openSUSE 16 Security Update : libssh (openSUSE-SU-2026:21444-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# openSUSE Security Update openSUSE-SU-2026:21444-1. The text itself
# is copyright (C) SUSE.
##

include('compat.inc');

if (description)
{
  script_id(330077);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/03");

  script_cve_id(
    "CVE-2026-15370",
    "CVE-2026-59843",
    "CVE-2026-59844",
    "CVE-2026-59845",
    "CVE-2026-59846",
    "CVE-2026-59847",
    "CVE-2026-59848",
    "CVE-2026-59849",
    "CVE-2026-59850"
  );
  script_xref(name:"IAVA", value:"2026-A-0788");

  script_name(english:"openSUSE 16 Security Update : libssh (openSUSE-SU-2026:21444-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote openSUSE host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the
openSUSE-SU-2026:21444-1 advisory.

    - CVE-2026-15370: stack buffer overflow in SFTP server longname construction (bsc#1272162).
    - CVE-2026-59843: denial of service via zero advertised channel packet size (bsc#1272164).
    - CVE-2026-59844: denial of service via oversized SFTP read length (bsc#1272165).
    - CVE-2026-59845: denial of service via unchecked ProxyCommand fork() failure (bsc#1272166).
    - CVE-2026-59846: information disclosure via ProxyCommand %r username expansion (bsc#1272167).
    - CVE-2026-59847: integrity downgrade via OpenSSL AES-GCM tag verification (bsc#1272168).
    - CVE-2026-59848: denial of service via SFTP responses with unknown request IDs (bsc#1272169).
    - CVE-2026-59849: denial of service via automatic certificate authentication loop (bsc#1272170).
    - CVE-2026-59850: use-after-free via data callbacks on closed channels (bsc#1272171).

    Changes for libssh:

    - Update to 0.11.5:

     * Zero-initialize every ssh_string
     * Fix compatibility with C23 / gcc16
     * Fix multiple memory leaks, null checks, and error checks
     * Validate peer public key in DH key exchange
     * Avoid remote window overflow
     * Avoid off-by-one overflow during kbdint authentication
     * Avoid logging uninitialized sequence numbers
     * Avoid double conversion of SFTP version number
     * Send correct SFTP server version number
     * Avoid handling repeated SFTP INIT messages
     * Harmonize return values from SFTP server callbacks

    - Update %suse_version checks for SLES 16.x (jsc#PED-15815)

Tenable has extracted the preceding description block directly from the SUSE 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://bugzilla.suse.com/1272162");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272164");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272165");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272166");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272167");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272168");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272169");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272170");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.suse.com/1272171");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-15370");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59843");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59844");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59845");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59846");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59847");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59848");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59849");
  script_set_attribute(attribute:"see_also", value:"https://www.suse.com/security/cve/CVE-2026-59850");
  script_set_attribute(attribute:"solution", value:
"Update the affected libssh-config, libssh-devel and / or libssh4 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:C/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:N/UI:N/S:U/C:N/I:H/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-2026-59847");

  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:"2026/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libssh-config");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libssh-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libssh4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:16.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/SuSE/release');
if (isnull(os_release) || os_release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, 'openSUSE');
var _os_ver = pregmatch(pattern: "^SUSE([\d.]+)", string:os_release);
if (isnull(_os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'openSUSE');
_os_ver = _os_ver[1];
if (os_release !~ "^(SUSE16\.0)$") audit(AUDIT_OS_RELEASE_NOT, 'openSUSE', '16.0', os_release);
if (!get_kb_item("Host/SuSE/rpm-list")) 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, 'openSUSE ' + _os_ver, cpu);

var pkgs = [
    {'reference':'libssh-config-0.11.5-160000.1.1', 'release':'SUSE16.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libssh-devel-0.11.5-160000.1.1', 'release':'SUSE16.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libssh4-0.11.5-160000.1.1', 'release':'SUSE16.0', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var _cpu = NULL;
  var rpm_spec_vers_cmp = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (reference && _release) {
    if (rpm_check(release:_release, cpu:_cpu, reference:reference, rpm_spec_vers_cmp:rpm_spec_vers_cmp)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libssh-config / libssh-devel / libssh4');
}