SSH Malformed Packet Vulnerabilities - Cisco Systems - Nessus

Critical Plugin ID: 48968

This page contains detailed information about the SSH Malformed Packet Vulnerabilities - Cisco Systems 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: 48968
Name: SSH Malformed Packet Vulnerabilities - Cisco Systems
Filename: cisco-sa-20021219-ssh-packethttp.nasl
Vulnerability Published: 2002-12-16
This Plugin Published: 2010-09-01
Last Modification Time: 2018-11-15
Plugin Version: 1.20
Plugin Type: local
Plugin Family: CISCO
Dependencies: cisco_ios_version.nasl
Required KB Items [?]: Host/Cisco/IOS/Version

Vulnerability Information

Severity: Critical
Vulnerability Published: 2002-12-16
Patch Published: 2002-12-19
CVE [?]: CVE-2002-1357, CVE-2002-1358, CVE-2002-1359, CVE-2002-1360
CPE [?]: cpe:/o:cisco:ios

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

Certain Cisco products containing support for the Secure Shell (SSH) server are vulnerable to a Denial of Service (DoS) if the SSH server is enabled on the device. A malformed SSH packet directed at the affected device can cause a reload of the device. No authentication is necessary for the packet to be received by the affected device. The SSH server in Cisco IOS is disabled by default.

Cisco will be making free software available to correct the problem as soon as possible.

The malformed packets can be generated using the SSHredder test suite from Rapid7, Inc. Workarounds are available. The Cisco PSIRT is not aware of any malicious exploitation of this vulnerability.

Solution

Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20021219-ssh-packet

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the SSH Malformed Packet Vulnerabilities - Cisco Systems vulnerability:

Metasploit: exploit/windows/ssh/putty_msg_debug
[PuTTY Buffer Overflow]
Exploit-DB: exploits/windows/remote/1788.pm
[EDB-1788: PuTTy.exe 0.53 - Validation Remote Buffer Overflow (Metasploit)]
Exploit-DB: exploits/windows/remote/16463.rb
[EDB-16463: PuTTy.exe 0.53 - Remote Buffer Overflow (Metasploit)]
GitHub: https://github.com/kaleShashi/PuTTY
[CVE-2002-1357]
GitHub: https://github.com/pbr94/PuTTy-
[CVE-2002-1357]
GitHub: https://github.com/kaleShashi/PuTTY
[CVE-2002-1359]
GitHub: https://github.com/pbr94/PuTTy-
[CVE-2002-1359]
GitHub: https://github.com/kaleShashi/PuTTY
[CVE-2002-1360]
GitHub: https://github.com/pbr94/PuTTy-
[CVE-2002-1360]

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

#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#
# Security advisory is (C) CISCO, Inc.
# See https://www.cisco.com/en/US/products/products_security_advisory09186a008011c3b4.shtml

include("compat.inc");

if (description)
{
  script_id(48968);
  script_version("1.20");
  script_set_attribute(attribute:"plugin_modification_date", value:"2018/11/15");

  script_cve_id("CVE-2002-1357", "CVE-2002-1358", "CVE-2002-1359", "CVE-2002-1360");
  script_bugtraq_id(6405, 6407, 6408, 6410);
  script_xref(name:"CERT-CC", value:"389665");
  script_xref(name:"CERT-CC", value:"CA-2002-36");
  script_xref(name:"CISCO-BUG-ID", value:"CSCdu75477");
  script_xref(name:"CISCO-BUG-ID", value:"CSCdy87221");
  script_xref(name:"CISCO-BUG-ID", value:"CSCdz07673");
  script_xref(name:"CISCO-BUG-ID", value:"CSCdz60229");
  script_xref(name:"CISCO-BUG-ID", value:"CSCdz62330");
  script_xref(name:"CISCO-BUG-ID", value:"CSCdz66748");
  script_xref(name:"CISCO-BUG-ID", value:"CSCeb16775");
  script_xref(name:"CISCO-BUG-ID", value:"CSCed38362");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20021219-ssh-packet");

  script_name(english:"SSH Malformed Packet Vulnerabilities - Cisco Systems");
  script_summary(english:"Checks IOS version");

  script_set_attribute(attribute:"synopsis", value:"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"Certain Cisco products containing support for the Secure Shell (SSH)
server are vulnerable to a Denial of Service (DoS) if the SSH server is
enabled on the device. A malformed SSH packet directed at the affected
device can cause a reload of the device. No authentication is necessary
for the packet to be received by the affected device. The SSH server in
Cisco IOS is disabled by default.

Cisco will be making free software available to correct the problem as
soon as possible.

