AlmaLinux 9.2 [TuxCare] Security Update: openssl / openssl-devel / openssl-libs / openssl-perl Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1789781561)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(359942);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id("CVE-2026-63074", "CVE-2026-63076", "CVE-2026-75803");
  script_xref(name:"CLSA", value:"2026:1789781561");

  script_name(english:"AlmaLinux 9.2 [TuxCare] Security Update: openssl / openssl-devel / openssl-libs / openssl-perl Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1789781561)");

  script_set_attribute(attribute:"synopsis", value:
"The AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare
ALMALINUX9.2:CLSA-2026:1789781561 advisory.

  - Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificates
    (extraCerts) sent in a CMP message, but never expunges them (for instance if they are invalid). If a
    server reuses an OSSL_CMP_CTX frequently, this cache of extraCerts may grow unboundedly, and a malicious
    client may flood a CMP server with requests driving this growth. Impact summary: Users utilizing a CMP
    server that reuses a single OSSL_CMP_CTX for the lifetime of a server process may observe unbounded memory
    growth in the event a malicious client repeatedly sends requests containing unique extra certificates,
    which may lead to OOM conditions. CWE: CWE-770: Allocation of Resources Without Limits or Throttling
    Description: If a remote user sends CMP messages to a server with a list of extraCerts and the message is
    rejected, the extraCerts from the message remains in the server contexts untrusted certificate stack. This
    exposes servers with long lived ctx objects to Denial of Service attacks in which an attacker sends
    messages intending to be rejected with a large list of additional certificates repeatedly, forcing the
    server to store them indefinitely. The issue was fixed by removing the added extra certs if the message is
    rejected, using the same method as when the context is configured to not do caching at all. FIPS impact:
    no As the CMP code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.
    (CVE-2026-63074)

  - Issue summary: OpenSSL CMP password based protection verification only checks whether the protectionAlg
    parameter was not NULL and not its ASN.1 type, before treating it as a PBMParameter. A crafted message can
    contain a parameter of a different type, which is then dereferenced as an invalid pointer. Impact summary:
    A remote, unauthenticated attacker can crash an application acting as a CMP server that accepts PBM-
    protected messages, or a CMP client talking to a malicious or intercepted CMP server, resulting in a
    Denial of Service. CWE: CWE-476: NULL Pointer Dereference Description: When verifying the password-based
    MAC protection of a CMP message, OpenSSL library reads the protectionAlg algorithm parameter with
    X509_ALGOR_get0(), which returns both the parameter type and its value pointer. The value is then cast to
    an ASN1_STRING and treated as the expected PBMParameter after only checking that pointer is not NULL. The
    parameter type returned by X509_ALGOR_get0() was never consulted. This happens during protection
    verification, before any MAC is computed, so no knowledge of the PBM shared secret is required; the only
    precondition is that PBM verification is reachable. On the server side this is reached from
    OSSL_CMP_SRV_process_request() for any application that stands up a CMP server accepting PBM-protected
    messages, and on the client side from CMP response validation against a malicious or on-path (MITM)
    server. The reliable consequence is a denial of service; there is no memory disclosure, no controlled
    memory write, and no path to code execution. CMP is a specialized feature that an application must
    explicitly enable. FIPS impact: no As the CMP code lives outside the FIPS module boundary, no FIPS modules
    are affected by this CVE. (CVE-2026-63076)

  - Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty ciphertext can report success
    without verifying the supplied authentication tag when the operation is finalized by calling the
    EVP_Cipher() function. Impact summary: Applications calling EVP_Cipher() on an empty ciphertext and
    expecting the call to check the AEAD tag may accept forged messages. CWE: CWE-354 (Improper Validation of
    Integrity Check Value) Description: The EVP_Cipher() API call for AEAD ciphers behaves like a one shot
    encryption and decryption call. It also verifies the AEAD tag after the decryption operation. However for
    AES-OCB and ChaCha20-Poly1305 ciphers it skipped the AEAD tag verification when an empty ciphertext was
    passed to the function. The callers of this function might believe that a successful return indicates a
    valid AEAD tag for these ciphers, even when that has not truly been validated in this case. FIPS impact:
    no The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE as the affected algorithms
    are not FIPS approved and thus not implemented in the FIPS module. (CVE-2026-75803)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security.tuxcare.com/csaf/v2/els_os/almalinux9.2esu/advisories/2026/clsa-2026_1789781561.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?650a31da");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1789781561");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.2:CLSA-2026:1789781561.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/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:H/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-2026-75803");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alma Linux 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_info2.nasl");
  script_require_keys("Host/OS/extended-third-party", "Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (empty_or_null(third_party_support) || third_party_support != 'TuxCare') exit(0, 'TuxCare support not enabled.');

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) || 'AlmaLinux' >!< os_product) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
if (! preg(pattern:"^9.2([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'AlmaLinux 9.2', 'AlmaLinux ' + os_version);

if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);


var constraints = [
  {
    'release': '9',
    'sp': '2',
    'pkgs': [
      {'reference':'openssl-3.0.7-20.el9_2.tuxcare.1.els23', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-devel-3.0.7-20.el9_2.tuxcare.1.els23', 'sp':'2', 'cpu':'i686', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-devel-3.0.7-20.el9_2.tuxcare.1.els23', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-libs-3.0.7-20.el9_2.tuxcare.1.els23', 'sp':'2', 'cpu':'i686', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-libs-3.0.7-20.el9_2.tuxcare.1.els23', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-perl-3.0.7-20.el9_2.tuxcare.1.els23', 'sp':'2', 'cpu':'x86_64', 'el_string':'el9_2', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'}
    ]
  }
];

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 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;
  }
  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 &&
        ## (no known rpm to check OR known rpm_exists)
        (!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)
{
  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, 'openssl / openssl-devel / openssl-libs / openssl-perl');
}