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nessusThis script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.REDHAT-RHSA-2020-3875.NASL
HistorySep 29, 2020 - 12:00 a.m.

RHEL 7 : tigervnc (RHSA-2020:3875)

2020-09-2900:00:00
This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
14

CVSS2

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

7.2

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

7.5

Confidence

High

EPSS

0.006

Percentile

79.3%

JSON

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3875 advisory.

  • tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder (CVE-2019-15691)

  • tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks (CVE-2019-15692)

  • tigervnc: Heap buffer overflow in TightDecoder::FilterGradient (CVE-2019-15693)

  • tigervnc: Heap buffer overflow in DecodeManager::decodeRect (CVE-2019-15694)

  • tigervnc: Stack buffer overflow in CMsgReader::readSetCursor (CVE-2019-15695)

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 descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:3875. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(141028);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/16");

  script_cve_id(
    "CVE-2019-15691",
    "CVE-2019-15692",
    "CVE-2019-15693",
    "CVE-2019-15694",
    "CVE-2019-15695"
  );
  script_xref(name:"RHSA", value:"2020:3875");

  script_name(english:"RHEL 7 : tigervnc (RHSA-2020:3875)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:3875 advisory.

  - tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder (CVE-2019-15691)

  - tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks
    (CVE-2019-15692)

  - tigervnc: Heap buffer overflow in TightDecoder::FilterGradient (CVE-2019-15693)

  - tigervnc: Heap buffer overflow in DecodeManager::decodeRect (CVE-2019-15694)

  - tigervnc: Stack buffer overflow in CMsgReader::readSetCursor (CVE-2019-15695)

