AlmaLinux 9.2 [TuxCare] Security Update: openexr / openexr-devel / openexr-libs Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1775234419)

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

include('compat.inc');

if (description)
{
  script_id(361003);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id(
    "CVE-2025-12495",
    "CVE-2025-12839",
    "CVE-2025-12840",
    "CVE-2025-64181"
  );
  script_xref(name:"CLSA", value:"2026:1775234419");

  script_name(english:"AlmaLinux 9.2 [TuxCare] Security Update: openexr / openexr-devel / openexr-libs Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1775234419)");

  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-2026:1775234419 advisory.

  - Academy Software Foundation OpenEXR EXR File Parsing Heap-based Buffer Overflow Remote Code Execution
    Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected
    installations of Academy Software Foundation OpenEXR. User interaction is required to exploit this
    vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw
    exists within the parsing of EXR files. The issue results from the lack of proper validation of the length
    of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this
    vulnerability to execute code in the context of the current process. Was ZDI-CAN-27946. (CVE-2025-12495)

  - Academy Software Foundation OpenEXR EXR File Parsing Heap-based Buffer Overflow Remote Code Execution
    Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected
    installations of Academy Software Foundation OpenEXR. User interaction is required to exploit this
    vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw
    exists within the parsing of EXR files. The issue results from the lack of proper validation of the length
    of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this
    vulnerability to execute code in the context of the current process. Was ZDI-CAN-27947. (CVE-2025-12839)

  - Academy Software Foundation OpenEXR EXR File Parsing Heap-based Buffer Overflow Remote Code Execution
    Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected
    installations of Academy Software Foundation OpenEXR. User interaction is required to exploit this
    vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw
    exists within the parsing of EXR files. The issue results from the lack of proper validation of the length
    of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this
    vulnerability to execute code in the context of the current process. Was ZDI-CAN-27948. (CVE-2025-12840)

  - OpenEXR provides the specification and reference implementation of the EXR file format, an image storage
    format for the motion picture industry. In versions 3.3.0 through 3.3.5 and 3.4.0 through 3.4.2, while
    fuzzing `openexr_exrcheck_fuzzer`, Valgrind reports a conditional branch depending on uninitialized data
    inside `generic_unpack`. This indicates a use of uninitialized memory. The issue can result in undefined
    behavior and/or a potential crash/denial of service. Versions 3.3.6 and 3.4.3 fix the issue.
    (CVE-2025-64181)

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_1775234419.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?40a23e49");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1775234419");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory ALMALINUX9.2:CLSA-2026:1775234419.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:U/C:N/I:N/A:H");
  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:N/VI:N/VA:L/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-64181");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/11/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/03");
  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':'openexr-3.1.1-3.el9.tuxcare.els3', 'sp':'2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openexr-devel-3.1.1-3.el9.tuxcare.els3', 'sp':'2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openexr-devel-3.1.1-3.el9.tuxcare.els3', 'sp':'2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openexr-libs-3.1.1-3.el9.tuxcare.els3', 'sp':'2', 'cpu':'i686', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'openexr-libs-3.1.1-3.el9.tuxcare.els3', 'sp':'2', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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, 'openexr / openexr-devel / openexr-libs');
}