Oracle Linux 5 / 6 : ecryptfs-utils (ELSA-2011-1241)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2011:1241 and 
# Oracle Linux Security Advisory ELSA-2011-1241 respectively.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(68338);
  script_version("1.14");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/16");

  script_cve_id(
    "CVE-2011-1831",
    "CVE-2011-1832",
    "CVE-2011-1834",
    "CVE-2011-1835",
    "CVE-2011-1837",
    "CVE-2011-3145"
  );
  script_bugtraq_id(49108, 49287);
  script_xref(name:"RHSA", value:"2011:1241");

  script_name(english:"Oracle Linux 5 / 6 : ecryptfs-utils (ELSA-2011-1241)");

  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 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in
the ELSA-2011-1241 advisory.

  - utils/mount.ecryptfs_private.c in ecryptfs-utils before 90 does not properly check mountpoint permissions,
    which allows local users to effectively replace any directory with a new filesystem, and consequently gain
    privileges, via a mount system call. (CVE-2011-1831)

  - utils/mount.ecryptfs_private.c in ecryptfs-utils before 90 does not properly check mountpoint permissions,
    which allows local users to remove directories via a umount system call. (CVE-2011-1832)

  - utils/mount.ecryptfs_private.c in ecryptfs-utils before 90 does not properly maintain the mtab file during
    error conditions, which allows local users to cause a denial of service (table corruption) or bypass
    intended unmounting restrictions via a umount system call. (CVE-2011-1834)

  - The encrypted private-directory setup process in utils/ecryptfs-setup-private in ecryptfs-utils before 90
    does not properly ensure that the passphrase file is created, which might allow local users to bypass
    intended access restrictions at a certain time in the new-user creation steps. (CVE-2011-1835)

  - The lock-counter implementation in utils/mount.ecryptfs_private.c in ecryptfs-utils before 90 allows local
    users to overwrite arbitrary files via unspecified vectors. (CVE-2011-1837)

  - When mount.ecrpytfs_private before version 87-0ubuntu1.2 calls setreuid() it doesn't also set the
    effective group id. So when it creates the new version, mtab.tmp, it's created with the group id of the
    user running mount.ecryptfs_private. (CVE-2011-3145)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2011-1241.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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: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-2011-3145");

  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:"2012/10/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/09/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ecryptfs-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ecryptfs-utils-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ecryptfs-utils-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:ecryptfs-utils-python");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2013-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


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');
var os_release = get_kb_item("Host/RedHat/release");
if (isnull(os_release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:os_release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
os_ver = os_ver[1];
if (! preg(pattern:"^(5|6)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 5 / 6', 'Oracle Linux ' + os_ver);

if (!get_kb_item('Host/RedHat/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, 'Oracle Linux', cpu);

var pkgs = [
    {'reference':'ecryptfs-utils-75-5.el5_7.2', 'cpu':'i386', 'release':'5', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-devel-75-5.el5_7.2', 'cpu':'i386', 'release':'5', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-gui-75-5.el5_7.2', 'cpu':'i386', 'release':'5', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-75-5.el5_7.2', 'cpu':'x86_64', 'release':'5', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-devel-75-5.el5_7.2', 'cpu':'x86_64', 'release':'5', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-gui-75-5.el5_7.2', 'cpu':'x86_64', 'release':'5', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-82-6.el6_1.3', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-devel-82-6.el6_1.3', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-python-82-6.el6_1.3', 'cpu':'i686', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-82-6.el6_1.3', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-devel-82-6.el6_1.3', 'cpu':'x86_64', 'release':'6', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'ecryptfs-utils-python-82-6.el6_1.3', 'cpu':'x86_64', 'release':'6', '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;
  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['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && _release) {
    if (exists_check) {
        if (rpm_exists(release:_release, rpm:exists_check) && 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_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, 'ecryptfs-utils / ecryptfs-utils-devel / ecryptfs-utils-gui / etc');
}