Linux Distros Unpatched Vulnerability : CVE-2021-42574

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
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  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/27");

  script_cve_id("CVE-2021-42574");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2021-42574");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - An issue was discovered in the Bidirectional Algorithm in the Unicode Specification through 14.0. It
    permits the visual reordering of characters via control sequences, which can be used to craft source code
    that renders different logic than the logical ordering of tokens ingested by compilers and interpreters.
    Adversaries can leverage this to encode source code for compilers accepting Unicode such that targeted
    vulnerabilities are introduced invisibly to human reviewers. NOTE: the Unicode Consortium offers the
    following alternative approach to presenting this concern. An issue is noted in the nature of
    international text that can affect applications that implement support for The Unicode Standard and the
    Unicode Bidirectional Algorithm (all versions). Due to text display behavior when text includes left-to-
    right and right-to-left characters, the visual order of tokens may be different from their logical order.
    Additionally, control characters needed to fully support the requirements of bidirectional text can
    further obfuscate the logical order of tokens. Unless mitigated, an adversary could craft source code such
    that the ordering of tokens perceived by human reviewers does not match what will be processed by a
    compiler/interpreter/etc. The Unicode Consortium has documented this class of vulnerability in its
    document, Unicode Technical Report #36, Unicode Security Considerations. The Unicode Consortium also
    provides guidance on mitigations for this class of issues in Unicode Technical Standard #39, Unicode
    Security Mechanisms, and in Unicode Standard Annex #31, Unicode Identifier and Pattern Syntax. Also, the
    BIDI specification allows applications to tailor the implementation in ways that can mitigate misleading
    visual reordering in program text; see HL4 in Unicode Standard Annex #9, Unicode Bidirectional Algorithm.
    (CVE-2021-42574)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2021-42574");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-42574");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-42574");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
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  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

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}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
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          {"reference": "libstd-rust-dev-windows"},
          {"reference": "rust-doc"},
          {"reference": "rust-gdb"},
          {"reference": "rust-lldb"},
          {"reference": "rust-src"},
          {"reference": "rustc"}
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      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
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          {"reference": "gcc-go"},
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          {"reference": "libstdc++-docs"},
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  "Red Hat Enterprise Linux-7": {
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  "CentOS Linux-8": {
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    "constraints": [
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        "pkgs": [
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          {"reference": "gcc-toolset-9-binutils"},
          {"reference": "gcc-toolset-9-binutils-devel"},
          {"reference": "gcc-toolset-9-gcc"},
          {"reference": "gcc-toolset-9-gcc-c++"},
          {"reference": "gcc-toolset-9-gcc-gdb-plugin"},
          {"reference": "gcc-toolset-9-gcc-gfortran"},
          {"reference": "gcc-toolset-9-gcc-plugin-devel"},
          {"reference": "gcc-toolset-9-libasan-devel"},
          {"reference": "gcc-toolset-9-libatomic-devel"},
          {"reference": "gcc-toolset-9-libitm-devel"},
          {"reference": "gcc-toolset-9-liblsan-devel"},
          {"reference": "gcc-toolset-9-libquadmath-devel"},
          {"reference": "gcc-toolset-9-libstdc++-devel"},
          {"reference": "gcc-toolset-9-libstdc++-docs"},
          {"reference": "gcc-toolset-9-libtsan-devel"},
          {"reference": "gcc-toolset-9-libubsan-devel"},
          {"reference": "go-toolset"},
          {"reference": "golang"},
          {"reference": "golang-bin"},
          {"reference": "golang-docs"},
          {"reference": "golang-misc"},
          {"reference": "golang-race"},
          {"reference": "golang-src"},
          {"reference": "golang-tests"},
          {"reference": "mingw-binutils"},
          {"reference": "mingw-binutils-generic"},
          {"reference": "mingw32-binutils"},
          {"reference": "mingw64-binutils"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gcc-toolset-9-annobin"},
          {"reference": "gcc-toolset-9-binutils"},
          {"reference": "gcc-toolset-9-binutils-devel"},
          {"reference": "gcc-toolset-9-gcc"},
          {"reference": "gcc-toolset-9-gcc-c++"},
          {"reference": "gcc-toolset-9-gcc-gdb-plugin"},
          {"reference": "gcc-toolset-9-gcc-gfortran"},
          {"reference": "gcc-toolset-9-gcc-plugin-devel"},
          {"reference": "gcc-toolset-9-libasan-devel"},
          {"reference": "gcc-toolset-9-libatomic-devel"},
          {"reference": "gcc-toolset-9-libitm-devel"},
          {"reference": "gcc-toolset-9-liblsan-devel"},
          {"reference": "gcc-toolset-9-libquadmath-devel"},
          {"reference": "gcc-toolset-9-libstdc++-devel"},
          {"reference": "gcc-toolset-9-libstdc++-docs"},
          {"reference": "gcc-toolset-9-libtsan-devel"},
          {"reference": "gcc-toolset-9-libubsan-devel"},
          {"reference": "go-toolset"},
          {"reference": "golang"},
          {"reference": "golang-bin"},
          {"reference": "golang-docs"},
          {"reference": "golang-misc"},
          {"reference": "golang-race"},
          {"reference": "golang-src"},
          {"reference": "golang-tests"},
          {"reference": "mingw-binutils"},
          {"reference": "mingw-binutils-generic"},
          {"reference": "mingw32-binutils"},
          {"reference": "mingw64-binutils"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "go-toolset"},
          {"reference": "golang"},
          {"reference": "golang-bin"},
          {"reference": "golang-docs"},
          {"reference": "golang-misc"},
          {"reference": "golang-race"},
          {"reference": "golang-src"},
          {"reference": "golang-tests"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}