EulerOS 2.0 SP12 : xorg-x11-server (EulerOS-SA-2026-2637)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(326144);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/10");

  script_cve_id(
    "CVE-2026-33999",
    "CVE-2026-34000",
    "CVE-2026-34001",
    "CVE-2026-34002",
    "CVE-2026-34003"
  );

  script_name(english:"EulerOS 2.0 SP12 : xorg-x11-server (EulerOS-SA-2026-2637)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the xorg-x11-server packages installed, the EulerOS installation on the remote host is
affected by the following vulnerabilities :

    A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry
    processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an
    attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server,
    either locally or remotely, can exploit this without user interaction. This could lead to the disclosure
    of memory contents or cause a denial of service by crashing the server.(CVE-2026-34000)

    A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a
    specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This
    could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial
    of Service (DoS). In certain configurations, higher impact outcomes may be possible.(CVE-2026-34003)

    A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X
    Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by
    sending a malformed request, which causes the server to read beyond its intended memory boundaries. This
    can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of
    service.(CVE-2026-34002)

    A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB
    compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer
    read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other
    severe impacts.(CVE-2026-33999)

    A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence
    triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the
    X11 server can exploit this without user interaction, leading to a server crash and potentially enabling
    memory corruption. This could result in a denial of service or further compromise of the
    system.(CVE-2026-34001)

Tenable has extracted the preceding description block directly from the EulerOS xorg-x11-server security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2026-2637
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9adbaa09");
  script_set_attribute(attribute:"solution", value:
"Update the affected xorg-x11-server packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C");
  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:N/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-34002");

  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:"2026/04/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:xorg-x11-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:xorg-x11-server-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:xorg-x11-server-help");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei 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/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var _release = get_kb_item("Host/EulerOS/release");
if (isnull(_release) || _release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (_release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP12");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(12)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP12");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP12", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

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 && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

var flag = 0;

var pkgs = [
  "xorg-x11-server-1.20.11-13.h16.eulerosv2r12",
  "xorg-x11-server-common-1.20.11-13.h16.eulerosv2r12",
  "xorg-x11-server-help-1.20.11-13.h16.eulerosv2r12"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"12", reference:pkg)) 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, "xorg-x11-server");
}