FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab) - Nessus

High Plugin ID: 138371

This page contains detailed information about the FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 138371
Name: FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab)
Filename: freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl
Vulnerability Published: 2020-07-09
This Plugin Published: 2020-07-10
Last Modification Time: 2021-02-23
Plugin Version: 1.5
Plugin Type: local
Plugin Family: FreeBSD Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/FreeBSD/pkg_info, Host/FreeBSD/release, Host/local_checks_enabled, Settings/ParanoidReport

Vulnerability Information

Severity: High
Vulnerability Published: 2020-07-09
Patch Published: 2020-07-10
CVE [?]: CVE-2020-7457
CPE [?]: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:FreeBSD

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The IPV6_2292PKTOPTIONS set handler was missing synchronization, so racing accesses could modify freed memory. Impact : A malicious user application could trigger memory corruption, leading to privilege escalation.

Solution

Update the affected packages.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab) vulnerability:

Metasploit: exploit/freebsd/local/ip6_setpktopt_uaf_priv_esc
[FreeBSD ip6_setpktopt Use-After-Free Privilege Escalation]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

Risk Information

CVSS Score Source [?]: CVE-2020-7457
CVSS V2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:C

CVSS Base Score:	6.8 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	8.6
CVSS Temporal Score:	5.6 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.6 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:	8.1 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.2
CVSS Temporal Score:	7.5 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.5 (High)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2021 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(138371);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/02/23");

  script_cve_id("CVE-2020-7457");
  script_xref(name:"FreeBSD", value:"SA-20:20.ipv6");

  script_name(english:"FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab)");
  script_summary(english:"Checks for updated packages in pkg_info output");

  script_set_attribute(
    attribute:"synopsis",
    value:
"The remote FreeBSD host is missing one or more security-related
updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"The IPV6_2292PKTOPTIONS set handler was missing synchronization, so
racing accesses could modify freed memory. Impact : A malicious user
application could trigger memory corruption, leading to privilege
escalation."
  );
  # https://vuxml.freebsd.org/freebsd/c11ee146-c266-11ea-8659-901b0ef719ab.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?dc849220"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected 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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-7457");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'FreeBSD ip6_setpktopt Use-After-Free Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:FreeBSD");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/10");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info", "Settings/ParanoidReport");

  exit(0);
}


include("audit.inc");
include("freebsd_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


if (report_paranoia < 2) audit(AUDIT_PARANOID);

flag = 0;

if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=12.1<12.1_7")) flag++;
if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=11.4<11.4_1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=11.3<11.3_11")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:pkg_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl

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How to Run

Here is how to run the FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select FreeBSD Local Security Checks plugin family.
On the right side table select FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab) plugin ID 138371.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl -t <IP/HOST>

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References

FreeBSD Security Advisory:

SA-20:20.ipv6

See also:

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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file freebsd_pkg_c11ee146c26611ea8659901b0ef719ab.nasl version 1.5. For more plugins, visit the Nessus Plugin Library.

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FreeBSD : FreeBSD -- IPv6 socket option race condition and use after free (c11ee146-c266-11ea-8659-901b0ef719ab) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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