Alibaba Cloud Linux 3 : 0268: glib2 (ALINUX3-SA-2026:0268)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# Alibaba Cloud Linux Security Advisory ALINUX3-SA-2026:0268.
##

include('compat.inc');

if (description)
{
  script_id(342092);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/01");

  script_cve_id(
    "CVE-2026-15588",
    "CVE-2026-58010",
    "CVE-2026-58011",
    "CVE-2026-58012",
    "CVE-2026-58013",
    "CVE-2026-58014",
    "CVE-2026-58015"
  );

  script_name(english:"Alibaba Cloud Linux 3 : 0268: glib2 (ALINUX3-SA-2026:0268)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Alibaba Cloud Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced
in the ALINUX3-SA-2026:0268 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2026-15588:
    A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The
    `gdbusauth` authentication mechanism fails to enforce proper length limitations on data lines read from a
    client. An unauthenticated local or remote attacker can exploit this lack of input validation by sending
    excessively long streams of data, causing the application to consume massive amounts of system memory and
    CPU, potentially leading to a crash or system hang.

    CVE-2026-58010:
    A flaw was found in GLib. An off-by-one error can occur in the gvs_tuple_is_normal function in the
    glib/gvariant-serialiser.c file when doing an alignment padding check because the bounds check uses >
    instead of >=, causing an out-of-bounds read of only 1 byte. This issue can cause a minor information
    disclosure of 1 byte and a denial of service when the out-of-bounds read crosses a page boundary.

    CVE-2026-58011:
    A flaw was found in GLib. An out-of-bounds read of only 2 bytes can occur in the g_date_time_get_ymd
    function in the glib/gdatetime.c file when an invalid GDateTime object produced by the
    g_date_time_add_full function is processed. This flaw can corrupt the date output and potentially cause
    logic errors that may lead to a denial of service.

    CVE-2026-58012:
    A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the
    `G_REGEX_RAW` compile flag and case-change replacement escapes because the string_append function
    processes matched substrings using UTF-8 functions that assume valid UTF-8 input, even when the string is
    treated as raw bytes. This vulnerability can cause a minor information disclosure of 1-5 bytes and a
    denial of service when the buffer over-read crosses a page boundary.

    CVE-2026-58013:
    A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in the
    giochannel.c file when a custom line terminator with a length greater than one is set, causing memcmp to
    read past the GString buffer. This vulnerability can cause a minor information disclosure of 7 bytes or a
    denial of service when the buffer over-read crosses a page boundary.

    CVE-2026-58014:
    A flaw was found in GLib. An off-by-one error can occur in the g_key_file_get_locale_string_list function
    in the gkeyfile.c file when loading a key file with an empty value. This flaw can cause an out-of-bounds
    access of 1 byte or a denial of service when the out-of-bounds access crosses a page boundary.

    CVE-2026-58015:
    A flaw was found in GLib. The D-Bus client-side implementation of the DBUS_COOKIE_SHA1 SASL authentication
    mechanism does not validate the cookie_context parameter received from the server. A malicious D-Bus
    server can supply a cookie_context containing path traversal sequences, causing the client to read an
    arbitrary file and exfiltrate sensitive data by verifying guessed file contents against a generated hash.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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:"http://mirrors.aliyun.com/alinux/3/cve/alinux3-sa-20260268.xml");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:C");
  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:L/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-58014");

  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:"2026/06/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:glib2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:glib2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:glib2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:glib2-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:glib2-tests");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alibabacloud:alibaba_cloud_linux_3");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alibaba Cloud Linux 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/Alibaba/release", "Host/Alibaba/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'Alibaba Cloud Linux' >!< os_product) audit(AUDIT_OS_NOT, 'Alibaba Cloud Linux');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'Alibaba Cloud Linux');
if (! preg(pattern:"^3([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'Alibaba Cloud Linux 3.x', 'Alibaba Cloud Linux ' + os_version);

if (!get_kb_item('Host/Alibaba/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Alibaba Cloud Linux', cpu);

var constraints = [
  {
    'release': '3',
    'pkgs': [
      {'reference':'glib2-2.68.4-19.0.1.al8.9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-2.68.4-19.0.1.al8.9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-devel-2.68.4-19.0.1.al8.9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-devel-2.68.4-19.0.1.al8.9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-doc-2.68.4-19.0.1.al8.9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-static-2.68.4-19.0.1.al8.9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-static-2.68.4-19.0.1.al8.9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-tests-2.68.4-19.0.1.al8.9', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'},
      {'reference':'glib2-tests-2.68.4-19.0.1.al8.9', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE, 'epoch':'0'}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'glib2 / glib2-devel / glib2-doc / glib2-static / glib2-tests');
}