Debian dla-4741 : unzip - 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-4741. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(335908);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/16");

  script_name(english:"Debian dla-4741 : unzip - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 / 12 host has a package installed that is affected by a vulnerability as referenced in the dla-4741
advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4741-1                [email protected]
    https://www.debian.org/lts/security/                       Andrej Shadura
    August 16, 2026                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : unzip
    Version        : 6.0-26+deb11u2 6.0-28+deb12u1
    CVE ID         : not yet available
    Debian Bug     : 1142904 1142905 1142906

    Akhil Koul discovered a vulnerability in the Info-ZIP unzip program,
    which could result in the execution of arbitrary code if a specially
    crafted file is processed.

    For Debian 11 bullseye, this problem has been fixed in version
    6.0-26+deb11u2.

    For Debian 12 bookworm, this problem has been fixed in version
    6.0-28+deb12u1.

    In addition, both uploads contain patches that fix two crashes in unzip
    caused by stack and heap out-of-bounds access.

    We recommend that you upgrade your unzip packages.

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

    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 this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/unzip");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/unzip");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/unzip");
  script_set_attribute(attribute:"solution", value:
"Upgrade the unzip packages.");
  script_set_attribute(attribute:"risk_factor", value:"High");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:unzip");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  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]+|^(12)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0 / 12.0', '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': 'unzip', 'reference': '6.0-26+deb11u2'},
    {'release': '12.0', 'prefix': 'unzip', 'reference': '6.0-28+deb12u1'}
];

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_HOLE,
    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, 'unzip');
}