Debian dla-4670 : php-phpseclib - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4670. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(325133);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/06");

  script_cve_id(
    "CVE-2023-52892",
    "CVE-2024-27355",
    "CVE-2026-32935",
    "CVE-2026-40194",
    "CVE-2026-44167",
    "CVE-2026-55599"
  );

  script_name(english:"Debian dla-4670 : php-phpseclib - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the
dla-4670 advisory.

    - -----------------------------------------------------------------------
    Debian LTS Advisory DLA-4670-1              [email protected]
    https://www.debian.org/lts/security/                      Utkarsh Gupta
    July 05, 2026                               https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : php-phpseclib
    Version        : 2.0.30-2+deb11u3
    CVE ID         : CVE-2023-52892 CVE-2026-32935 CVE-2026-40194
                     CVE-2026-44167 CVE-2026-55599
    Debian Bug     : 1131483

    Several vulnerabilities were discovered in phpseclib, a PHP secure
    communications library, which could result in hostname validation
    bypass, timing side-channel attacks, denial of service, and
    server-side request forgery (SSRF).

    CVE-2023-52892

        X509.php did not properly escape regular expression special
        characters in a certificate's subjectAltName, allowing a crafted
        certificate to bypass hostname validation in validateURL().

    CVE-2026-32935

        The block cipher unpadding routine in Crypt/Base.php used a
        short-circuiting comparison, creating a timing side channel that
        could aid padding-oracle-style attacks.

    CVE-2026-40194

        The SSH2 implementation compared incoming packet HMACs using a
        variable-time string comparison, creating a timing side channel
        on cryptographic material.

    CVE-2026-44167

        The ASN.1 decoder's 4096-byte Object Identifier limit (mitigating
        CVE-2024-27355) was still large enough to allow an OID
        amplification denial of service via crafted ASN.1 structures.

    CVE-2026-55599

        File_X509 could automatically fetch a URL from a certificate's
        Authority Information Access extension without validating the
        destination, allowing SSRF via a crafted certificate.

    For Debian 11 bullseye, these problems have been fixed in version
    2.0.30-2+deb11u3.

    We recommend that you upgrade your php-phpseclib packages.

    For the detailed security status of php-phpseclib please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/php-phpseclib

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

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

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://security-tracker.debian.org/tracker/source-package/php-phpseclib
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bb7f1a05");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-52892");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-27355");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-32935");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-40194");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44167");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55599");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/php-phpseclib");
  script_set_attribute(attribute:"solution", value:
"Upgrade the php-phpseclib packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:C/I:N/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:H/PR:N/UI:N/S:U/C:H/I:N/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:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/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-2026-32935");

  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:"2024/03/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:php-phpseclib");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian 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_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'php-phpseclib', 'reference': '2.0.30-2+deb11u3'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'php-phpseclib');
}