FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285) - Nessus

Critical Plugin ID: 57403

This page contains detailed information about the FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285) 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: 57403
Name: FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285)
Filename: freebsd_pkg_4ddc78dc300a11e1a2aa0016ce01e285.nasl
Vulnerability Published: 2011-12-23
This Plugin Published: 2011-12-27
Last Modification Time: 2021-01-06
Plugin Version: 1.19
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

Vulnerability Information

Severity: Critical
Vulnerability Published: 2011-12-23
Patch Published: 2011-12-26
CVE [?]: CVE-2011-4862
CPE [?]: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:krb5-appl
Exploited by Malware: True

Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The MIT Kerberos Team reports :

When an encryption key is supplied via the TELNET protocol, its length is not validated before the key is copied into a fixed-size buffer. Also see MITKRB5-SA-2011-008.

Solution

Update the affected package.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub, ExploitHub, Core Impact)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285) vulnerability:

Metasploit: exploit/linux/telnet/telnet_encrypt_keyid
[Linux BSD-derived Telnet Service Encryption Key ID Buffer Overflow]
Metasploit: exploit/freebsd/telnet/telnet_encrypt_keyid
[FreeBSD Telnet Service Encryption Key ID Buffer Overflow]
Metasploit: auxiliary/scanner/telnet/telnet_encrypt_overflow
[Telnet Service Encryption Key ID Overflow Detection]
Exploit-DB: exploits/linux/remote/18368.rb
[EDB-18368: Linux BSD-derived Telnet Service Encryption Key ID - Remote Buffer Overflow (Metasploit)]
Exploit-DB: exploits/bsd/remote/18369.rb
[EDB-18369: FreeBSD - Telnet Service Encryption Key ID Buffer Overflow (Metasploit)]
GitHub: https://github.com/Snoopy-Sec/Localroot-ALL-CVE
[CVE-2011-4862]
GitHub: https://github.com/anoaghost/Localroot_Compile
[CVE-2011-4862]
GitHub: https://github.com/hdbreaker/GO-CVE-2011-4862
[CVE-2011-4862: Go Exploit for CVE-2011-4862]
GitHub: https://github.com/kpawar2410/CVE-2011-4862
[CVE-2011-4862: Final Project for Security and Privacy CS 600.443]
GitHub: https://github.com/lol-fi/cve-2011-4862
[CVE-2011-4862]
ExploitHub: EH-11-760

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.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	8.3 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.3 (High)

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 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('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(57403);
  script_version("1.19");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id("CVE-2011-4862");
  script_bugtraq_id(51182);
  script_xref(name:"FreeBSD", value:"SA-11:08.telnetd");

  script_name(english:"FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The MIT Kerberos Team reports :

When an encryption key is supplied via the TELNET protocol, its length
is not validated before the key is copied into a fixed-size buffer.
Also see MITKRB5-SA-2011-008."
  );
  # http://security.FreeBSD.org/advisories/FreeBSD-SA-11:08.telnetd.asc
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?bcb80033"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-008.txt"
  );
  # https://vuxml.freebsd.org/freebsd/4ddc78dc-300a-11e1-a2aa-0016ce01e285.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f6a55198"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploithub_sku", value:"EH-11-760");
  script_set_attribute(attribute:"exploit_framework_exploithub", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Linux BSD-derived Telnet Service Encryption Key ID Buffer Overflow');
  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:krb5-appl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/12/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/12/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/12/27");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2021 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");

  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);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"krb5-appl<1.0.2_1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get());
  else security_hole(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_4ddc78dc300a11e1a2aa0016ce01e285.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\freebsd_pkg_4ddc78dc300a11e1a2aa0016ce01e285.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/freebsd_pkg_4ddc78dc300a11e1a2aa0016ce01e285.nasl

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How to Run

Here is how to run the FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285) 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 : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285) plugin ID 57403.
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_4ddc78dc300a11e1a2aa0016ce01e285.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a freebsd_pkg_4ddc78dc300a11e1a2aa0016ce01e285.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_4ddc78dc300a11e1a2aa0016ce01e285.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_4ddc78dc300a11e1a2aa0016ce01e285.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

51182

FreeBSD Security Advisory:

SA-11:08.telnetd

See also:

Similar and related Nessus plugins:

57405 - CentOS 4 / 5 : krb5 (CESA-2011:1851)
57406 - CentOS 6 : krb5-appl (CESA-2011:1852)
79271 - Cisco Email Security Appliance Telnet Remote Code Execution (cisco-sa-20120126-ironport)
79272 - Cisco Content Security Management Appliance Telnet Remote Code Execution (cisco-sa-20120126-ironport)
79273 - Cisco Web Security Appliance Telnet Remote Code Execution (cisco-sa-20120126-ironport)
57512 - Debian DSA-2372-1 : heimdal - buffer overflow
57513 - Debian DSA-2373-1 : inetutils - buffer overflow
57515 - Debian DSA-2375-1 : krb5, krb5-appl - buffer overflow
57442 - Fedora 15 : krb5-appl-1.0.1-8.fc15 (2011-17492)
57443 - Fedora 16 : krb5-appl-1.0.2-2.fc16 (2011-17493)
57656 - GLSA-201201-14 : MIT Kerberos 5 Applications: Multiple vulnerabilities
58101 - GLSA-201202-05 : Heimdal: Arbitrary code execution
57412 - Mandriva Linux Security Advisory : krb5-appl (MDVSA-2011:195)
74578 - openSUSE Security Update : krb5-appl (openSUSE-2012-17)
68412 - Oracle Linux 4 / 5 : krb5 (ELSA-2011-1851)
68413 - Oracle Linux 6 : krb5-appl (ELSA-2011-1852)
79475 - OracleVM 2.2 : krb5 (OVMSA-2011-0015)
57408 - RHEL 4 / 5 : krb5 (RHSA-2011:1851)
57409 - RHEL 6 : krb5-appl (RHSA-2011:1852)
64017 - RHEL 5 : krb5 (RHSA-2011:1853)
64018 - RHEL 6 : krb5-appl (RHSA-2011:1854)
61213 - Scientific Linux Security Update : krb5-appl on SL6.x i386/x86_64
61214 - Scientific Linux Security Update : krb5 on SL4.x, SL5.x i386/x86_64
80781 - Oracle Solaris Third-Party Patch Update : telnet (cve_2011_4862_buffer_overflow)
75564 - openSUSE Security Update : krb5-appl (openSUSE-SU-2012:0019-1)
75886 - openSUSE Security Update : krb5-appl (openSUSE-SU-2012:0019-1)
57430 - SuSE 11.1 Security Update : Kerberos 5 (SAT Patch Number 5594)
57431 - SuSE 10 Security Update : Kerberos 5 (ZYPP Patch Number 7899)
57462 - FreeBSD 'telnetd' Daemon Remote Buffer Overflow
58535 - VMSA-2012-0006 : VMware Workstation, ESXi, and ESX address several security issues
89107 - VMware ESX / ESXi Multiple Vulnerabilities (VMSA-2012-0006) (remote check)
68477 - Oracle Linux 5 : krb5 (ELSA-2012-0306)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file freebsd_pkg_4ddc78dc300a11e1a2aa0016ce01e285.nasl version 1.19. For more plugins, visit the Nessus Plugin Library.

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FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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