GLSA-202401-08 : util-linux: Multiple Vulnerabilities

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# @NOAGENT@
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 202401-08.
#
# The advisory text is Copyright (C) 2001-2021 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include('compat.inc');

if (description)
{
  script_id(187668);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/07");

  script_cve_id(
    "CVE-2021-3995",
    "CVE-2021-3996",
    "CVE-2021-37600",
    "CVE-2022-0563"
  );

  script_name(english:"GLSA-202401-08 : util-linux: Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"");
  script_set_attribute(attribute:"description", value:
"The remote host is affected by the vulnerability described in GLSA-202401-08 (util-linux: Multiple Vulnerabilities)

  - A logic error was found in the libmount library of util-linux in the function that allows an unprivileged
    user to unmount a FUSE filesystem. This flaw allows an unprivileged local attacker to unmount FUSE
    filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker
    in its string form. An attacker may use this flaw to cause a denial of service to applications that use
    the affected filesystems. (CVE-2021-3995)

  - A logic error was found in the libmount library of util-linux in the function that allows an unprivileged
    user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other
    users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable
    directory. An attacker may use this flaw to cause a denial of service to applications that use the
    affected filesystems. (CVE-2021-3996)

  - An integer overflow in util-linux through 2.37.1 can potentially cause a buffer overflow if an attacker
    were able to use system resources in a way that leads to a large number in the /proc/sysvipc/sem file.
    NOTE: this is unexploitable in GNU C Library environments, and possibly in all realistic environments
    (CVE-2021-37600)

  - A flaw was found in the util-linux chfn and chsh utilities when compiled with Readline support. The
    Readline library uses an INPUTRC environment variable to get a path to the library config file. When the
    library cannot parse the specified file, it prints an error message containing data from the file. This
    flaw allows an unprivileged user to read root-owned files, potentially leading to privilege escalation.
    This flaw affects util-linux versions prior to 2.37.4. (CVE-2022-0563)

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://security.gentoo.org/glsa/202401-08");
  script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=806070");
  script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=831978");
  script_set_attribute(attribute:"see_also", value:"https://bugs.gentoo.org/show_bug.cgi?id=833365");
  script_set_attribute(attribute:"solution", value:
"All util-linux users should upgrade to the latest version:

          # emerge --sync
          # emerge --ask --oneshot --verbose >=sys-apps/util-linux-2.37.4");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-0563");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/01/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/01/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:util-linux");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 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/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}
include('qpkg.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item('Host/Gentoo/release')) audit(AUDIT_OS_NOT, 'Gentoo');
if (!get_kb_item('Host/Gentoo/qpkg-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var flag = 0;

var packages = [
  {
    'name' : 'sys-apps/util-linux',
    'unaffected' : make_list("ge 2.37.4"),
    'vulnerable' : make_list("lt 2.37.4")
  }
];

foreach var package( packages ) {
  if (isnull(package['unaffected'])) package['unaffected'] = make_list();
  if (isnull(package['vulnerable'])) package['vulnerable'] = make_list();
  if (qpkg_check(package: package['name'] , unaffected: package['unaffected'], vulnerable: package['vulnerable'])) flag++;
}


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : qpkg_report_get()
  );
  exit(0);
}
else
{
  qpkg_tests = list_uniq(qpkg_tests);
  var tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'util-linux');
}