AlmaLinux 9.6 [TuxCare] Security Update: openssl / openssl-devel / openssl-libs / openssl-perl Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1782386492)

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

include('compat.inc');

if (description)
{
  script_id(361255);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id(
    "CVE-2026-7383",
    "CVE-2026-9076",
    "CVE-2026-34180",
    "CVE-2026-34182",
    "CVE-2026-34183",
    "CVE-2026-42766",
    "CVE-2026-42767",
    "CVE-2026-42768",
    "CVE-2026-42769",
    "CVE-2026-42770",
    "CVE-2026-45445",
    "CVE-2026-45446",
    "CVE-2026-45447"
  );
  script_xref(name:"CLSA", value:"2026:1782386492");

  script_name(english:"AlmaLinux 9.6 [TuxCare] Security Update: openssl / openssl-devel / openssl-libs / openssl-perl Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1782386492)");

  script_set_attribute(attribute:"synopsis", value:
"The AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare
ALMALINUX9.6:CLSA-2026:1782386492 advisory.

  - Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content
    exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms.
    Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into
    the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1
    elements would instead be truncated. An integer truncation in OpenSSL's ASN.1 decoder causes the content
    length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the
    truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly
    causing OpenSSL to read either less than or beyond the end of the allocated buffer. Applications that pass
    attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected.
    OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before
    it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms
    and 64-bit Windows are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by
    this issue, as the affected code is outside the OpenSSL FIPS module boundary. (CVE-2026-34180)

  - Issue Summary: Cryptographic Message Services (CMS) processing fails to perform sufficient input
    validation on the cipher and tag length fields of AuthEnvelopedData containers, leading to various
    potential compromises. Impact Summary: Attackers making use of these vulnerabilities may achieve key-
    equivalent functionality for a given CMS recipient and/or bypass integrity validation for a given message.
    In one use case, an attacker may send a CMS message containing AuthEnvelopedData with the cipher specified
    as a non-AEAD cipher. OpenSSL erroneously allows this selection, and attempts to decrypt and validate the
    message. An on-path attacker who captures one legitimate AES-GCM AuthEnvelopedData addressed to the victim
    can re-emit it with the recipientInfos set left byte-for-byte intact, so the victim's private key still
    unwraps the genuine CEK (the content-encryption key), but with the inner OID rewritten to AES-256-OFB
    (Output Feedback Mode, an unauthenticated keystream mode) and with an attacker-chosen IV and ciphertext.
    The victim initializes AES-256-OFB under the real CEK, never consults the MAC field, and CMS_decrypt()
    returns success. If the application under attack responds to the attacker with any indicator showing
    success or failure of the decryption effort, it is possible for the attacker to use this as an oracle to
    obtain key equivalent functionality for the CEK used for the chosen recipient of the message. In another
    use case, an attacker can reduce the tag length of the chosen AEAD cipher for a given AuthEnvelopedData
    container to be a single byte long, allowing an attacker to brute force CMS decryption, producing an
    integrity bypass for applications that trust CMS_decrypt() to reject modified content. The FIPS modules
    are not affected by this issue. (CVE-2026-34182)

  - Issue summary: Remote peer may exhaust heap memory of the QUIC server or client by flooding it with
    packets containing PATH_CHALLENGE frames. Impact summary: A malicious remote peer can cause an unbounded
    memory allocation which can lead to an abnormal termination of the application acting as a QUIC client or
    server and a Denial of Service. A remote peer may exhaust heap memory by flooding the local QUIC stack
    with PATH_CHALLENGE frames. The local QUIC stack allocates a PATH_RESPONSE frame for every PATH_CHALLENGE
    it receives. The allocated PATH_RESPONSE frame gets freed only when the remote peer acknowledges reception
    of the PATH_RESPONSE frame which will not be done by a malicious peer. The FIPS modules in 4.0, 3.6, 3.5,
    3.4, and 3.0 are not affected by this issue. The QUIC stack is outside of OpenSSL FIPS module boundary.
    (CVE-2026-34183)

  - Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference
    during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a
    Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in
    the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based
    CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it
    was present. An attacker who supplies such a CMS message to an application performing password-based CMS
    decryption can trigger an application crash, leading to a Denial of Service. Applications that process
    password-encrypted CMS messages may be affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not
    affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary. (CVE-2026-42766)

  - Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL
    pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash
    of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-
    the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format)
    CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no
    parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs,
    causing a crash of the CMP client. Applications that process untrusted CMP/CRMF messages may be affected.
    The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is
    outside the OpenSSL FIPS module boundary. (CVE-2026-42767)

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/tuxcare9.6esu/advisories/2026/clsa-2026_1782386492.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9f5969d2");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1782386492");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.6:CLSA-2026:1782386492.");
  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: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-2026-45447");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-34182");

  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:"Critical");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/25");
  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:"^9.6([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'AlmaLinux 9.6', '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': '6',
    'pkgs': [
      {'reference':'openssl-3.2.2-7.el9_6.tuxcare.1.els7', 'sp':'6', 'cpu':'x86_64', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-devel-3.2.2-7.el9_6.tuxcare.1.els7', 'sp':'6', 'cpu':'i686', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-devel-3.2.2-7.el9_6.tuxcare.1.els7', 'sp':'6', 'cpu':'x86_64', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-libs-3.2.2-7.el9_6.tuxcare.1.els7', 'sp':'6', 'cpu':'i686', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-libs-3.2.2-7.el9_6.tuxcare.1.els7', 'sp':'6', 'cpu':'x86_64', 'el_string':'el9_6', 'rpm_spec_vers_cmp':TRUE, 'epoch':'1'},
      {'reference':'openssl-perl-3.2.2-7.el9_6.tuxcare.1.els7', 'sp':'6', 'cpu':'x86_64', 'el_string':'el9_6', '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');
}