Ubuntu 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : libssh vulnerabilities (USN-7619-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7619-1. 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(241506);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/08");

  script_cve_id(
    "CVE-2025-4877",
    "CVE-2025-4878",
    "CVE-2025-5318",
    "CVE-2025-5351",
    "CVE-2025-5372",
    "CVE-2025-5449",
    "CVE-2025-5987"
  );
  script_xref(name:"USN", value:"7619-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : libssh vulnerabilities (USN-7619-1)");

  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 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-7619-1 advisory.

    Ronald Crane discovered that libssh incorrectly handled certain base64 conversions. An attacker could use
    this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2025-4877)

    Ronald Crane discovered that libssh incorrectly handled the privatekey_from_file() function. An attacker
    could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute
    arbitrary code. (CVE-2025-4878)

    Ronald Crane discovered that libssh incorrectly handled certain memory operations in the sftp server. An
    attacker could possibly use this issue to cause libssh to crash, resulting in a denial of service.
    (CVE-2025-5318, CVE-2025-5449)

    Ronald Crane discovered that libssh incorrectly handled exporting keys. An attacker could possibly use
    this issue to cause libssh to crash, resulting in a denial of service. This issue only affected Ubuntu
    24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-5351)

    Ronald Crane discovered that libssh incorrectly handled the ssh_kdf() function. An attacker could use this
    issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.
    (CVE-2025-5372)

    Ronald Crane discovered that libssh incorrectly handled the ChaCha20 cipher. An attacker could possibly
    use this issue to cause libssh to use partially initialized cypher content. This issue only affected
    Ubuntu 24.04 LTS, Ubuntu 24.10, and Ubuntu 25.04. (CVE-2025-5987)

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-7619-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-5318");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:24.10");
  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:libssh-4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssh-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssh-gcrypt-4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssh-gcrypt-dev");
  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");
  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 (! ('22.04' >< os_release || '24.04' >< os_release || '24.10' >< os_release || '25.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04 / 24.10 / 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 pkgs = [
    {'osver': '22.04', 'pkgname': 'libssh-4', 'pkgver': '0.9.6-2ubuntu0.22.04.4', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5372', 'CVE-2025-5449']},
    {'osver': '22.04', 'pkgname': 'libssh-dev', 'pkgver': '0.9.6-2ubuntu0.22.04.4', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5372', 'CVE-2025-5449']},
    {'osver': '22.04', 'pkgname': 'libssh-gcrypt-4', 'pkgver': '0.9.6-2ubuntu0.22.04.4', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5372', 'CVE-2025-5449']},
    {'osver': '22.04', 'pkgname': 'libssh-gcrypt-dev', 'pkgver': '0.9.6-2ubuntu0.22.04.4', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5372', 'CVE-2025-5449']},
    {'osver': '24.04', 'pkgname': 'libssh-4', 'pkgver': '0.10.6-2ubuntu0.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.04', 'pkgname': 'libssh-dev', 'pkgver': '0.10.6-2ubuntu0.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.04', 'pkgname': 'libssh-gcrypt-4', 'pkgver': '0.10.6-2ubuntu0.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.04', 'pkgname': 'libssh-gcrypt-dev', 'pkgver': '0.10.6-2ubuntu0.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.10', 'pkgname': 'libssh-4', 'pkgver': '0.10.6-3ubuntu1.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.10', 'pkgname': 'libssh-dev', 'pkgver': '0.10.6-3ubuntu1.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.10', 'pkgname': 'libssh-gcrypt-4', 'pkgver': '0.10.6-3ubuntu1.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '24.10', 'pkgname': 'libssh-gcrypt-dev', 'pkgver': '0.10.6-3ubuntu1.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '25.04', 'pkgname': 'libssh-4', 'pkgver': '0.11.1-1ubuntu0.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']},
    {'osver': '25.04', 'pkgname': 'libssh-dev', 'pkgver': '0.11.1-1ubuntu0.1', 'cves': ['CVE-2025-4877', 'CVE-2025-4878', 'CVE-2025-5318', 'CVE-2025-5351', 'CVE-2025-5372', 'CVE-2025-5449', 'CVE-2025-5987']}
];

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'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  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, 'libssh-4 / libssh-dev / libssh-gcrypt-4 / libssh-gcrypt-dev');
}