EulerOS Virtualization 2.10.0 : shim (EulerOS-SA-2026-3889)

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

include('compat.inc');

if (description)
{
  script_id(348539);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/21");

  script_cve_id("CVE-2026-7383", "CVE-2026-34180", "CVE-2026-45447");

  script_name(english:"EulerOS Virtualization 2.10.0 : shim (EulerOS-SA-2026-3889)");

  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 shim package installed, the EulerOS Virtualization installation on the remote host is
affected by the following vulnerabilities :

    Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content
    exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms.
    Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into
    the decoded ASN.1 object contents of memory beyond the end of the input buffer.  More typically such ASN.1
    elements would instead be truncated.An integer truncation in OpenSSL's ASN.1 decoder causes the content
    length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the
    truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly
    causing OpenSSL to read either less than or beyond the end of the allocated buffer.Applications that pass
    attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected.
    OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before
    it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms
    and 64-bit Windows are not affected.The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by
    this issue,as the affected code is outside the OpenSSL FIPS module boundary.(CVE-2026-34180)

    Issue summary: A signed integer overflow when sizing the destination buffer for Unicode output in
    ASN1_mbstring_ncopy() can lead to a heap buffer overflow.Impact summary: A heap buffer overflow may lead
    to a crash or possibly attacker controlled code execution or other undefined behaviour.In
    ASN1_mbstring_copy() and ASN1_mbstring_ncopy() the destination size for Unicode output is computed in a
    signed int: by left shift of the input character count for BMPSTRING (UTF-16) and UNIVERSALSTRING
    (UTF-32), and by summing per-character byte counts for UTF8STRING. The calculation overflows when the
    input reaches around 2^30 characters. In the worst case (UNIVERSALSTRING at 2^30 characters) the size
    wraps to zero, OPENSSL_malloc(1) is called, and the subsequent character copy writes several gigabytes
    past the one-byte allocation.X.509 certificate processing routes through ASN1_STRING_set_by_NID(),whose
    DIRSTRING_TYPE mask excludes UNIVERSALSTRING and whose per-NID size limits cap the input length; no
    network protocol or certificate-handling path in OpenSSL exercises the overflow.Triggering the bug
    requires an application that calls ASN1_mbstring_copy() or ASN1_mbstring_ncopy() directly, or registers a
    custom string type via ASN1_STRING_TABLE_add(), with
    attacker-controlled input on the order of half a gigabyte or more.For these reasons this issue was
    assigned Low severity.The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as
    the affected code is outside the OpenSSL FIPS module
    boundary.(CVE-2026-7383)

    Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during
    PKCS#7 signature verification.Impact summary: A use-after-free may result in process crashes, heap
    corruption, or potentially remote code execution.When processing a PKCS#7 or S/MIME signed message, if the
    SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-
    owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-
    after-free condition.In the common case this occurs when the application later calls BIO_free() on the BIO
    originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage
    patterns, this may result in a crash or other memory corruption. In some application contexts this may
    potentially be exploitable for remote code execution.Applications that process PKCS#7 or S/MIME signed
    messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this
    processing are not affected.The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this
    issue, as the affected code is outside the OpenSSL FIPS module boundary.(CVE-2026-45447)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization shim 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-2026-3889
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ea1b5c0f");
  script_set_attribute(attribute:"solution", value:
"Update the affected shim packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:H/PR:N/UI:N/S:U/C:H/I:H/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-2026-45447");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-7383");

  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:"2026/06/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:shim");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.10.0");
  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/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 != "2.10.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.10.0");
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$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "x86" >!< cpu) audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

var flag = 0;

var pkgs = [
  "shim-15-20.h23.eulerosv2r10"
];

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, "shim");
}