NewStart CGSL MAIN 7.02 : libxml2 Multiple Vulnerabilities (NS-SA-2026-0087)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2026-0087. The text
# itself is copyright (C) ZTE, Inc.
##

include('compat.inc');

if (description)
{
  script_id(343576);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/08");

  script_cve_id(
    "CVE-2025-6021",
    "CVE-2025-7425",
    "CVE-2025-49794",
    "CVE-2025-49796",
    "CVE-2026-0990"
  );
  script_xref(name:"IAVA", value:"2025-A-0707-S");
  script_xref(name:"IAVA", value:"2025-A-0840-S");

  script_name(english:"NewStart CGSL MAIN 7.02 : libxml2 Multiple Vulnerabilities (NS-SA-2026-0087)");

  script_set_attribute(attribute:"synopsis", value:
"The remote NewStart CGSL host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version MAIN 7.02, has libxml2 packages installed that are affected by multiple
vulnerabilities:

  - A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can
    trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that
    can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to
    sensitive data being corrupted in memory. (CVE-2025-49796)

  - A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under
    certain circumstances when the XML schematron has the <sch:name path=.../> schema elements. This flaw
    allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the
    program's crash using libxml or other possible undefined behaviors. (CVE-2025-49794)

  - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations
    can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of
    service when processing crafted input. (CVE-2025-6021)

  - A flaw was found in libxslt where the attribute type, atype, flags are modified in a way that corrupts
    internal memory management. When XSLT functions, such as the key() process, result in tree fragments, this
    corruption prevents the proper cleanup of ID attributes. As a result, the system may access freed memory,
    causing crashes or enabling attackers to trigger heap corruption. (CVE-2025-7425)

  - A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in
    the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references
    itself. A remote attacker could exploit this configuration-dependent issue by providing a specially
    crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a
    segmentation fault, causing a Denial of Service (DoS) by crashing affected applications. (CVE-2026-0990)

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://security.gd-linux.com/notice/NS-SA-2026-0087");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2025-49794");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2025-49796");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2025-6021");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2025-7425");
  script_set_attribute(attribute:"see_also", value:"https://security.gd-linux.com/info/CVE-2026-0990");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL libxml2 packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:U/C:N/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-49796");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:libxml2-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:libxml2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:libxml2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:libxml2-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:zte:cgsl_main:python3-libxml2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:zte:cgsl_main:7");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"NewStart CGSL 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/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  exit(0);
}

include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var os_release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(os_release) || os_release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (os_release !~ "CGSL\sMAIN\s7\.02")
  audit(AUDIT_OS_NOT, 'NewStart CGSL MAIN 7.02');

if (!get_kb_item('Host/ZTE-CGSL/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'NewStart Carrier Grade Server Linux', cpu);

var flag = 0;

var pkgs = {
  'CGSL MAIN 7.02': [
    'libxml2-2.11.5-2.zncgsl7.14',
    'libxml2-core-2.11.5-2.zncgsl7.14',
    'libxml2-devel-2.11.5-2.zncgsl7.14',
    'libxml2-doc-2.11.5-2.zncgsl7.14',
    'libxml2-static-2.11.5-2.zncgsl7.14',
    'python3-libxml2-2.11.5-2.zncgsl7.14'
  ]
};
var pkg_list = pkgs[os_release];
var pkg;
foreach (pkg in pkg_list)
  if (rpm_check(reference:pkg, release:'ZTE ' + os_release, rpm_spec_vers_cmp:TRUE)) 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, 'libxml2');
}