CentOS Linux 6 [TuxCare] Security Update: php / php-bcmath / php-cli / php-common / php-dba / php-devel / etc Multiple Vulnerabilities (CENTOS6:CLSA-2026:1779120876)

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

include('compat.inc');

if (description)
{
  script_id(352354);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/30");

  script_cve_id("CVE-2026-6722", "CVE-2026-7261");
  script_xref(name:"CLSA", value:"2026:1779120876");

  script_name(english:"CentOS Linux 6 [TuxCare] Security Update: php / php-bcmath / php-cli / php-common / php-dba / php-devel / etc Multiple Vulnerabilities (CENTOS6:CLSA-2026:1779120876)");

  script_set_attribute(attribute:"synopsis", value:
"The CentOS Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The CentOS Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the
TuxCare CENTOS6:CLSA-2026:1779120876 advisory.

  - In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the
    SOAP extension's object deduplication mechanism stores pointers to PHP objects in a global map without
    incrementing their reference counts. When an apache:Map node contains duplicate keys, processing the
    second entry overwrites the first in the temporary result map, freeing the original PHP object while its
    stale pointer remains in the map. A subsequent href reference to the freed node can copy the dangling
    pointer into the result. As PHP string allocations can reclaim the freed memory region, an attacker with
    control over the SOAP request body can exploit this use-after-free to achieve remote code execution.
    (CVE-2026-6722)

  - In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6,
    when SoapServer is configured with SOAP_PERSISTENCE_SESSION, the handler object is persisted across
    requests via session storage. However, in the case SOAP requests results in an error, the persistance is
    handled incorrectly, resulting in freeing the object while keeping a pointer to it, which may lead to use-
    after-free. This may lead to memory corruption, information disclosure, or process crashes, with
    confidentiality, integrity, and availability impact on the vulnerable system. (CVE-2026-7261)

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/centos6els/advisories/2026/clsa-2026_1779120876.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?332b6f4a");
  script_set_attribute(attribute:"see_also", value:"https://cve.tuxcare.com/els/releases/CLSA-2026:1779120876");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages based on the guidance in TuxCare advisory CENTOS6:CLSA-2026:1779120876.");
  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:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H");
  script_set_attribute(attribute:"cvss4_supplemental", value:"CVSS:4.0/AU:Y/RE:M/U:Red");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-7261");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-6722");

  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:"2026/05/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/30");

  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:"CentOS 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/CentOS/release", "Host/CentOS/rpm-list");

  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) || 'CentOS Linux' >!< os_product) audit(AUDIT_OS_NOT, 'CentOS Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS Linux');
if (! preg(pattern:"^6([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'CentOS Linux 6', 'CentOS Linux ' + os_version);

if (!get_kb_item('Host/CentOS/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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS Linux', cpu);


var constraints = [
  {
    'release': '6',
    'pkgs': [
      {'reference':'php-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-bcmath-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-cli-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-common-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-dba-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-devel-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-embedded-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-enchant-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-fpm-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-gd-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-imap-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-intl-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-ldap-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-mbstring-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-mysql-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-odbc-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-pdo-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-pgsql-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-process-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-pspell-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-recode-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-snmp-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-soap-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-tidy-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-xml-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-xmlrpc-5.3.3-55.el6.tuxcare.els19', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'php-zts-5.3.3-55.el6.tuxcare.els19', '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, 'php / php-bcmath / php-cli / php-common / php-dba / php-devel / etc');
}