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://access.redhat.com/security/cve/CVE-2019-15691");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2019-15692");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2019-15693");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2019-15694");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2019-15695");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:3875");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1789527");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1789908");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1790313");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1790315");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/1790318");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/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-2019-15695");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(121, 122, 672);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/12/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-icons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-license");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server-applet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:tigervnc-server-module");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '7')) audit(AUDIT_OS_NOT, 'Red Hat 7.x', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
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      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/optional/source/SRPMS',
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/os',
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/source/SRPMS',
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/supplementary/debug',
      'content/dist/rhel-alt/server/7/7Server/power9/ppc64le/supplementary/source/SRPMS',
      'content/dist/rhel-alt/server/7/7Server/system-z-a/s390x/debug',
      'content/dist/rhel-alt/server/7/7Server/system-z-a/s390x/optional/debug',
      'content/dist/rhel-alt/server/7/7Server/system-z-a/s390x/optional/os',
      'content/dist/rhel-alt/server/7/7Server/system-z-a/s390x/optional/source/SRPMS',
      'content/dist/rhel-alt/server/7/7Server/system-z-a/s390x/os',
      'content/dist/rhel-alt/server/7/7Server/system-z-a/s390x/source/SRPMS',
      'content/dist/rhel/client/7/7Client/x86_64/debug',
      'content/dist/rhel/client/7/7Client/x86_64/optional/debug',
      'content/dist/rhel/client/7/7Client/x86_64/optional/os',
      'content/dist/rhel/client/7/7Client/x86_64/optional/source/SRPMS',
      'content/dist/rhel/client/7/7Client/x86_64/oracle-java-rm/os',
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      'content/dist/rhel/client/7/7Client/x86_64/supplementary/source/SRPMS',
      'content/dist/rhel/computenode/7/7ComputeNode/x86_64/debug',
      'content/dist/rhel/computenode/7/7ComputeNode/x86_64/optional/debug',
      'content/dist/rhel/computenode/7/7ComputeNode/x86_64/optional/os',
      'content/dist/rhel/computenode/7/7ComputeNode/x86_64/optional/source/SRPMS',
      'content/dist/rhel/computenode/7/7ComputeNode/x86_64/oracle-java-rm/os',
      'content/dist/rhel/computenode/7/7ComputeNode/x86_64/os',
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      'content/dist/rhel/power-le/7/7Server/ppc64le/sap/os',
      'content/dist/rhel/power-le/7/7Server/ppc64le/sap/source/SRPMS',
      'content/dist/rhel/power-le/7/7Server/ppc64le/source/SRPMS',
      'content/dist/rhel/power-le/7/7Server/ppc64le/supplementary/debug',
      'content/dist/rhel/power-le/7/7Server/ppc64le/supplementary/os',
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      'content/dist/rhel/server/7/7Server/x86_64/debug',
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      'content/dist/rhel/server/7/7Server/x86_64/nfv/debug',
      'content/dist/rhel/server/7/7Server/x86_64/nfv/os',
      'content/dist/rhel/server/7/7Server/x86_64/nfv/source/SRPMS',
      'content/dist/rhel/server/7/7Server/x86_64/optional/debug',
      'content/dist/rhel/server/7/7Server/x86_64/optional/os',
      'content/dist/rhel/server/7/7Server/x86_64/optional/source/SRPMS',
      'content/dist/rhel/server/7/7Server/x86_64/oracle-java-rm/os',
      'content/dist/rhel/server/7/7Server/x86_64/os',
      'content/dist/rhel/server/7/7Server/x86_64/resilientstorage/debug',
      'content/dist/rhel/server/7/7Server/x86_64/resilientstorage/os',
      'content/dist/rhel/server/7/7Server/x86_64/resilientstorage/source/SRPMS',
      'content/dist/rhel/server/7/7Server/x86_64/rt/debug',
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      'content/fastrack/rhel/system-z/7/s390x/source/SRPMS',
      'content/fastrack/rhel/workstation/7/x86_64/debug',
      'content/fastrack/rhel/workstation/7/x86_64/optional/debug',
      'content/fastrack/rhel/workstation/7/x86_64/optional/os',
      'content/fastrack/rhel/workstation/7/x86_64/optional/source/SRPMS',
      'content/fastrack/rhel/workstation/7/x86_64/os',
      'content/fastrack/rhel/workstation/7/x86_64/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'tigervnc-1.8.0-21.el7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-1.8.0-21.el7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-1.8.0-21.el7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-1.8.0-21.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-icons-1.8.0-21.el7', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-license-1.8.0-21.el7', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.8.0-21.el7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.8.0-21.el7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.8.0-21.el7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-1.8.0-21.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-applet-1.8.0-21.el7', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-minimal-1.8.0-21.el7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-minimal-1.8.0-21.el7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-minimal-1.8.0-21.el7', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-minimal-1.8.0-21.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-module-1.8.0-21.el7', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-module-1.8.0-21.el7', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'tigervnc-server-module-1.8.0-21.el7', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_array['pkgs'] ) {
    var reference = NULL;
    var _release = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var epoch = NULL;
    var allowmaj = NULL;
    var exists_check = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
        rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (empty_or_null(applicable_repo_urls)) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get() + redhat_report_package_caveat();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'tigervnc / tigervnc-icons / tigervnc-license / tigervnc-server / etc');
}
VendorProductVersionCPE
redhatenterprise_linux7cpe:/o:redhat:enterprise_linux:7
redhatenterprise_linuxtigervncp-cpe:/a:redhat:enterprise_linux:tigervnc
redhatenterprise_linuxtigervnc-iconsp-cpe:/a:redhat:enterprise_linux:tigervnc-icons
redhatenterprise_linuxtigervnc-licensep-cpe:/a:redhat:enterprise_linux:tigervnc-license
redhatenterprise_linuxtigervnc-serverp-cpe:/a:redhat:enterprise_linux:tigervnc-server
redhatenterprise_linuxtigervnc-server-appletp-cpe:/a:redhat:enterprise_linux:tigervnc-server-applet
redhatenterprise_linuxtigervnc-server-minimalp-cpe:/a:redhat:enterprise_linux:tigervnc-server-minimal
redhatenterprise_linuxtigervnc-server-modulep-cpe:/a:redhat:enterprise_linux:tigervnc-server-module

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CVSS2

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

7.2

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

7.5

Confidence

High

EPSS

0.006

Percentile

79.3%

JSON
Related for REDHAT-RHSA-2020-3875.NASL
amazon3nessus24openvas12redhat2suse1centos1oraclelinux2mageia1gentoo1nvd5cvelist5debiancve5veracode5ubuntucve5cve5redhatcve5prion5osv5