RHEL 9 : openssh (RHSA-2026:47756)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:47756. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(330864);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/30");

  script_cve_id(
    "CVE-2026-55653",
    "CVE-2026-55654",
    "CVE-2026-55655",
    "CVE-2026-59996",
    "CVE-2026-60002"
  );
  script_xref(name:"RHSA", value:"2026:47756");

  script_name(english:"RHEL 9 : openssh (RHSA-2026:47756)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for openssh.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:47756 advisory.

    OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating
    systems. It includes the core files necessary for both the OpenSSH client and server.

    Security Fix(es):

    * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux
    OpenSSH client versions (CVE-2026-55655)

    * openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS
    known-group validation leads to client-side denial of service (CVE-2026-55653)

    * openssh: Heap out-of-bounds read in Red Hat Enterprise Linux versions of OpenSSH GSSAPI indicator
    cleanup due to missing NULL sentinel termination (CVE-2026-55654)

    * openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side
    (CVE-2026-60002)

    * openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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://access.redhat.com/security/updates/classification/#important");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2462250");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2462351");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2462493");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2497936");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2497944");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_47756.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4a2be230");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:47756");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL openssh package based on the guidance in RHSA-2026:47756.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:N/S:U/C:H/I:H/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-60002");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(22, 125, 415, 825, 923);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_eus:9.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openssh-askpass");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openssh-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openssh-keycat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:openssh-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:pam_ssh_agent_auth");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat 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", "redhat_repos.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Red Hat' >!< os_product) audit(AUDIT_OS_NOT, 'Red Hat');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
if (!rhel_check_release_list(operator: 'ge', os_version: os_version, rhel_versions: ['9','9.8'])) audit(AUDIT_OS_NOT, 'Red Hat 9.x', 'Red Hat ' + os_version);

if (!get_kb_item('Host/RedHat/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 && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

