SUSE SLES12 Security Update : spice-vdagent (SUSE-SU-2021:2766-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# SUSE update advisory SUSE-SU-2021:2766-1. The text itself
# is copyright (C) SUSE.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(152654);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/07/13");

  script_cve_id(
    "CVE-2020-25650",
    "CVE-2020-25651",
    "CVE-2020-25652",
    "CVE-2020-25653"
  );
  script_xref(name:"SuSE", value:"SUSE-SU-2021:2766-1");

  script_name(english:"SUSE SLES12 Security Update : spice-vdagent (SUSE-SU-2021:2766-1)");

  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 / SLES_SAP12 host has a package installed that is affected by multiple vulnerabilities as
referenced in the SUSE-SU-2021:2766-1 advisory.

  - A flaw was found in the way the spice-vdagentd daemon handled file transfers from the host system to the
    virtual machine. Any unprivileged local guest user with access to the UNIX domain socket path `/run/spice-
    vdagentd/spice-vdagent-sock` could use this flaw to perform a memory denial of service for spice-vdagentd
    or even other processes in the VM system. The highest threat from this vulnerability is to system
    availability. This flaw affects spice-vdagent versions 0.20 and previous versions. (CVE-2020-25650)

  - A flaw was found in the SPICE file transfer protocol. File data from the host system can end up in full or
    in parts in the client connection of an illegitimate local user in the VM system. Active file transfers
    from other users could also be interrupted, resulting in a denial of service. The highest threat from this
    vulnerability is to data confidentiality as well as system availability. This flaw affects spice-vdagent
    versions 0.20 and prior. (CVE-2020-25651)

  - A flaw was found in the spice-vdagentd daemon, where it did not properly handle client connections that
    can be established via the UNIX domain socket in `/run/spice-vdagentd/spice-vdagent-sock`. Any
    unprivileged local guest user could use this flaw to prevent legitimate agents from connecting to the
    spice-vdagentd daemon, resulting in a denial of service. The highest threat from this vulnerability is to
    system availability. This flaw affects spice-vdagent versions 0.20 and prior. (CVE-2020-25652)

  - A race condition vulnerability was found in the way the spice-vdagentd daemon handled new client
    connections. This flaw may allow an unprivileged local guest user to become the active agent for spice-
    vdagentd, possibly resulting in a denial of service or information leakage from the host. The highest
    threat from this vulnerability is to data confidentiality as well as system availability. This flaw
    affects spice-vdagent versions 0.20 and prior. (CVE-2020-25653)

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/1177780");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1177781");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1177782");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1177783");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-25650");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-25651");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-25652");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2020-25653");
  # https://lists.suse.com/pipermail/sle-security-updates/2021-August/009304.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?33019b27");
  script_set_attribute(attribute:"solution", value:
"Update the affected spice-vdagent package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/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:H/PR:L/UI:N/S:C/C:H/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-25653");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-25651");

  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:"2020/11/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/08/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:spice-vdagent");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");
  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) 2021-2023 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:"^(SLES12|SLES_SAP12)$", string:os_ver)) audit(AUDIT_OS_NOT, 'SUSE SLES12 / SLES_SAP12', '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:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES12 SP5", os_ver + " SP" + service_pack);
if (os_ver == "SLES_SAP12" && (! preg(pattern:"^(5)$", string:service_pack))) audit(AUDIT_OS_NOT, "SLES_SAP12 SP5", os_ver + " SP" + service_pack);

var pkgs = [
    {'reference':'spice-vdagent-0.16.0-8.8.2', 'sp':'5', 'release':'SLES_SAP12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['SLES_SAP-release-12.5']},
    {'reference':'spice-vdagent-0.16.0-8.8.2', 'sp':'5', 'release':'SLES12', 'rpm_spec_vers_cmp':TRUE, 'exists_check':['sles-release-12.5']}
];

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_WARNING,
      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, 'spice-vdagent');
}