SecureCRT SSH-1 Protocol Version String Remote Overflow - Nessus

High Plugin ID: 15822

This page contains detailed information about the SecureCRT SSH-1 Protocol Version String Remote Overflow 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: 15822
Name: SecureCRT SSH-1 Protocol Version String Remote Overflow
Filename: securecrt_remote_overflow.nasl
Vulnerability Published: 2002-07-23
This Plugin Published: 2004-11-24
Last Modification Time: 2018-07-27
Plugin Version: 1.18
Plugin Type: local
Plugin Family: Windows
Dependencies: smb_hotfixes.nasl
Required KB Items [?]: SMB/Registry/Enumerated

Vulnerability Information

Severity: High
Vulnerability Published: 2002-07-23
Patch Published: N/A
CVE [?]: CVE-2002-1059
CPE [?]: N/A

Synopsis

The remote host has an application that is affected by a buffer overflow vulnerability.

Description

The remote host is using a vulnerable version of SecureCRT, a SSH/Telnet client built for Microsoft Windows operating systems.

It has been reported that SecureCRT contains a remote buffer overflow allowing an SSH server to execute arbitrary commands via an especially long SSH1 protocol version string.

Solution

Upgrade to SecureCRT 3.2.2, 3.3.4, 3.4.6, 4.1 or newer

Public Exploits

Target Network Port(s): 139, 445
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the SecureCRT SSH-1 Protocol Version String Remote Overflow vulnerability:

Metasploit: exploit/windows/ssh/securecrt_ssh1
[SecureCRT SSH1 Buffer Overflow]
Exploit-DB: exploits/windows/remote/16460.rb
[EDB-16460: SecureCRT 4.0 Beta 2 SSH1 - Remote Buffer Overflow (Metasploit)]

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:M/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	9.3 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.6
CVSS Temporal Score:	7.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.7 (High)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
 script_id(15822);
 script_version("1.18");
 script_cvs_date("Date: 2018/07/27 18:38:15");

 script_cve_id("CVE-2002-1059");
 script_bugtraq_id(5287);

 script_name(english:"SecureCRT SSH-1 Protocol Version String Remote Overflow");
 script_summary(english:"Determines the version of SecureCRT");

 script_set_attribute(attribute:"synopsis", value:
"The remote host has an application that is affected by a buffer
overflow vulnerability.");
 script_set_attribute(attribute:"description", value:
"The remote host is using a vulnerable version of SecureCRT, a
SSH/Telnet client built for Microsoft Windows operating systems.

It has been reported that SecureCRT contains a remote buffer overflow
allowing an SSH server to execute arbitrary commands via an especially
long SSH1 protocol version string.");
 script_set_attribute(attribute:"solution", value:"Upgrade to SecureCRT 3.2.2, 3.3.4, 3.4.6, 4.1 or newer");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:'SecureCRT SSH1 Buffer Overflow');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

 script_set_attribute(attribute:"vuln_publication_date", value:"2002/07/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2004/11/24");

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

 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 2004-2018 Tenable Network Security, Inc.");
 script_family(english:"Windows");
 script_dependencies("smb_hotfixes.nasl");
 script_require_keys("SMB/Registry/Enumerated");
 script_require_ports(139, 445);
 exit(0);
}

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

# Connect to the appropriate share.
name    =  kb_smb_name();
port    =  kb_smb_transport();

login   =  kb_smb_login();
pass    =  kb_smb_password();
domain  =  kb_smb_domain();



if(! smb_session_init()) audit(AUDIT_FN_FAIL, 'smb_session_init');
rc = NetUseAdd(login:login, password:pass, domain:domain, share:"IPC$");
if (rc != 1) {
  NetUseDel();
  exit(0);
}

# Connect to remote registry.
hklm = RegConnectRegistry(hkey:HKEY_LOCAL_MACHINE);
if (isnull(hklm))
{
  NetUseDel();
  exit(0);
}

key = "SOFTWARE\VanDyke\SecureCRT\License";
key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
if ( isnull(key_h) )
{
 key = "SOFTWARE/VanDyke/SecureCRT/Evaluation License/Version";
 if ( isnull(key_h) )
 {
  RegCloseKey(handle:hklm);
  NetUseDel();
  exit(0);
 }
}

version = RegQueryValue(handle:key_h, item:"Version");
RegCloseKey(handle:key_h);
RegCloseKey(handle:hklm);
NetUseDel();
if ( !isnull(version) )
{
 set_kb_item(name:"SMB/SecureCRT/Version", value:version[1]);
 if (egrep(pattern:"^(2\.|3\.([01]|2[^.]|2\.1[^0-9]|3[^.]|3\.[1-3][^0-9]|4[^.]|4\.[1-5][^0-9])|4\.0 beta [12]([^0-9]|$))", string:version[1]))
  security_hole(kb_smb_transport());
}

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

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

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How to Run

Here is how to run the SecureCRT SSH-1 Protocol Version String Remote Overflow 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 Windows plugin family.
On the right side table select SecureCRT SSH-1 Protocol Version String Remote Overflow plugin ID 15822.
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 securecrt_remote_overflow.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID:

5287

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 securecrt_remote_overflow.nasl version 1.18. For more plugins, visit the Nessus Plugin Library.

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SecureCRT SSH-1 Protocol Version String Remote Overflow - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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