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      'content/dist/rhel9/9.5/s390x/baseos/os',
      'content/dist/rhel9/9.5/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.5/x86_64/baseos/debug',
      'content/dist/rhel9/9.5/x86_64/baseos/os',
      'content/dist/rhel9/9.5/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9.6/aarch64/baseos/debug',
      'content/dist/rhel9/9.6/aarch64/baseos/os',
      'content/dist/rhel9/9.6/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.6/ppc64le/baseos/debug',
      'content/dist/rhel9/9.6/ppc64le/baseos/os',
      'content/dist/rhel9/9.6/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.6/s390x/baseos/debug',
      'content/dist/rhel9/9.6/s390x/baseos/os',
      'content/dist/rhel9/9.6/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.6/x86_64/baseos/debug',
      'content/dist/rhel9/9.6/x86_64/baseos/os',
      'content/dist/rhel9/9.6/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/aarch64/baseos/debug',
      'content/dist/rhel9/9.7/aarch64/baseos/os',
      'content/dist/rhel9/9.7/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/ppc64le/baseos/debug',
      'content/dist/rhel9/9.7/ppc64le/baseos/os',
      'content/dist/rhel9/9.7/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/s390x/baseos/debug',
      'content/dist/rhel9/9.7/s390x/baseos/os',
      'content/dist/rhel9/9.7/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.7/x86_64/baseos/debug',
      'content/dist/rhel9/9.7/x86_64/baseos/os',
      'content/dist/rhel9/9.7/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/aarch64/baseos/debug',
      'content/dist/rhel9/9.8/aarch64/baseos/os',
      'content/dist/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/ppc64le/baseos/debug',
      'content/dist/rhel9/9.8/ppc64le/baseos/os',
      'content/dist/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/s390x/baseos/debug',
      'content/dist/rhel9/9.8/s390x/baseos/os',
      'content/dist/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.8/x86_64/baseos/debug',
      'content/dist/rhel9/9.8/x86_64/baseos/os',
      'content/dist/rhel9/9.8/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/aarch64/baseos/debug',
      'content/dist/rhel9/9.9/aarch64/baseos/os',
      'content/dist/rhel9/9.9/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/ppc64le/baseos/debug',
      'content/dist/rhel9/9.9/ppc64le/baseos/os',
      'content/dist/rhel9/9.9/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/s390x/baseos/debug',
      'content/dist/rhel9/9.9/s390x/baseos/os',
      'content/dist/rhel9/9.9/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9.9/x86_64/baseos/debug',
      'content/dist/rhel9/9.9/x86_64/baseos/os',
      'content/dist/rhel9/9.9/x86_64/baseos/source/SRPMS',
      'content/dist/rhel9/9/aarch64/baseos/debug',
      'content/dist/rhel9/9/aarch64/baseos/os',
      'content/dist/rhel9/9/aarch64/baseos/source/SRPMS',
      'content/dist/rhel9/9/ppc64le/baseos/debug',
      'content/dist/rhel9/9/ppc64le/baseos/os',
      'content/dist/rhel9/9/ppc64le/baseos/source/SRPMS',
      'content/dist/rhel9/9/s390x/baseos/debug',
      'content/dist/rhel9/9/s390x/baseos/os',
      'content/dist/rhel9/9/s390x/baseos/source/SRPMS',
      'content/dist/rhel9/9/x86_64/baseos/debug',
      'content/dist/rhel9/9/x86_64/baseos/os',
      'content/dist/rhel9/9/x86_64/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/aarch64/baseos/debug',
      'content/public/ubi/dist/ubi9/9/aarch64/baseos/os',
      'content/public/ubi/dist/ubi9/9/aarch64/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/ppc64le/baseos/debug',
      'content/public/ubi/dist/ubi9/9/ppc64le/baseos/os',
      'content/public/ubi/dist/ubi9/9/ppc64le/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/s390x/baseos/debug',
      'content/public/ubi/dist/ubi9/9/s390x/baseos/os',
      'content/public/ubi/dist/ubi9/9/s390x/baseos/source/SRPMS',
      'content/public/ubi/dist/ubi9/9/x86_64/baseos/debug',
      'content/public/ubi/dist/ubi9/9/x86_64/baseos/os',
      'content/public/ubi/dist/ubi9/9/x86_64/baseos/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'openssh-9.9p1-9.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'openssh-clients-9.9p1-9.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'openssh-keycat-9.9p1-9.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'openssh-server-9.9p1-9.el9_8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE}
    ]
  },
  {
    'release': '9',
    'sp': '8',
    'repo_relative_urls': [
      'content/e4s/rhel9/9.8/aarch64/appstream/debug',
      'content/e4s/rhel9/9.8/aarch64/appstream/os',
      'content/e4s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e4s/rhel9/9.8/ppc64le/appstream/os',
      'content/e4s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/s390x/appstream/debug',
      'content/e4s/rhel9/9.8/s390x/appstream/os',
      'content/e4s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e4s/rhel9/9.8/x86_64/appstream/debug',
      'content/e4s/rhel9/9.8/x86_64/appstream/os',
      'content/e4s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/aarch64/appstream/debug',
      'content/e6s/rhel9/9.8/aarch64/appstream/os',
      'content/e6s/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/ppc64le/appstream/debug',
      'content/e6s/rhel9/9.8/ppc64le/appstream/os',
      'content/e6s/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/s390x/appstream/debug',
      'content/e6s/rhel9/9.8/s390x/appstream/os',
      'content/e6s/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/e6s/rhel9/9.8/x86_64/appstream/debug',
      'content/e6s/rhel9/9.8/x86_64/appstream/os',
      'content/e6s/rhel9/9.8/x86_64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/aarch64/appstream/debug',
      'content/eus/rhel9/9.8/aarch64/appstream/os',
      'content/eus/rhel9/9.8/aarch64/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/ppc64le/appstream/debug',
      'content/eus/rhel9/9.8/ppc64le/appstream/os',
      'content/eus/rhel9/9.8/ppc64le/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/s390x/appstream/debug',
      'content/eus/rhel9/9.8/s390x/appstream/os',
      'content/eus/rhel9/9.8/s390x/appstream/source/SRPMS',
      'content/eus/rhel9/9.8/x86_64/appstream/debug',
      'content/eus/rhel9/9.8/x86_64/appstream/os',
      'content/eus/rhel9/9.8/x86_64/appstream/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'openssh-askpass-9.9p1-9.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'pam_ssh_agent_auth-0.10.4-7.9.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '9',
    'sp': '8',
    'repo_relative_urls': [
      'content/e4s/rhel9/9.8/aarch64/baseos/debug',
      'content/e4s/rhel9/9.8/aarch64/baseos/os',
      'content/e4s/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/e4s/rhel9/9.8/ppc64le/baseos/debug',
      'content/e4s/rhel9/9.8/ppc64le/baseos/os',
      'content/e4s/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/e4s/rhel9/9.8/s390x/baseos/debug',
      'content/e4s/rhel9/9.8/s390x/baseos/os',
      'content/e4s/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/e4s/rhel9/9.8/x86_64/baseos/debug',
      'content/e4s/rhel9/9.8/x86_64/baseos/os',
      'content/e4s/rhel9/9.8/x86_64/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/aarch64/baseos/debug',
      'content/e6s/rhel9/9.8/aarch64/baseos/os',
      'content/e6s/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/ppc64le/baseos/debug',
      'content/e6s/rhel9/9.8/ppc64le/baseos/os',
      'content/e6s/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/s390x/baseos/debug',
      'content/e6s/rhel9/9.8/s390x/baseos/os',
      'content/e6s/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/e6s/rhel9/9.8/x86_64/baseos/debug',
      'content/e6s/rhel9/9.8/x86_64/baseos/os',
      'content/e6s/rhel9/9.8/x86_64/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/aarch64/baseos/debug',
      'content/eus/rhel9/9.8/aarch64/baseos/os',
      'content/eus/rhel9/9.8/aarch64/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/ppc64le/baseos/debug',
      'content/eus/rhel9/9.8/ppc64le/baseos/os',
      'content/eus/rhel9/9.8/ppc64le/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/s390x/baseos/debug',
      'content/eus/rhel9/9.8/s390x/baseos/os',
      'content/eus/rhel9/9.8/s390x/baseos/source/SRPMS',
      'content/eus/rhel9/9.8/x86_64/baseos/debug',
      'content/eus/rhel9/9.8/x86_64/baseos/os',
      'content/eus/rhel9/9.8/x86_64/baseos/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'openssh-9.9p1-9.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'openssh-clients-9.9p1-9.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'openssh-keycat-9.9p1-9.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
      {'reference':'openssh-server-9.9p1-9.el9_8', 'sp':'8', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var repo_relative_urls;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }

  if (!empty_or_null(constraint['repo_relative_urls'])) repo_relative_urls = constraint['repo_relative_urls'];

  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(rpm:exists_check))) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'openssh / openssh-askpass / openssh-clients / openssh-keycat / etc');
}