TencentOS Server 4: nodejs20 (TSSA-2026:0757)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Tencent Linux Security Advisory TSSA-2026:0757.
##

include('compat.inc');

if (description)
{
  script_id(330786);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/30");

  script_cve_id(
    "CVE-2025-55130",
    "CVE-2025-55131",
    "CVE-2025-55132",
    "CVE-2025-59465",
    "CVE-2025-59466",
    "CVE-2026-21637"
  );

  script_name(english:"TencentOS Server 4: nodejs20 (TSSA-2026:0757)");

  script_set_attribute(attribute:"synopsis", value:
"The remote TencentOS Server 4 host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is,
therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0757 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2025-55130:
    A flaw in Node.jss Permissions model allows attackers to bypass `--allow-fs-read` and `--allow-fs-
    write` restrictions using crafted relative symlink paths. By chaining directories and symlinks, a script
    granted access only to the current directory can escape the allowed path and read sensitive files. This
    breaks the expected isolation guarantees and enables arbitrary file read/write, leading to potential
    system compromise.
    This vulnerability affects users of the permission model on Node.js v20,  v22,  v24, and v25.

    CVE-2025-55132:
    A flaw in Node.js's permission model allows a file's access and modification timestamps to be changed via
    `futimes()` even when the process has only read permissions. Unlike `utimes()`, `futimes()` does not apply
    the expected write-permission checks, which means file metadata can be modified in read-only directories.
    This behavior could be used to alter timestamps in ways that obscure activity, reducing the reliability of
    logs. This vulnerability affects users of the permission model on Node.js v20,  v22,  v24, and v25.

    CVE-2026-21637:
    A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server
    when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks
    bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process
    termination or silent file descriptor leaks that eventually lead to denial of service. Because these
    callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly
    trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js
    versions where these callbacks throw without being safely wrapped.

    CVE-2025-55131:
    A flaw in Node.js's buffer allocation logic can expose uninitialized memory when allocations are
    interrupted, when using the `vm` module with the timeout option. Under specific timing conditions, buffers
    allocated with `Buffer.alloc` and other `TypedArray` instances like `Uint8Array` may contain leftover data
    from previous operations, allowing in-process secrets like tokens or passwords to leak or causing data
    corruption. While exploitation typically requires precise timing or in-process code execution, it can
    become remotely exploitable when untrusted input influences workload and timeouts, leading to potential
    confidentiality and integrity impact.

    CVE-2025-59466:
    We have identified a bug in Node.js error handling where Maximum call stack size exceeded errors become
    uncatchable when `async_hooks.createHook()` is enabled. Instead of reaching
    `process.on('uncaughtException')`, the process terminates, making the crash unrecoverable. Applications
    that rely on `AsyncLocalStorage` (v22, v20) or `async_hooks.createHook()` (v24, v22, v20) become
    vulnerable to denial-of-service crashes triggered by deep recursion under specific conditions.

    CVE-2025-59465:
    A malformed `HTTP/2 HEADERS` frame with oversized, invalid `HPACK` data can cause Node.js to crash by
    triggering an unhandled `TLSSocket` error `ECONNRESET`. Instead of safely closing the connection, the
    process crashes, enabling a remote denial of service. This primarily affects applications that do not
    attach explicit error handlers to secure sockets, for example:
    ```
    server.on('secureConnection', socket => {
    socket.on('error', err => {
      console.log(err)
    })
    })
    ```

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

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://mirrors.tencent.com/tlinux/errata/tssa-20260757.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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-2025-55130");

  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:"2026/01/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:tencent:tencentos_server:4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:tencent:tencentos_server:nodejs20");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tencent 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/etc/os-release", "Host/TencentOS/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_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'TencentOS' >!< os_product) audit(AUDIT_OS_NOT, 'TencentOS');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'TencentOS');
if (! preg(pattern:"^4([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'TencentOS 4.x', 'TencentOS ' + os_version);

if (!get_kb_item('Host/TencentOS/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$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'TencentOS', cpu);

var constraints = [
  {
    'release': '4',
    'pkgs': [
      {'reference':'nodejs20-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-debuginfo-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-debuginfo-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-debugsource-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-debugsource-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-devel-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-devel-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-docs-20.20.0-1.tl4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-full-i18n-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-full-i18n-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-libs-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-libs-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-libs-debuginfo-20.20.0-1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-libs-debuginfo-20.20.0-1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-npm-10.8.2-20.20.0.1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'nodejs20-npm-10.8.2-20.20.0.1.tl4', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'v8-11.3-devel-11.3.244.8-20.20.0.1.tl4', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'v8-11.3-devel-11.3.244.8-20.20.0.1.tl4', '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, 'nodejs20 / nodejs20-debuginfo / nodejs20-debugsource / etc');
}