TencentOS Server 3: python38 (TSSA-2022:0192)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2022:0192.
##

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

if (description)
{
  script_id(239882);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/05");

  script_cve_id(
    "CVE-2021-29921",
    "CVE-2021-3426",
    "CVE-2021-3733",
    "CVE-2021-3737"
  );

  script_name(english:"TencentOS Server 3: python38 (TSSA-2022:0192)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 3 host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0192 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

      CVE-2021-3426:
      There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince
    another local or adjacent user to start a pydoc server could access the server and use it to disclose
    sensitive information belonging to the other user that they would not normally be able to access. The
    highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9,
    Python versions before 3.9.3 and Python versions before 3.10.0a7.

      CVE-2021-3733:
      There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP
    server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of
    Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the
    server to the client. The greatest threat that this flaw poses is to application availability.

      CVE-2021-3737:
      A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may
    allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop,
    consuming CPU time. The highest threat from this vulnerability is to system availability.

      CVE-2021-29921:
      In Python before 3,9,5, the ipaddress library mishandles leading zero characters in the octets of an IP
    address string. This (in some situations) allows attackers to bypass access control that is based on IP
    addresses.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

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://mirrors.tencent.com/tlinux/errata/tssa-20220192.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/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-2021-29921");

  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:"2022/11/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/11/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:python38");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/etc/os-release", "Host/TencentOS/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'TencentOS' >!< os_product) audit(AUDIT_OS_NOT, 'TencentOS');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'TencentOS');
if (! preg(pattern:"^3([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 3.x', 'TencentOS ' + os_version);

if (!get_kb_item('Host/TencentOS/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, 'TencentOS', cpu);

var constraints = [
  {
    'release': '3',
    'pkgs': [
      {'reference':'python38-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-debug-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-debug-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-debuginfo-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-debuginfo-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-debugsource-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-debugsource-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-devel-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-devel-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-idle-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-idle-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-libs-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-libs-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-rpm-macros-3.8.12-1.module+el8.6.0+164+f1b47836', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-test-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-test-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-tkinter-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'python38-tkinter-3.8.12-1.module+el8.6.0+164+f1b47836', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    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 (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) 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, 'python38 / python38-debug / python38-debuginfo / etc');
}