RHEL 8 : Red Hat Single Sign-On 7.6.13 security update on RHEL 8 (Important) (RHSA-2026:76129)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2026:76129. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(363126);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/06");

  script_cve_id(
    "CVE-2025-9784",
    "CVE-2025-12543",
    "CVE-2025-14813",
    "CVE-2026-0603",
    "CVE-2026-2092",
    "CVE-2026-2575",
    "CVE-2026-3505",
    "CVE-2026-4634",
    "CVE-2026-5588",
    "CVE-2026-7307",
    "CVE-2026-7507",
    "CVE-2026-15563",
    "CVE-2026-42578",
    "CVE-2026-42579",
    "CVE-2026-42581",
    "CVE-2026-42587",
    "CVE-2026-44249",
    "CVE-2026-44893",
    "CVE-2026-45416",
    "CVE-2026-45674",
    "CVE-2026-47691",
    "CVE-2026-48043",
    "CVE-2026-48059",
    "CVE-2026-50010",
    "CVE-2026-50193",
    "CVE-2026-54512",
    "CVE-2026-68494"
  );
  script_xref(name:"RHSA", value:"2026:76129");

  script_name(english:"RHEL 8 : Red Hat Single Sign-On 7.6.13 security update on RHEL 8 (Important) (RHSA-2026:76129)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for Red Hat Single Sign-On 7.6.13.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2026:76129 advisory.

    Red Hat Single Sign-On 7.6 is a standalone server, based on the Keycloak project, that provides
    authentication and standards-based single sign-on capabilities for web and mobile applications.

    This release of Red Hat Single Sign-On 7.6.13 on RHEL 8 serves as a replacement for Red Hat Single Sign-On
    7.6.12, and includes bug fixes and enhancements, which are documented in the Release Notes document linked
    to in the References.

    Security Fix(es):
    * undertow-core: Undertow MadeYouReset HTTP/2 DDoS Vulnerability (CVE-2025-9784)
    * Undertow HTTP Server Fails to Reject Malformed Host Headers Leading to Potential Cache Poisoning and
    SSRF (CVE-2025-12543)
    * Undertow HTTP Server Fails to Reject Malformed Host Headers Leading to Potential Cache Poisoning and
    SSRF (CVE-2025-12543)
    * Information disclosure and data deletion via second-order SQL injection (CVE-2026-0603)
    * GOSTCTR implementation unable to process more than 255 blocks correctly (CVE-2025-14813)
    * PKIX draft CompositeVerifier accepts empty signature sequence as valid (CVE-2026-5588)
    * unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion (CVE-2026-3505)
    * High integrity impact due to improper DNS domain name constraint enforcement (CVE-2026-42579)
    * HTTP Request Smuggling due to improper handling of conflicting HTTP/1.0 headers (CVE-2026-42581)
    * HTTP Header Injection via HttpProxyHandler Disabled Validation (CVE-2026-42578)
    * Denial of Service via unbounded memory allocation in HTTP content decompression (CVE-2026-42587)
    * Denial of Service via unbounded memory allocation in HTTP content decompression (CVE-2026-42587)
    * IPv6 subnet rule bypass due to incorrect masking operation (CVE-2026-44249)
    * Denial of Service via malformed HAProxy message (CVE-2026-44893)
    * Denial of Service due to resource leak (CVE-2026-48043)
    * Netty HAProxy PROXY protocol v2 codec: Denial of Service via memory leak from crafted PROXY protocol
    headers (CVE-2026-48059)
    * Netty has Insufficient Bailiwick Validation for NS Records (CVE-2026-47691)
    * Improper trust manager handling leads to hostname verification bypass (CVE-2026-50010)
    * Information disclosure and data manipulation due to improper CNAME record validation (CVE-2026-45674)
    * Denial of Service due to eager buffer allocation in TLS handshake (CVE-2026-45416)
    * Arbitrary code execution via PolymorphicTypeValidator bypass (CVE-2026-54512)
    * Denial of Service via deeply nested JSON processing (CVE-2026-50193)
    * Denial of Service via incomplete fix in async JSON parser (CVE-2026-68494)
    * Missing authentication on EAP's IIOP NameService leads to MITM or DoS (CVE-2026-15563)
    * Session fixation in OIDC login flow that can lead to account takeover (CVE-2026-7507)
    * Denial of Service via specially crafted SAML input (CVE-2026-7307)
    * Denial of Service due to excessive SAMLRequest decompression (CVE-2026-2575)
    * Denial of Service via excessive processing of OpenID Connect scope parameters (CVE-2026-4634)
    * Unauthorized access via improper validation of encrypted SAML assertions (CVE-2026-2092)

    For more details about the security issue(s), including the impact, a CVSS score, 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");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_76129.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?322e9848");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:76129");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL Red Hat Single Sign-On 7.6.13 package based on the guidance in RHSA-2026:76129.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:C/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/RE:M/U:Red");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-42581");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-47691");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2025-14813");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20, 89, 93, 290, 306, 327, 346, 347, 409, 444, 502, 770, 772, 805, 1050, 1286, 1287);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/09/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-sso7-keycloak");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rh-sso7-keycloak-server");
  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(operator: 'ge', os_version: os_version, rhel_version: '8')) audit(AUDIT_OS_NOT, 'Red Hat 8.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);

var constraints = [
  {
    'release': '8',
    'repo_relative_urls': [
      'content/dist/layered/rhel8/x86_64/rh-sso/7.6/debug',
      'content/dist/layered/rhel8/x86_64/rh-sso/7.6/os',
      'content/dist/layered/rhel8/x86_64/rh-sso/7.6/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'rh-sso7-keycloak-18.0.20-1.redhat_00001.1.el8sso', 'el_string':'el8sso', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'rh-sso'},
      {'reference':'rh-sso7-keycloak-server-18.0.20-1.redhat_00001.1.el8sso', 'el_string':'el8sso', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'rh-sso'}
    ]
  }
];

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, 'rh-sso7-keycloak / rh-sso7-keycloak-server');
}