Multiple Linux rpc.mountd Remote Overflow - Nessus

Critical   Plugin ID: 11337

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This page contains detailed information about the Multiple Linux rpc.mountd Remote Overflow Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Plugin Overview

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ID: 11337
Name: Multiple Linux rpc.mountd Remote Overflow
Filename: mountd_overflow.nasl
Vulnerability Published: 1998-10-12
This Plugin Published: 2003-03-12
Last Modification Time: 2018-07-16
Plugin Version: 1.18
Plugin Type: remote
Plugin Family: Gain a shell remotely
Dependencies: rpc_portmap.nasl
Required KB Items [?]: rpc/portmap

Vulnerability Information

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Severity: Critical
Vulnerability Published: 1998-10-12
Patch Published: N/A
CVE [?]: CVE-1999-0002
CPE [?]: N/A

Synopsis

The remote service has a buffer overflow vulnerability.

Description

The remote mount daemon seems to have a buffer overflow vulnerability. A remote attacker could exploit this to execute arbitrary code as root.

Solution

Consult your vendor for patch or upgrade information.

Public Exploits

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Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Multiple Linux rpc.mountd Remote Overflow vulnerability:

1. GitHub: https://github.com/jimmyislive/gocve
   [CVE-1999-0002]
2. GitHub: https://github.com/quentinmayo/get_nvd_data_from_online_to_csv
   [CVE-1999-0002]

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

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CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:OF/RC:C

CVSS Base Score:	10.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	10.0
CVSS Temporal Score:	7.8 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.8 (High)

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Plugin Source

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This is the mountd_overflow.nasl nessus plugin source code. This script is Copyright (C) 2003-2018 Tenable Network Security, Inc.

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


include("compat.inc");


if (description)
{
 script_id(11337);
 script_version("1.18");
 script_cvs_date("Date: 2018/07/16 14:09:13");
 script_cve_id("CVE-1999-0002");
 script_bugtraq_id(121);
 script_xref(name:"CERT-CC", value:"CA-1998-12");

 script_name(english:"Multiple Linux rpc.mountd Remote Overflow");
 script_summary(english:"Overflows mountd");

 script_set_attribute(
   attribute:"synopsis",
   value:"The remote service has a buffer overflow vulnerability."
 );
 script_set_attribute(attribute:"description",  value:
"The remote mount daemon seems to have a buffer overflow
vulnerability.  A remote attacker could exploit this to
execute arbitrary code as root." );
 script_set_attribute(
   attribute:"solution",
   value:"Consult your vendor for patch or upgrade information."
 );
 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:POC/RL:OF/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"true");
 script_cwe_id(119);

 script_set_attribute(attribute:"vuln_publication_date", value:"1998/10/12");
 script_set_attribute(attribute:"plugin_publication_date", value:"2003/03/12");

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

 script_category(ACT_DESTRUCTIVE_ATTACK);
 script_family(english:"Gain a shell remotely");

 script_copyright(english:"This script is Copyright (C) 2003-2018 Tenable Network Security, Inc.");

 script_dependencie("rpc_portmap.nasl");
 script_require_keys("rpc/portmap");
 exit(0);
}



include("misc_func.inc");
include("nfs_func.inc");
include("sunrpc_func.inc");


function naughty_mount(soc, share)
{
  local_var pad, req, len, r, ret, i;

  pad = padsz(len:strlen(this_host_name()));
  len = 52 + strlen(this_host_name()) + pad;

  req = 	   rpclong(val:rand()) +
  		   rpclong(val:0) +
		   rpclong(val:2) +
		   rpclong(val:100005) +
		   rpclong(val:1) +
		   rpclong(val:1) +
		   rpclong(val:1) +
		   rpclong(val:len) +
		   rpclong(val:rand()) +
		   rpclong(val:strlen(this_host_name())) +
		   this_host_name() +
		   rpcpad(pad:pad) +
		   rpclong(val:0)  +
		   rpclong(val:0)  +
		   rpclong(val:7)  +
		   rpclong(val:0)  +
		   rpclong(val:2)  +
		   rpclong(val:3)  +
		   rpclong(val:4)  +
		   rpclong(val:5)  +
		   rpclong(val:20) +
		   rpclong(val:31) +
		   rpclong(val:0)  +
		   rpclong(val:0)  +
		   rpclong(val:0)  +

		   rpclong(val:strlen(share)) +
		   share +
		   rpcpad(pad:padsz(len:strlen(share)));

  send(socket:soc, data:req);
  r = recv(socket:soc, length:4096);
  if(!r) return 0;
  else return 1;
}

port = get_rpc_port2(program:100005, protocol:IPPROTO_UDP);
if ( ! port ) exit(0);
if (! get_udp_port_state(port)) exit(0, "UDP port "+port+" is not open.");

soc = open_priv_sock_udp(dport:port);
if(!soc)exit(0);

if(naughty_mount(soc:soc, share:"/nessus") != 0)
{
 naughty_mount(soc:soc, share:"/" + crap(4096));
 sleep(1);
 if(naughty_mount(soc:soc, share:"/nessus") == 0)
  security_hole(port:port, proto:"udp");
}

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

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

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How to Run

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Here is how to run the Multiple Linux rpc.mountd Remote Overflow as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

1. Click to start a New Scan.
2. Select Advanced Scan.
3. Navigate to the Plugins tab.
4. On the top right corner click to Disable All plugins.
5. On the left side table select Gain a shell remotely plugin family.
6. On the right side table select Multiple Linux rpc.mountd Remote Overflow plugin ID 11337.
7. Specify the target on the Settings tab and click to Save the scan.
8. 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 mountd_overflow.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

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BID | SecurityFocus Bugtraq ID:

• 121

CERT-CC | CERT Coordination Center:

• CA-1998-12

CWE | Common Weakness Enumeration:

• CWE-119 (Weakness) Improper Restriction of Operations within the Bounds of a Memory Buffer

See also:

• https://www.tenable.com/plugins/nessus/11337
• https://vulners.com/nessus/MOUNTD_OVERFLOW.NASL

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Version

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This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file mountd_overflow.nasl version 1.18. For more plugins, visit the Nessus Plugin Library.

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