Debian dla-4707 : gsasl - 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-4707. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(331322);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/31");

  script_cve_id("CVE-2026-56968");

  script_name(english:"Debian dla-4707 : gsasl - 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 packages installed that are affected by a vulnerability as referenced in the dla-4707
advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4707-1                [email protected]
    https://www.debian.org/lts/security/          Carlos Henrique Lima Melara
    July 30, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : gsasl
    Version        : 1.10.0-4+deb11u3 2.2.0-1+deb12u2
    CVE ID         : CVE-2026-56968

    It was discovered that missing input sanitising in the NTLM client of the
    GNU SASL library could result in memory disclosure.

    For Debian 11 bullseye, this problem has been fixed in version
    1.10.0-4+deb11u3.

    For Debian 12 bookworm, this problem has been fixed in version
    2.2.0-1+deb12u2.

    We recommend that you upgrade your gsasl packages.

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

    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
    Attachment:
    signature.asc
    Description: PGP signature

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/gsasl");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-56968");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bookworm/gsasl");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/gsasl");
  script_set_attribute(attribute:"solution", value:
"Upgrade the gsasl packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/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:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-56968");

  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:"2026/06/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gsasl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gsasl-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gsasl-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgsasl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgsasl18");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgsasl7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgsasl7-dev");
  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': 'gsasl', 'reference': '1.10.0-4+deb11u3'},
    {'release': '11.0', 'prefix': 'gsasl-common', 'reference': '1.10.0-4+deb11u3'},
    {'release': '11.0', 'prefix': 'gsasl-doc', 'reference': '1.10.0-4+deb11u3'},
    {'release': '11.0', 'prefix': 'libgsasl-dev', 'reference': '1.10.0-4+deb11u3'},
    {'release': '11.0', 'prefix': 'libgsasl7', 'reference': '1.10.0-4+deb11u3'},
    {'release': '11.0', 'prefix': 'libgsasl7-dev', 'reference': '1.10.0-4+deb11u3'},
    {'release': '12.0', 'prefix': 'gsasl', 'reference': '2.2.0-1+deb12u2'},
    {'release': '12.0', 'prefix': 'gsasl-common', 'reference': '2.2.0-1+deb12u2'},
    {'release': '12.0', 'prefix': 'gsasl-doc', 'reference': '2.2.0-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libgsasl-dev', 'reference': '2.2.0-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libgsasl18', 'reference': '2.2.0-1+deb12u2'},
    {'release': '12.0', 'prefix': 'libgsasl7-dev', 'reference': '2.2.0-1+deb12u2'}
];

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, 'gsasl / gsasl-common / gsasl-doc / libgsasl-dev / libgsasl18 / etc');
}