Slackware Linux 14.0 / 14.1 / 14.2 / current polkit Vulnerability (SSA:2022-025-02)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
#
# The descriptive text and package checks in this plugin were
# extracted from Slackware Security Advisory SSA:2022-025-02. The text
# itself is copyright (C) Slackware Linux, Inc.
##

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

if (description)
{
  script_id(157116);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/01/16");

  script_cve_id("CVE-2021-4034");
  script_xref(name:"IAVA", value:"2022-A-0055");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/07/18");

  script_name(english:"Slackware Linux 14.0 / 14.1 / 14.2 / current polkit  Vulnerability (SSA:2022-025-02)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Slackware Linux host is missing a security update to polkit.");
  script_set_attribute(attribute:"description", value:
"The version of polkit installed on the remote host is prior to 0.105 / 0.113 / 0.120. It is, therefore, affected by a
vulnerability as referenced in the SSA:2022-025-02 advisory.

  - A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is
    a setuid tool designed to allow unprivileged users to run commands as privileged users according
    predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly
    and ends trying to execute environment variables as commands. An attacker can leverage this by crafting
    environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully
    executed the attack can cause a local privilege escalation given unprivileged users administrative rights
    on the target machine. (CVE-2021-4034)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"solution", value:
"Upgrade the affected polkit package.");
  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:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-4034");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Local Privilege Escalation in polkits pkexec');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:"CANVAS");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/01/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/01/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:slackware:slackware_linux:polkit");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:slackware:slackware_linux:14.2");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Slackware 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/Slackware/release", "Host/Slackware/packages");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("slackware.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Slackware/release")) audit(AUDIT_OS_NOT, "Slackware");
if (!get_kb_item("Host/Slackware/packages")) 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Slackware", cpu);

var flag = 0;
var constraints = [
    { 'fixed_version' : '0.105', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : '14.0', 'service_pack' : '5_slack14.0', 'arch' : 'i486' },
    { 'fixed_version' : '0.105', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : '14.0', 'service_pack' : '5_slack14.0', 'arch' : 'x86_64' },
    { 'fixed_version' : '0.105', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : '14.1', 'service_pack' : '5_slack14.1', 'arch' : 'i486' },
    { 'fixed_version' : '0.105', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : '14.1', 'service_pack' : '5_slack14.1', 'arch' : 'x86_64' },
    { 'fixed_version' : '0.113', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : '14.2', 'service_pack' : '4_slack14.2', 'arch' : 'i586' },
    { 'fixed_version' : '0.113', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : '14.2', 'service_pack' : '4_slack14.2', 'arch' : 'x86_64' },
    { 'fixed_version' : '0.120', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : 'current', 'service_pack' : '2', 'arch' : 'i586' },
    { 'fixed_version' : '0.120', 'product' : 'polkit', 'os_name' : 'Slackware Linux', 'os_version' : 'current', 'service_pack' : '2', 'arch' : 'x86_64' }
];

foreach constraint (constraints) {
    var pkg_arch = constraint['arch'];
    var arch = NULL;
    if (pkg_arch == "x86_64") {
        arch = pkg_arch;
    }
    if (slackware_check(osver:constraint['os_version'],
                        arch:arch,
                        pkgname:constraint['product'],
                        pkgver:constraint['fixed_version'],
                        pkgarch:pkg_arch,
                        pkgnum:constraint['service_pack'])) flag++;
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : slackware_report_get()
  );
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");