The malformed packets can be generated using the SSHredder test suite
from Rapid7, Inc. Workarounds are available. The Cisco PSIRT is not
aware of any malicious exploitation of this vulnerability.");
  script_set_attribute(attribute:"see_also", value:"http://www.rapid7.com/security-center/advisories/R7-0009.jsp");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20021219-ssh-packet
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cc3e11cf");
  # https://www.cisco.com/en/US/products/products_security_advisory09186a008011c3b4.shtml
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4184156c");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant patch referenced in Cisco Security Advisory
cisco-sa-20021219-ssh-packet");
  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:"metasploit_name", value:'PuTTY Buffer Overflow');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2002/12/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2002/12/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2010/09/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is (C) 2010-2018 Tenable Network Security, Inc.");
  script_family(english:"CISCO");

  script_dependencie("cisco_ios_version.nasl");
  script_require_keys("Host/Cisco/IOS/Version");
  exit(0);
}

include("audit.inc");
include("cisco_func.inc");
include("cisco_kb_cmd_func.inc");

flag = 0;
report_extra = "";
version = get_kb_item_or_exit("Host/Cisco/IOS/Version");
override = 0;

# Affected: 12.0S
if (check_release(version: version,
                  patched: make_list("12.0(21)S6", "12.0(22)S4", "12.0(23)S2"),
                  oldest: "12.0(5)S")) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}
# Affected: 12.0ST
if (check_release(version: version,
                  patched: make_list("12.0(20)ST7", "12.0(21)ST6"),
                  oldest: "12.0(16)ST")) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}
# Affected: 12.1E
if (check_release(version: version,
                  patched: make_list("12.1(13)E3", "12.1(14)E1"),
                  oldest: "12.1(5a)E")) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}
# Affected: 12.1EA
if (check_release(version: version,
                  patched: make_list("12.1(13)EA1") )) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}
# Affected: 12.1T
if (deprecated_version(version, "12.1T")) {
 report_extra = '\nNo fix is available for 12.1T releases. Upgrade to a supported version\n'; flag++;
}
# Affected: 12.2
if (check_release(version: version,
                  patched: make_list("12.2(12b)", "12.2(13a)"),
                  oldest: "12.2(1)")) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}
# Affected: 12.2S
if (check_release(version: version,
                  patched: make_list("12.2(14)S"),
                  oldest: "12.2(1)S")) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}
# Affected: 12.2T
if (check_release(version: version,
                  patched: make_list("12.2(11)T3", "12.2(13)T1") )) {
 report_extra = '\nUpdate to ' + patch_update + ' or later\n'; flag++;
}

if (get_kb_item("Host/local_checks_enabled"))
{

  if (flag)
  {
    flag = 0;
    buf = cisco_command_kb_item("Host/Cisco/Config/show_ip_ssh", "show ip ssh");
    if (check_cisco_result(buf))
    {
      if (preg(pattern:"SSH\s+Enabled", multiline:TRUE, string:buf)) { flag = 1; }
    } else if (cisco_needs_enable(buf)) { flag = 1; override = 1; }
  }
}



if (flag)
{
  security_hole(port:0, extra:report_extra + cisco_caveat(override));
  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/cisco-sa-20021219-ssh-packethttp.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\cisco-sa-20021219-ssh-packethttp.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/cisco-sa-20021219-ssh-packethttp.nasl

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How to Run

Here is how to run the SSH Malformed Packet Vulnerabilities - Cisco Systems 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 CISCO plugin family.
On the right side table select SSH Malformed Packet Vulnerabilities - Cisco Systems plugin ID 48968.
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 cisco-sa-20021219-ssh-packethttp.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a cisco-sa-20021219-ssh-packethttp.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - cisco-sa-20021219-ssh-packethttp.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 cisco-sa-20021219-ssh-packethttp.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

6405, 6407, 6408, 6410

Cisco Bug ID:

CSCdu75477, CSCdy87221, CSCdz07673, CSCdz60229, CSCdz62330, CSCdz66748, CSCeb16775, CSCed38362

Cisco Security Advisory:

cisco-sa-20021219-ssh-packet

CERT-CC | CERT Coordination Center:

CA-2002-36, 389665

CWE | Common Weakness Enumeration:

CWE-20 (Weakness) Improper Input Validation

See also:

Similar and related Nessus plugins:

11383 - Cisco SSH2 Server/Client Malformed Packet Remote DoS (CSCdz60229, CSCdy87221, CSCdu75477)
11195 - SSH Multiple Remote Vulnerabilities
118154 - SSH Protocol Authentication Bypass (Remote Exploit Check)
70658 - SSH Server CBC Mode Ciphers Enabled
10607 - SSH CRC-32 Compensation Attack Remote Overflow
86328 - SSH Diffie-Hellman Modulus <= 1024 Bits (Logjam)
73920 - SSH Static Key Accepted

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file cisco-sa-20021219-ssh-packethttp.nasl version 1.20. For more plugins, visit the Nessus Plugin Library.

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SSH Malformed Packet Vulnerabilities - Cisco Systems - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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