Oracle Linux 7 : libexif (ELSA-2020-4040)

##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2020-4040.
##

include('compat.inc');

if (description)
{
  script_id(141222);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/10/09");

  script_cve_id(
    "CVE-2019-9278",
    "CVE-2020-0093",
    "CVE-2020-0182",
    "CVE-2020-12767",
    "CVE-2020-13113",
    "CVE-2020-13114"
  );

  script_name(english:"Oracle Linux 7 : libexif (ELSA-2020-4040)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ELSA-2020-4040 advisory.

  - In libexif, there is a possible out of bounds write due to an integer overflow. This could lead to remote
    escalation of privilege in the media content provider with no additional execution privileges needed. User
    interaction is needed for exploitation. Product: AndroidVersions: Android-10Android ID: A-112537774
    (CVE-2019-9278)

  - In exif_data_save_data_entry of exif-data.c, there is a possible out of bounds read due to a missing
    bounds check. This could lead to local information disclosure with no additional execution privileges
    needed. User interaction is needed for exploitation.Product: AndroidVersions: Android-8.0 Android-8.1
    Android-9 Android-10Android ID: A-148705132 (CVE-2020-0093)

  - In exif_entry_get_value of exif-entry.c, there is a possible out of bounds read due to a missing bounds
    check. This could lead to local information disclosure with no additional execution privileges needed.
    User interaction is not needed for exploitation.Product: AndroidVersions: Android-10Android ID:
    A-147140917 (CVE-2020-0182)

  - exif_entry_get_value in exif-entry.c in libexif 0.6.21 has a divide-by-zero error. (CVE-2020-12767)

  - An issue was discovered in libexif before 0.6.22. Use of uninitialized memory in EXIF Makernote handling
    could lead to crashes and potential use-after-free conditions. (CVE-2020-13113)

  - An issue was discovered in libexif before 0.6.22. An unrestricted size in handling Canon EXIF MakerNote
    data could lead to consumption of large amounts of compute time for decoding EXIF data. (CVE-2020-13114)

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:"http://linux.oracle.com/errata/ELSA-2020-4040.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected libexif, libexif-devel and / or libexif-doc packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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:R/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-2019-9278");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libexif");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libexif-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:libexif-doc");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");

  exit(0);
}


include('audit.inc');
include('global_settings.inc');
include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 7', 'Oracle Linux ' + os_ver);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

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, 'Oracle Linux', cpu);

pkgs = [
    {'reference':'libexif-0.6.22-1.el7', 'cpu':'aarch64', 'release':'7'},
    {'reference':'libexif-0.6.22-1.el7', 'cpu':'i686', 'release':'7'},
    {'reference':'libexif-0.6.22-1.el7', 'cpu':'x86_64', 'release':'7'},
    {'reference':'libexif-devel-0.6.22-1.el7', 'cpu':'aarch64', 'release':'7'},
    {'reference':'libexif-devel-0.6.22-1.el7', 'cpu':'i686', 'release':'7'},
    {'reference':'libexif-devel-0.6.22-1.el7', 'cpu':'x86_64', 'release':'7'},
    {'reference':'libexif-doc-0.6.22-1.el7', 'cpu':'aarch64', 'release':'7'},
    {'reference':'libexif-doc-0.6.22-1.el7', 'cpu':'x86_64', 'release':'7'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  sp = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  epoch = NULL;
  allowmaj = NULL;
  rpm_prefix = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = 'EL' + 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['rpm_prefix'])) rpm_prefix = package_array['rpm_prefix'];
  if (reference && release) {
    if (rpm_prefix) {
        if (rpm_exists(release:release, rpm:rpm_prefix) && 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)) flag++;
    } else {
        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)) flag++;
    }
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libexif / libexif-devel / libexif-doc');
}