CentOS 4 / 5 : krb5 (CESA-2011:1851) - Nessus

Critical Plugin ID: 57405

This page contains detailed information about the CentOS 4 / 5 : krb5 (CESA-2011:1851) 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: 57405
Name: CentOS 4 / 5 : krb5 (CESA-2011:1851)
Filename: centos_RHSA-2011-1851.nasl
Vulnerability Published: 2011-12-24
This Plugin Published: 2011-12-28
Last Modification Time: 2021-01-04
Plugin Version: 1.13
Plugin Type: local
Plugin Family: CentOS Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/CentOS/release, Host/CentOS/rpm-list, Host/local_checks_enabled

Vulnerability Information

Severity: Critical
Vulnerability Published: 2011-12-24
Patch Published: 2011-12-27
CVE [?]: CVE-2011-4862
CPE [?]: cpe:/o:centos:centos:4, cpe:/o:centos:centos:5, p-cpe:/a:centos:centos:krb5-devel, p-cpe:/a:centos:centos:krb5-libs, p-cpe:/a:centos:centos:krb5-server, p-cpe:/a:centos:centos:krb5-server-ldap, p-cpe:/a:centos:centos:krb5-workstation
Exploited by Malware: True

Synopsis

The remote CentOS host is missing one or more security updates.

Description

Updated krb5 packages that fix one security issue are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having Critical security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third- party, the Key Distribution Center (KDC).

A buffer overflow flaw was found in the MIT krb5 telnet daemon (telnetd). A remote attacker who can access the telnet port of a target machine could use this flaw to execute arbitrary code as root. (CVE-2011-4862)

Note that the krb5 telnet daemon is not enabled by default in any version of Red Hat Enterprise Linux. In addition, the default firewall rules block remote access to the telnet port. This flaw does not affect the telnet daemon distributed in the telnet-server package.

For users who have installed the krb5-workstation package, have enabled the telnet daemon, and have it accessible remotely, this update should be applied immediately.

All krb5-workstation users should upgrade to these updated packages, which contain a backported patch to correct this issue.

Solution

Update the affected krb5 packages.

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 CentOS 4 / 5 : krb5 (CESA-2011:1851) 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 Red Hat Security Advisory RHSA-2011:1851 and 
# CentOS Errata and Security Advisory 2011:1851 respectively.
#

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

if (description)
{
  script_id(57405);
  script_version("1.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2011-4862");
  script_bugtraq_id(51182);
  script_xref(name:"RHSA", value:"2011:1851");

  script_name(english:"CentOS 4 / 5 : krb5 (CESA-2011:1851)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated krb5 packages that fix one security issue are now available
for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having
Critical security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from
the CVE link in the References section.

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other using symmetric encryption and a
trusted third- party, the Key Distribution Center (KDC).

A buffer overflow flaw was found in the MIT krb5 telnet daemon
(telnetd). A remote attacker who can access the telnet port of a
target machine could use this flaw to execute arbitrary code as root.
(CVE-2011-4862)

Note that the krb5 telnet daemon is not enabled by default in any
version of Red Hat Enterprise Linux. In addition, the default firewall
rules block remote access to the telnet port. This flaw does not
affect the telnet daemon distributed in the telnet-server package.

For users who have installed the krb5-workstation package, have
enabled the telnet daemon, and have it accessible remotely, this
update should be applied immediately.

All krb5-workstation users should upgrade to these updated packages,
which contain a backported patch to correct this issue."
  );
  # https://lists.centos.org/pipermail/centos-announce/2011-December/018359.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?e44f57b9"
  );
  # https://lists.centos.org/pipermail/centos-announce/2011-December/018360.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?e476e566"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected krb5 packages.");
  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:centos:centos:krb5-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-server-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-workstation");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:5");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/12/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/12/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/12/28");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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:"CentOS Local Security Checks");

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

  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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^(4|5)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 4.x / 5.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && "ia64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-4", cpu:"i386", reference:"krb5-devel-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"x86_64", reference:"krb5-devel-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"i386", reference:"krb5-libs-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"x86_64", reference:"krb5-libs-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"i386", reference:"krb5-server-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"x86_64", reference:"krb5-server-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"i386", reference:"krb5-workstation-1.3.4-65.el4")) flag++;
if (rpm_check(release:"CentOS-4", cpu:"x86_64", reference:"krb5-workstation-1.3.4-65.el4")) flag++;

if (rpm_check(release:"CentOS-5", reference:"krb5-devel-1.6.1-63.el5_7")) flag++;
if (rpm_check(release:"CentOS-5", reference:"krb5-libs-1.6.1-63.el5_7")) flag++;
if (rpm_check(release:"CentOS-5", reference:"krb5-server-1.6.1-63.el5_7")) flag++;
if (rpm_check(release:"CentOS-5", reference:"krb5-server-ldap-1.6.1-63.el5_7")) flag++;
if (rpm_check(release:"CentOS-5", reference:"krb5-workstation-1.6.1-63.el5_7")) 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, "krb5-devel / krb5-libs / krb5-server / krb5-server-ldap / etc");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/centos_RHSA-2011-1851.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\centos_RHSA-2011-1851.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/centos_RHSA-2011-1851.nasl

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How to Run

Here is how to run the CentOS 4 / 5 : krb5 (CESA-2011:1851) 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 CentOS Local Security Checks plugin family.
On the right side table select CentOS 4 / 5 : krb5 (CESA-2011:1851) plugin ID 57405.
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 centos_RHSA-2011-1851.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a centos_RHSA-2011-1851.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - centos_RHSA-2011-1851.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 centos_RHSA-2011-1851.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

51182

RHSA | Red Hat Security Advisory:

2011:1851

See also:

Similar and related Nessus plugins:

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)
57403 - FreeBSD : krb5-appl -- telnetd code execution vulnerability (4ddc78dc-300a-11e1-a2aa-0016ce01e285)
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 centos_RHSA-2011-1851.nasl version 1.13. For more plugins, visit the Nessus Plugin Library.

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CentOS 4 / 5 : krb5 (CESA-2011:1851) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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