Debian dla-4491 : libglib2.0-0 - 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-4491. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(299773);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/23");

  script_cve_id(
    "CVE-2026-0988",
    "CVE-2026-1484",
    "CVE-2026-1485",
    "CVE-2026-1489"
  );

  script_name(english:"Debian dla-4491 : libglib2.0-0 - 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 packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4491 advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4491-1                [email protected]
    https://www.debian.org/lts/security/                   Andreas Henriksson
    February 23, 2026                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : glib2.0
    Version        : 2.66.8-1+deb11u8
    CVE ID         : CVE-2026-0988 CVE-2026-1484 CVE-2026-1485 CVE-2026-1489
    Debian Bug     : 1125752 1126549 1126550 1126551

    Multiple issues were found in GLib, a general-purpose, portable utility
    library, that could lead to denial of service, memory corruption or
    potentially arbitrary code execution if maliciously crafted data is
    processed.

    CVE-2026-0988

        Codean Labs found missing validation of offset and count parameters in the
        g_buffered_input_stream_peek() function can lead to an integer overflow
        during length calculation. When specially crafted values are provided, this
        overflow results in an incorrect size being passed to memcpy(), triggering
        a buffer overflow. This can cause application crashes, leading to a Denial
        of Service (DoS).

    CVE-2026-1484

        treeplus with additional thanks to Sovereign Tech Resilience program of the
        Sovereign Tech Agency found in the GLib Base64 encoding routine when
        processing very large input data. Due to incorrect use of integer types
        during length calculation, the library may miscalculate buffer boundaries.
        This can cause memory writes outside the allocated buffer. Applications
        that process untrusted or extremely large Base64 input using GLib may crash
        or behave unpredictably.

    CVE-2026-1485

        treeplus with additonal thanks to Sovereign Tech Resilience program of the
        Sovereign Tech Agency found a flaw in Glib's content type parsing logic.
        This buffer underflow vulnerability occurs because the length of a header
        line is stored in a signed integer, which can lead to integer wraparound
        for very large inputs. This results in pointer underflow and out-of-bounds
        memory access. Exploitation requires a local user to install or
        process a specially crafted treemagic file, which can lead to local
        denial of service or application instability.

    CVE-2026-1489

        treeplus with additional thanks to Sovereign Tech Resilience program of the
        Sovereign Tech Agency found a flaw n GLib. An integer overflow
        vulnerability in its Unicode case conversion implementation can lead to
        memory corruption. By processing specially crafted and extremely large
        Unicode strings, an attacker could trigger an undersized memory allocation,
        resulting in out-of-bounds writes. This could cause applications utilizing
        GLib for string conversion to crash or become unstable.

    For Debian 11 bullseye, these problems have been fixed in version
    2.66.8-1+deb11u8.

    We recommend that you upgrade your glib2.0 packages.

    For the detailed security status of glib2.0 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/glib2.0

    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 these issues 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/glib2.0");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-0988");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-1484");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-1485");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-1489");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/glib2.0");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libglib2.0-0 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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-2026-1489");

  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:"2026/01/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-dev-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libglib2.0-udeb");
  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': 'libglib2.0-0', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-bin', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-data', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-dev', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-dev-bin', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-doc', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-tests', 'reference': '2.66.8-1+deb11u8'},
    {'release': '11.0', 'prefix': 'libglib2.0-udeb', 'reference': '2.66.8-1+deb11u8'}
];

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, 'libglib2.0-0 / libglib2.0-bin / libglib2.0-data / libglib2.0-dev / etc');
}