NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel-rt Multiple Vulnerabilities (NS-SA-2020-0043)

2020-10-1300:00:00

www.tenable.com

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has kernel-rt packages installed that are affected by multiple vulnerabilities:

In the Linux kernel before 4.1.4, a buffer overflow occurs when checking userspace params in drivers/media/dvb-frontends/cx24116.c. The maximum size for a DiSEqC command is 6, according to the userspace API. However, the code allows larger values such as 23. (CVE-2015-9289)
The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to the current task’s default request-key keyring via the request_key() system call, allowing a local user to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.
(CVE-2017-17807)
An issue was discovered in the Linux kernel before 4.19.9. The USB subsystem mishandles size checks during the reading of an extra descriptor, related to __usb_get_extra_descriptor in drivers/usb/core/usb.c.
(CVE-2018-20169)
In the Linux kernel before 5.2.3, set_geometry in drivers/block/floppy.c does not validate the sect and head fields, as demonstrated by an integer overflow and out-of-bounds read. It can be triggered by an unprivileged local user when a floppy disk has been inserted. NOTE: QEMU creates the floppy device by default. (CVE-2019-14283)
rtl_p2p_noa_ie in drivers/net/wireless/realtek/rtlwifi/ps.c in the Linux kernel through 5.3.6 lacks a certain upper-bound check, leading to a buffer overflow. (CVE-2019-17666)
A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs.
As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it is possible for the specified target task to perform an execve() syscall with setuid execution before perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged execve() calls. This issue affects kernel versions before 4.8. (CVE-2019-3901)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2020-0043. The text
# itself is copyright (C) ZTE, Inc.
##

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

if (description)
{
  script_id(141405);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id(
    "CVE-2015-9289",
    "CVE-2017-17807",
    "CVE-2018-20169",
    "CVE-2019-3901",
    "CVE-2019-14283",
    "CVE-2019-17666"
  );
  script_bugtraq_id(89937, 102301);

  script_name(english:"NewStart CGSL CORE 5.04 / MAIN 5.04 : kernel-rt Multiple Vulnerabilities (NS-SA-2020-0043)");

  script_set_attribute(attribute:"synopsis", value:
"The remote machine is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has kernel-rt packages installed that are affected
by multiple vulnerabilities:

  - In the Linux kernel before 4.1.4, a buffer overflow occurs when checking userspace params in
    drivers/media/dvb-frontends/cx24116.c. The maximum size for a DiSEqC command is 6, according to the
    userspace API. However, the code allows larger values such as 23. (CVE-2015-9289)

  - The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to
    the current task's default request-key keyring via the request_key() system call, allowing a local user
    to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write
    permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.
    (CVE-2017-17807)

  - An issue was discovered in the Linux kernel before 4.19.9. The USB subsystem mishandles size checks during
    the reading of an extra descriptor, related to __usb_get_extra_descriptor in drivers/usb/core/usb.c.
    (CVE-2018-20169)

  - In the Linux kernel before 5.2.3, set_geometry in drivers/block/floppy.c does not validate the sect and
    head fields, as demonstrated by an integer overflow and out-of-bounds read. It can be triggered by an
    unprivileged local user when a floppy disk has been inserted. NOTE: QEMU creates the floppy device by
    default. (CVE-2019-14283)

  - rtl_p2p_noa_ie in drivers/net/wireless/realtek/rtlwifi/ps.c in the Linux kernel through 5.3.6 lacks a
    certain upper-bound check, leading to a buffer overflow. (CVE-2019-17666)

  - A race condition in perf_event_open() allows local attackers to leak sensitive data from setuid programs.
    As no relevant locks (in particular the cred_guard_mutex) are held during the ptrace_may_access() call, it
    is possible for the specified target task to perform an execve() syscall with setuid execution before
    perf_event_alloc() actually attaches to it, allowing an attacker to bypass the ptrace_may_access() check
    and the perf_event_exit_task(current) call that is performed in install_exec_creds() during privileged
    execve() calls. This issue affects kernel versions before 4.8. (CVE-2019-3901)

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://security.gd-linux.com/notice/NS-SA-2020-0043");
  script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL kernel-rt packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
  script_set_cvss_base_vector("CVSS2#AV:A/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:A/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-2019-17666");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/12/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");

  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);

release = get_kb_item('Host/ZTE-CGSL/release');
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, 'NewStart Carrier Grade Server Linux');

if (release !~ "CGSL CORE 5.04" &&
    release !~ "CGSL MAIN 5.04")
  audit(AUDIT_OS_NOT, 'NewStart CGSL CORE 5.04 / NewStart CGSL MAIN 5.04');

if (!get_kb_item('Host/ZTE-CGSL/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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'NewStart Carrier Grade Server Linux', cpu);

flag = 0;

pkgs = {
  'CGSL CORE 5.04': [
    'kernel-rt-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-devel-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-kvm-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-kvm-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debuginfo-common-x86_64-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-devel-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-doc-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-kvm-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-kvm-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-devel-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-kvm-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-kvm-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed'
  ],
  'CGSL MAIN 5.04': [
    'kernel-rt-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-devel-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-kvm-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debug-kvm-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-debuginfo-common-x86_64-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-devel-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-doc-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-kvm-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-kvm-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-devel-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-kvm-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed',
    'kernel-rt-trace-kvm-debuginfo-3.10.0-693.21.1.rt56.639.el7.cgslv5_4.33.429.g62477ed'
  ]
};
pkg_list = pkgs[release];

foreach (pkg in pkg_list)
  if (rpm_check(release:'ZTE ' + release, reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    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, 'kernel-rt');
}