Symantec pcAnywhere Service Unrestricted Access - Nessus

Critical Plugin ID: 10798

This page contains detailed information about the Symantec pcAnywhere Service Unrestricted Access 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: 10798
Name: Symantec pcAnywhere Service Unrestricted Access
Filename: DDI_Unprotected_PCanywhere.nasl
Vulnerability Published: N/A
This Plugin Published: 2001-11-07
Last Modification Time: 2012-08-15
Plugin Version: 1.27
Plugin Type: remote
Plugin Family: Windows
Dependencies: find_service1.nasl, PC_anywhere_tcp.nasl

Vulnerability Information

Severity: Critical
Vulnerability Published: N/A
Patch Published: N/A
CVE [?]: CVE-1999-0508
CPE [?]: N/A

Synopsis

The remote access service on this port allows unrestricted access.

Description

The pcAnywhere service does not require a password to access the desktop of this system. If this machine is running Windows 95, 98, or ME, gaining full control of the machine is trivial. If this system is running NT or 2000 and is currently logged out, an attacker can still spy on and hijack a legitimate user's session when they login.

Solution

1. Open the PC Anywhere application as an Administrator. 2. Right click on the Host object you are using and select Properties. 3. Select the Caller Access tab. 4. Switch the authentication type to Windows or PC Anywhere. 5. If you are using PC Anywhere authentication, set a strong password.

Public Exploits

Target Network Port(s): 5631
Target Asset(s): Services/pcanywheredata
Exploit Available: True (Metasploit Framework)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Symantec pcAnywhere Service Unrestricted Access vulnerability:

Metasploit: auxiliary/scanner/snmp/snmp_login
[SNMP Community Scanner]
Metasploit: auxiliary/scanner/snmp/snmp_login
[SNMP Community Login Scanner]

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 V2 Vector [?]: AV:N/AC:L/Au:N/C:C/I:C/A:C

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

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Plugin Source

#
# This script was written by H D Moore
#

# Changes by Tenable:
# - Revised plugin title, changed family (1/22/09)
# - Revised plugin title, output formatting, family change (9/08/09)
# - Revised plugin title (1/29/11)

include("compat.inc");

if(description)
{
 script_id(10798);
 script_version ("$Revision: 1.27 $");
 script_cvs_date("$Date: 2012/08/15 21:05:11 $");

 script_cve_id("CVE-1999-0508");

 script_name(english:"Symantec pcAnywhere Service Unrestricted Access");
 script_summary(english:"Unprotected PC Anywhere Service");

 script_set_attribute(attribute:"synopsis", value:
"The remote access service on this port allows unrestricted access.");
 script_set_attribute(attribute:"description", value:
"The pcAnywhere service does not require a password to access the
desktop of this system.  If this machine is running Windows 95, 98, or
ME, gaining full control of the machine is trivial.  If this system is
running NT or 2000 and is currently logged out, an attacker can still
spy on and hijack a legitimate user's session when they login.");
 script_set_attribute(attribute:"solution", value:
"1. Open the PC Anywhere application as an Administrator. 
2. Right click on the Host object you are using and select Properties.
3. Select the Caller Access tab. 
4. Switch the authentication type to Windows or PC Anywhere.
5. If you are using PC Anywhere authentication, set a strong password.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A: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:'SNMP Community Scanner');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
 script_set_attribute(attribute:"plugin_publication_date", value:
"2001/11/07");
 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_end_attributes();

 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 2002-2012 Digital Defense Incorporated");
 script_family(english:"Windows");
 script_dependencies("find_service1.nasl", "PC_anywhere_tcp.nasl");
 script_require_ports("Services/pcanywheredata", 5631);
 exit(0);
}

#
# The script code starts here
#

debug = 0;

cl[0] = raw_string (0x00, 0x00, 0x00, 0x00);
sv[0] = "nter";

cl[1] = raw_string (0x6f, 0x06, 0xff);
sv[1] = raw_string (0x1b, 0x61);

cl[2] = raw_string (0x6f, 0x61, 0x00, 0x09, 0x00, 0xfe, 0x00,
                    0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00);
                            
sv[2] = raw_string (0x1b, 0x62);

cl[3] = raw_string (0x6f, 0x62, 0x01, 0x02, 0x00, 0x00, 0x00);         
sv[3] = raw_string (0x65, 0x6e);

cl[4] = raw_string(0x6f, 0x49, 0x00, 0x4c, 0x20, 0x20, 0x20, 0x20,
                   0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00,
                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                   0x00, 0x00, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00,
                   0x00, 0x00, 0x09, 0xff, 0x05, 0x00, 0x00, 0x00,
                   0x60, 0x24, 0x00, 0x09, 0x00, 0x00, 0x00, 0x06,
                   0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
                   0x41, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                   0x31);
sv[4] = raw_string(0x1b, 0x16);

cl[5] = raw_string(0x6f, 0x73, 0x02, 0x01, 0x00, 0x02);
sv[5] = "Service Pack";

port = get_kb_item("Services/pcanywheredata");
if(!port)port = 5631;

if(get_port_state(port))
{
    soc = open_sock_tcp(port);
    if(soc)
    {

        for(d=0;cl[d];d=d+1)
        {
            if(debug)display(":: entering level ", d, "\n");
            send(socket:soc, data:cl[d]);
            r  = recv(socket:soc, length:2048);
	    if(!r)exit(0);
            
            # no minimum encryption level set
            if(d == 2)
            {
                if(("Reducing" >< r) && ("encryption" >< r))
                {
                    if(debug)display("Warning: no minimum encryption level set.\n");
                }
                if(("denying" >< r) && ("cannot connect at level" >< r))
                {
                   if(debug)display("Warning: plugin exiting because a minimum encryption level has been set.\n");
                   exit(0);                   
                }
            }
            
            # user authentication
            if(d == 3)
            {
                if(("Enter user name" >< r) || ("Enter login name" >< r))
                {
                    if(debug)display("Warning: plugin exiting because user authentication needed.\n");
                    exit(0); 
                }
            }
                       
            if( sv[d] >!< r)
            {
            
                close(soc);
                if(debug)display("exiting at level ", d, "\n");
                exit(0);
            }
        }
        security_hole(port:port);
	close(soc);
    }
}

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

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

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How to Run

Here is how to run the Symantec pcAnywhere Service Unrestricted Access 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 Symantec pcAnywhere Service Unrestricted Access plugin ID 10798.
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 DDI_Unprotected_PCanywhere.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

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 DDI_Unprotected_PCanywhere.nasl version $Revision: 1.27 $. For more plugins, visit the Nessus Plugin Library.

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Symantec pcAnywhere Service Unrestricted Access - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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