Debian dsa-6216 : opam - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-6216. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(307613);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/20");

  script_cve_id("CVE-2026-41082");

  script_name(english:"Debian dsa-6216 : opam - 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 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6216
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6216-1                   [email protected]
    https://www.debian.org/security/                       Moritz Muehlenhoff
    April 17, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : opam
    CVE ID         : CVE-2026-41082

    Andrew Nesbitt discovered that .install file directives were
    insufficiently restricted in OPAM, a package manager for OCaml. This
    could result in directory traversal out of the package area.

    For the oldstable distribution (bookworm), this problem has been fixed
    in version 2.1.2-1+deb12u1.

    For the stable distribution (trixie), this problem has been fixed in
    version 2.3.0-1+deb13u1.

    We recommend that you upgrade your opam packages.

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

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

    Mailing list: [email protected]

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/opam");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-41082");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/opam");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/opam");
  script_set_attribute(attribute:"solution", value:
"Upgrade the opam packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:C/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-41082");

  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:"2026/04/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:opam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:opam-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:opam-installer");
  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:"^(12)\.[0-9]+|^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 12.0 / 13.0', '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': '12.0', 'prefix': 'opam', 'reference': '2.1.2-1+deb12u1'},
    {'release': '12.0', 'prefix': 'opam-doc', 'reference': '2.1.2-1+deb12u1'},
    {'release': '12.0', 'prefix': 'opam-installer', 'reference': '2.1.2-1+deb12u1'},
    {'release': '13.0', 'prefix': 'opam', 'reference': '2.3.0-1+deb13u1'},
    {'release': '13.0', 'prefix': 'opam-doc', 'reference': '2.3.0-1+deb13u1'},
    {'release': '13.0', 'prefix': 'opam-installer', 'reference': '2.3.0-1+deb13u1'}
];

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, 'opam / opam-doc / opam-installer');
}