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nessusThis script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.TENABLE_OT_SIEMENS_CVE-2021-41991.NASL
HistoryApr 28, 2022 - 12:00 a.m.

Siemens SIMATIC NET CP, SINEMA & SCALANCE Integer Overflow (CVE-2021-41991)

2022-04-2800:00:00
This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
13

8 High

AI Score

Confidence

High

The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
##

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

if (description)
{
  script_id(500650);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/31");

  script_cve_id("CVE-2021-41991");
  script_xref(name:"DSA", value:"4989");
  script_xref(name:"FEDORA", value:"2021-b3df83339e");
  script_xref(name:"FEDORA", value:"2021-0b37146973");
  script_xref(name:"FEDORA", value:"2021-95fab6a482");

  script_name(english:"Siemens SIMATIC NET CP, SINEMA & SCALANCE Integer Overflow (CVE-2021-41991)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The in-memory certificate cache in strongSwan before 5.9.4 has a
remote integer overflow upon receiving many requests with different
certificates to fill the cache and later trigger the replacement of
cache entries. The code attempts to select a less-often-used cache
entry by means of a random number generator, but this is not done
correctly. Remote code execution might be a slight possibility.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?845a2df0");
  script_set_attribute(attribute:"see_also", value:"https://github.com/strongswan/strongswan/releases/tag/5.9.4");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2021/dsa-4989");
  script_set_attribute(attribute:"see_also", value:"https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html");
  # https://lists.fedoraproject.org/archives/list/[email protected]/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cd6b6abd");
  # https://lists.fedoraproject.org/archives/list/[email protected]/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ea295ec8");
  # https://lists.fedoraproject.org/archives/list/[email protected]/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d5453363");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:N/I:N/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-2021-41991");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(190);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/28");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:cp_1543-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_sc622-2c_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_sc632-2c_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_sc636-2c_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_sc642-2c_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_sc646-2c_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1242-7_gprs_v2_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1243-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1243-7_lte%2fus_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1542sp-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1542sp-1_irc_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_cp_1543sp-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_net_cp1243-7_lte_eu_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_net_cp_1243-8_irc_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_net_cp_1545-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_net_cp_1543-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_s7-1200_cp_1243-1_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:siplus_s7-1200_cp_1243-1_rail_firmware:-");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Siemens");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

var asset = tenable_ot::assets::get(vendor:'Siemens');

var vuln_cpes = {
    "cpe:/o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:-" :
        {"family" : "ET200", "versionEndExcluding" : "2.2.28"},
    "cpe:/o:siemens:simatic_cp_1243-1_firmware:-" :
        {"family" : "S71200", "versionEndExcluding" : "3.3.46"},
    "cpe:/o:siemens:simatic_cp_1242-7_gprs_v2_firmware:-" :
        {"family" : "S71200", "versionEndExcluding" : "3.3.46"},
    "cpe:/o:siemens:simatic_net_cp_1243-8_irc_firmware:-" :
        {"family" : "S71200", "versionEndExcluding" : "3.3.46"},
    "cpe:/o:siemens:scalance_sc632-2c_firmware:-" :
        {"family" : "SCALANCES"},
    "cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:-" :
        {"family" : "ET200", "versionEndExcluding" : "2.2.28"},
    "cpe:/o:siemens:cp_1543-1_firmware:-" :
        {"family" : "S71500", "versionEndExcluding" : "2.2.28"},
    "cpe:/o:siemens:simatic_net_cp_1545-1_firmware:-" :
        {"family" : "S71500", "versionEndExcluding" : "1.1"},
    "cpe:/o:siemens:simatic_cp_1543sp-1_firmware:-" :
        {"family" : "S71500", "versionEndExcluding" : "2.2.28"},
    "cpe:/o:siemens:simatic_net_cp1243-7_lte_eu_firmware:-" :
        {"family" : "S71200", "versionEndExcluding" : "3.3.46"},
    "cpe:/o:siemens:simatic_cp_1243-7_lte%2fus_firmware:-" :
        {"family" : "S71200", "versionEndExcluding" : "3.3.46"},
    "cpe:/o:siemens:simatic_cp_1542sp-1_firmware:-" :
        {"family" : "S71500", "versionEndExcluding" : "2.2.28"},
    "cpe:/o:siemens:scalance_sc636-2c_firmware:-" :
        {"family" : "SCALANCES"},
    "cpe:/o:siemens:simatic_cp_1542sp-1_irc_firmware:-" :
        {"family" : "S71500", "versionEndExcluding" : "2.2.28"},
    "cpe:/o:siemens:scalance_sc642-2c_firmware:-" :
        {"family" : "SCALANCES"},
    "cpe:/o:siemens:scalance_sc646-2c_firmware" :
        {"versionEndExcluding" : "2.3", "family" : "SCALANCES"},
    "cpe:/o:siemens:scalance_sc622-2c_firmware:-" :
        {"family" : "SCALANCES"},
    "cpe:/o:siemens:siplus_s7-1200_cp_1243-1_rail_firmware:-" :
        {"family" : "S71200"},
    "cpe:/o:siemens:siplus_s7-1200_cp_1243-1_firmware:-" :
        {"family" : "S71200"},
    "cpe:/o:siemens:siplus_net_cp_1543-1_firmware:-" :
        {"family" : "S71500"},
    "cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:-" :
        {"family" : "ET200"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);

8 High

AI Score

Confidence

High

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