Azure Linux 3.0 Security Update: edk2 / hvloader / openssl (CVE-2024-4741)

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

include('compat.inc');

if (description)
{
  script_id(234630);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/15");

  script_cve_id("CVE-2024-4741");
  script_xref(name:"IAVA", value:"2024-A-0321-S");

  script_name(english:"Azure Linux 3.0 Security Update: edk2 / hvloader / openssl (CVE-2024-4741)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Azure Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The version of edk2 / hvloader / openssl installed on the remote Azure Linux 3.0 host is prior to tested version. It is,
therefore, affected by a vulnerability as referenced in the CVE-2024-4741 advisory.

  - Issue summary: Calling the OpenSSL API function SSL_free_buffers May cause memory to be accessed that was
    previously freed in some situations Impact summary: A use after free can have a range of potential
    consequences such as the corruption of valid data, crashes or execution of arbitrary code. However, only
    applications that directly call the SSL_free_buffers function are affected by this issue. Applications
    that do not call this function are not vulnerable. Our investigations indicate that this function is
    rarely used by applications. The SSL_free_buffers function is used to free the internal OpenSSL buffer
    used when processing an incoming record from the network. The call is only expected to succeed if the
    buffer is not currently in use. However, two scenarios have been identified where the buffer is freed even
    when still in use. The first scenario occurs where a record header has been received from the network and
    processed by OpenSSL, but the full record body has not yet arrived. In this case calling SSL_free_buffers
    will succeed even though a record has only been partially processed and the buffer is still in use. The
    second scenario occurs where a full record containing application data has been received and processed by
    OpenSSL but the application has only read part of this data. Again a call to SSL_free_buffers will succeed
    even though the buffer is still in use. While these scenarios could occur accidentally during normal
    operation a malicious attacker could attempt to engineer a stituation where this occurs. We are not aware
    of this issue being actively exploited. The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this
    issue. (CVE-2024-4741)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-4741");
  script_set_attribute(attribute:"solution", value:
"Update the affected 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:N/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-2024-4741");

  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:"2024/05/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/04/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-experimental");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-ext4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-hvloader");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-ovmf");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-ovmf-ia32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-ovmf-xen");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-tools-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:edk2-tools-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:hvloader");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:openssl-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:openssl-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:openssl-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:microsoft:azure_linux:openssl-static");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:microsoft:azure_linux");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Azure Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AzureLinux/release", "Host/AzureLinux/rpm-list", "Host/cpu");

  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/AzureLinux/release');
if (isnull(release) || 'Azure Linux' >!< release) audit(AUDIT_OS_NOT, 'Azure Linux');
var os_ver = pregmatch(pattern: "Azure Linux ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Azure Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^3([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Azure Linux 3.0', 'Azure Linux ' + os_ver);

if (!get_kb_item('Host/AzureLinux/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)
  audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Azure Linux', cpu);

var pkgs = [
    {'reference':'edk2-debuginfo-20240524git3e722403cd16-6.azl3', 'cpu':'x86_64', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-experimental-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-ext4-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-hvloader-20240524git3e722403cd16-6.azl3', 'cpu':'x86_64', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-ovmf-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-ovmf-ia32-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-ovmf-xen-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-tools-20240524git3e722403cd16-6.azl3', 'cpu':'x86_64', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-tools-doc-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'edk2-tools-python-20240524git3e722403cd16-6.azl3', 'release':'3.0', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'Azure Linux ' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, 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, 'edk2-debuginfo / edk2-experimental / edk2-ext4 / edk2-hvloader / etc');
}