Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.04 : LedgerSMB vulnerabilities (USN-7647-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7647-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(242338);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/18");

  script_cve_id(
    "CVE-2021-3693",
    "CVE-2021-3694",
    "CVE-2021-3731",
    "CVE-2021-3882",
    "CVE-2024-23831"
  );
  script_xref(name:"USN", value:"7647-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.04 : LedgerSMB vulnerabilities (USN-7647-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.04 host has a package installed that is
affected by multiple vulnerabilities as referenced in the USN-7647-1 advisory.

    It was discovered that LedgerSMB did not check the origin of HTML fragments. An attacker could possibly
    use this issue to send a maliciously crafted URL to the server and obtain sensitive information, or
    execute arbitrary code. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04.
    (CVE-2021-3693)

    It was discovered that LedgerSMB did not properly encode HTML error messages. An attacker could possibly
    use this issue to send a maliciously crafted URL to the server and obtain sensitive information, or
    execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2021-3694)

    It was discovered that LedgerSMB did not guard against discrete link redirections. An attacker could
    possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS and
    Ubuntu 18.04 LTS. (CVE-2021-3731)

    It was discovered that LedgerSMB did not properly set the 'Secure' attribute during HTTPS sessions. If a
    user were tricked into using an unencrypted connection, an attacker could possibly use this issue to
    obtain sensitive information. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04
    LTS, and Ubuntu 25.04. (CVE-2021-3882)

    It was discovered that LedgerSMB could create admin accounts via a URL. If an admin were tricked into
    clicking a maliciously crafted URL, an attacker could possibly use this issue to achieve privilege
    escalation. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu
    25.04. (CVE-2024-23831)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-7647-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected ledgersmb package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:R/S:C/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-2021-3694");

  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:"2021/08/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ledgersmb");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2025 Canonical, Inc. / NASL script (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '25.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04 / 22.04 / 24.04 / 25.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) 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, 'Ubuntu', cpu);
var ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '16.04', 'pkgname': 'ledgersmb', 'pkgver': '1.3.46-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-3731']},
    {'osver': '18.04', 'pkgname': 'ledgersmb', 'pkgver': '1.4.42+ds-1ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-3694', 'CVE-2021-3731']},
    {'osver': '20.04', 'pkgname': 'ledgersmb', 'pkgver': '1.6.9+ds-1ubuntu0.1+esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2021-3882', 'CVE-2024-23831']},
    {'osver': '22.04', 'pkgname': 'ledgersmb', 'pkgver': '1.6.33+ds-1ubuntu0.1', 'ubuntu_pro': FALSE, 'cves': ['CVE-2021-3693', 'CVE-2021-3882', 'CVE-2024-23831']},
    {'osver': '24.04', 'pkgname': 'ledgersmb', 'pkgver': '1.6.33+ds-2.1ubuntu0.1', 'ubuntu_pro': FALSE, 'cves': ['CVE-2021-3693', 'CVE-2021-3882', 'CVE-2024-23831']},
    {'osver': '25.04', 'pkgname': 'ledgersmb', 'pkgver': '1.6.33+ds-2.2ubuntu0.25.04.1', 'ubuntu_pro': FALSE, 'cves': ['CVE-2021-3693', 'CVE-2021-3882', 'CVE-2024-23831']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ledgersmb');
}