Linux Distros Unpatched Vulnerability : CVE-2021-28544

##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(223703);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/20");

  script_cve_id("CVE-2021-28544");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2021-28544");

  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.

  - Apache Subversion SVN authz protected copyfrom paths regression Subversion servers reveal 'copyfrom' paths
    that should be hidden according to configured path-based authorization (authz) rules. When a node has been
    copied from a protected location, users with access to the copy can see the 'copyfrom' path of the
    original. This also reveals the fact that the node was copied. Only the 'copyfrom' path is revealed; not
    its contents. Both httpd and svnserve servers are vulnerable. (CVE-2021-28544)

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-2021-28544");
  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:M/Au:S/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-28544");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/04/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libserf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:mod_dav_svn");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-subversion");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion-gnome");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion-javahl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:subversion-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:utf8proc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libserf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mod_dav_svn");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3-subversion");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion-gnome");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion-javahl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:subversion-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:utf8proc");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
  script_require_keys("Host/OS/identifier", "Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  exit(0);
}

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/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "libserf"},
          {"reference": "mod_dav_svn"},
          {"reference": "python3-subversion"},
          {"reference": "subversion"},
          {"reference": "subversion-devel"},
          {"reference": "subversion-gnome"},
          {"reference": "subversion-javahl"},
          {"reference": "subversion-libs"},
          {"reference": "subversion-perl"},
          {"reference": "subversion-tools"},
          {"reference": "utf8proc"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "libserf"},
          {"reference": "mod_dav_svn"},
          {"reference": "python3-subversion"},
          {"reference": "subversion"},
          {"reference": "subversion-devel"},
          {"reference": "subversion-gnome"},
          {"reference": "subversion-javahl"},
          {"reference": "subversion-libs"},
          {"reference": "subversion-perl"},
          {"reference": "subversion-tools"},
          {"reference": "utf8proc"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "mod_dav_svn"},
          {"reference": "python3-subversion"},
          {"reference": "subversion"},
          {"reference": "subversion-devel"},
          {"reference": "subversion-gnome"},
          {"reference": "subversion-libs"},
          {"reference": "subversion-perl"},
          {"reference": "subversion-tools"}
        ]
      }
    ]
  }
};

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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}