EulerOS Virtualization 2.12.1 : python3 (EulerOS-SA-2026-3609)

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

include('compat.inc');

if (description)
{
  script_id(347223);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/18");

  script_cve_id(
    "CVE-2026-2297",
    "CVE-2026-3644",
    "CVE-2026-4224",
    "CVE-2026-4519",
    "CVE-2026-6019",
    "CVE-2026-6100",
    "CVE-2026-7210",
    "CVE-2026-7774",
    "CVE-2026-9669",
    "CVE-2026-11940"
  );

  script_name(english:"EulerOS Virtualization 2.12.1 : python3 (EulerOS-SA-2026-3609)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the python3 packages installed, the EulerOS Virtualization installation on the remote host
is affected by the following vulnerabilities :

    `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding
    protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this
    vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.(CVE-2026-7210)

    tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or
    directory-like names, to redirect later archive members outside the intended extraction directory. This
    allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination
    directory, subject to the permissions of the extracting process.(CVE-2026-7774)

    tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a
    hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback
    validated the symlink at its archived location but recreated it at the hardlink's shallower path, letting
    a relative target the filter judged contained escape the destination directory. This allowed a malicious
    tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads
    or writes. This was an incomplete fix of CVE-2025-4330.(CVE-2026-11940)

    When an Expat parser with a registered ElementDeclHandler parses an inline document type definition
    containing a deeply nested content model a C stack overflow occurs.(CVE-2026-4224)

    http.cookies.Morsel.js_output() returns an inline script snippet and only escapes ' for JavaScript
    string context. It does not neutralize the HTML parser-sensitive sequence /script inside the
    generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie
    value.(CVE-2026-6019)

    Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and
    `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-
    used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the
    dangling pointer in this specific error condition.The vulnerability is only present if the program re-uses
    decompressor instances across multiple decompression calls even after a `MemoryError` is raised during
    decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`,
    `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor
    instance is used per call. If the decompressor instance is not re-used after an error condition, this
    usage is similarly not vulnerable.(CVE-2026-6100)

    The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line
    options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize
    URLs prior to passing to  webbrowser.open().(CVE-2026-4519)

    bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the
    resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to
    resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash
    the process when processing untrusted data.(CVE-2026-9669)

    The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled
    in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers
    for this audit event therefore do not fire.(CVE-2026-2297)

    The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The
    Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass
    input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to
    BaseCookie.output().(CVE-2026-3644)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization python3 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-2026-3609
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8267063f");
  script_set_attribute(attribute:"solution", value:
"Update the affected python3 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:C/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:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-3644");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-6100");

  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:"2026/02/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python3-fgo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:python3-unversioned-command");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.12.1");
  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/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 (uvp != "2.12.1") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.12.1");
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 = [
  "python3-3.9.9-21.h28.eulerosv2r12",
  "python3-fgo-3.9.9-21.h28.eulerosv2r12",
  "python3-unversioned-command-3.9.9-21.h28.eulerosv2r12"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", 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, "python3");
}