EulerOS 2.0 SP12 : openssl (EulerOS-SA-2026-3288)

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

include('compat.inc');

if (description)
{
  script_id(343737);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/08");

  script_cve_id(
    "CVE-2026-7383",
    "CVE-2026-9076",
    "CVE-2026-34180",
    "CVE-2026-45447"
  );

  script_name(english:"EulerOS 2.0 SP12 : openssl (EulerOS-SA-2026-3288)");

  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 openssl packages installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :

    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: 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: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)
    processes attacker-supplied CMS data, an attacker-chosen stream-mode KEK
    cipher can trigger a heap out-of-bounds read in kek_unwrap_key().

    Impact summary: A heap buffer over-read may trigger a crash which leads to
    Denial of Service for an application if the input buffer ends at a memory
    page boundary and the following page is unmapped. There is no information
    disclosure as the over-read bytes are not revealed to the attacker.

    The key unwrapping function performs a check-byte test as specified in the
    RFC that reads 7 bytes from a heap allocation that is based on the wrapped
    key length from the message. There is a minimum length check based on the
    block length of the wrapping cipher. However the cipher is selected from
    an OID carried in the attacker's PWRI keyEncryptionAlgorithm with no
    requirement that the cipher be a block cipher. When an attacker selects
    a stream-mode cipher the guard will be ineffective and the allocated buffer
    containing the unwrapped key can be too small to fit the check-bytes
    specified in the RFC and a buffer over-read can happen.

    Applications calling CMS_decrypt() or CMS_decrypt_set1_password()
    (equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS
    data are vulnerable to this issue. No password knowledge is required: the
    over-read happens during the unwrap attempt before any authentication
    succeeds.

    The over-read is limited to a few bytes and is not written to output, so
    there is no information disclosure. Triggering a crash requires the
    allocation to border unmapped memory, which is unlikely with the normal
    allocator.

    The FIPS modules are not affected by this issue.(CVE-2026-9076)

    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 openssl 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-2026-3288
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?36e31f2b");
  script_set_attribute(attribute:"solution", value:
"Update the affected openssl 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:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssl-1.1.1m");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssl-devel-1.1.1m");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssl-help-1.1.1m");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssl-libs-1.1.1m");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:openssl-perl-1.1.1m");
  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$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "x86" >!< cpu) audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

var flag = 0;

var pkgs = [
  "openssl-1.1.1m-15.h59.eulerosv2r12",
  "openssl-devel-1.1.1m-15.h59.eulerosv2r12",
  "openssl-help-1.1.1m-15.h59.eulerosv2r12",
  "openssl-libs-1.1.1m-15.h59.eulerosv2r12",
  "openssl-perl-1.1.1m-15.h59.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, "openssl");
}