
    "CVE-2022-21123",
    "CVE-2022-21125",
    "CVE-2022-21166",
    "CVE-2022-23825",
    "CVE-2022-26362",
    "CVE-2022-26363",
    "CVE-2022-26364",
    "CVE-2022-29900",
    "CVE-2022-33745"
  );
  script_xref(name:"SuSE", value:"SUSE-SU-2022:2574-1");
  script_xref(name:"CEA-ID", value:"CEA-2022-0026");

  script_name(english:"SUSE SLES12 Security Update : xen (SUSE-SU-2022:2574-1)");

  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 SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in
the SUSE-SU-2022:2574-1 advisory.

  - Incomplete cleanup of multi-core shared buffers for some Intel(R) Processors may allow an authenticated
    user to potentially enable information disclosure via local access. (CVE-2022-21123)

  - Incomplete cleanup of microarchitectural fill buffers on some Intel(R) Processors may allow an
    authenticated user to potentially enable information disclosure via local access. (CVE-2022-21125)

  - Incomplete cleanup in specific special register write operations for some Intel(R) Processors may allow an
    authenticated user to potentially enable information disclosure via local access. (CVE-2022-21166)

  - Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially
    leading to information disclosure. (CVE-2022-23825)

  - 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)

  - Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution
    under certain microarchitecture-dependent conditions. (CVE-2022-29900)

  - insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels
    unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was
    moved inside a function in Xen. This code movement missed a variable changing meaning / value between old
    and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition,
    omitting flushes where such are necessary. (CVE-2022-33745)

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://bugzilla.suse.com/1200549");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1201394");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1201469");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-21123");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-21125");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-21166");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-23825");
  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");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-29900");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2022-33745");
  # https://lists.suse.com/pipermail/sle-security-updates/2022-July/011700.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a30aaeb7");
  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:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-26364");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-33745");

  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:"2021/12/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/07/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/08/02");

  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-doc-html");
  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-libs-32bit");
  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:"cpe:/o:novell:suse_linux:12");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"SuSE Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022-2024 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)\d+)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'SUSE');
os_ver = os_ver[1];
if (! preg(pattern:"^(SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES12', '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 == "SLES12" && (! preg(pattern:"^(3)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES12 SP3", os_ver + " SP" + service_pack);

var pkgs = [
    {'reference':'xen-4.9.4_30-3.106.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.3']},
    {'reference':'xen-doc-html-4.9.4_30-3.106.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.3']},
    {'reference':'xen-libs-32bit-4.9.4_30-3.106.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.3']},
    {'reference':'xen-libs-4.9.4_30-3.106.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.3']},
    {'reference':'xen-tools-4.9.4_30-3.106.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.3']},
    {'reference':'xen-tools-domU-4.9.4_30-3.106.1', 'sp':'3', 'cpu':'x86_64', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.3']}
];

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;
        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)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'xen / xen-doc-html / xen-libs / xen-libs-32bit / xen-tools / etc');
}
VendorProductVersionCPE
novellsuse_linuxxenp-cpe:/a:novell:suse_linux:xen
novellsuse_linuxxen-doc-htmlp-cpe:/a:novell:suse_linux:xen-doc-html
novellsuse_linuxxen-libsp-cpe:/a:novell:suse_linux:xen-libs
novellsuse_linuxxen-libs-32bitp-cpe:/a:novell:suse_linux:xen-libs-32bit
novellsuse_linuxxen-toolsp-cpe:/a:novell:suse_linux:xen-tools
novellsuse_linuxxen-tools-domup-cpe:/a:novell:suse_linux:xen-tools-domu
novellsuse_linux12cpe:/o:novell:suse_linux:12

References

7.2 High

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

7.9 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

46.8%