Serv-U < 9.1.0.0 - Nessus

High   Plugin ID: 42934

This page contains detailed information about the Serv-U < 9.1.0.0 Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents
hide

Plugin Overview

ID: 42934
Name: Serv-U < 9.1.0.0
Filename: servu_9_1_0_0.nasl
Vulnerability Published: 2009-11-17
This Plugin Published: 2009-11-30
Last Modification Time: 2022-04-11
Plugin Version: 1.16
Plugin Type: remote
Plugin Family: FTP
Dependencies: servu_version.nasl
Required KB Items [?]: ftp/servu

Vulnerability Information

Severity: High
Vulnerability Published: 2009-11-17
Patch Published: 2009-11-17
CVE [?]: CVE-2009-4006, CVE-2009-4873
CPE [?]: cpe:/a:serv-u:serv-u

Synopsis

The remote FTP server is affected by multiple vulnerabilities.

Description

According to its banner, the installed version of Serv-U is earlier than 9.1.0.0, and therefore affected by the following issues :

- A boundary error in the web administration interface when parsing session cookies can result in a stack-based buffer overflow. (CVE-2009-4873)

- A boundary error in the TEA decoding algorithm can result in a stack-based buffer overflow when processing a long hexadecimal string. (CVE-2009-4006)

Solution

Upgrade to Serv-U version 9.1.0.0 or later.

Public Exploits

Target Network Port(s): 21
Target Asset(s): Services/ftp
Exploit Available: True (Metasploit Framework, Exploit-DB, Core Impact)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Serv-U < 9.1.0.0 vulnerability:

  1. Metasploit: exploit/windows/http/servu_session_cookie
    [Rhinosoft Serv-U Session Cookie Buffer Overflow]
  2. Exploit-DB: exploits/windows/remote/16775.rb
    [EDB-16775: RhinoSoft Serv-U FTP Server - Session Cookie 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:L/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C
CVSS Base Score:9.0 (High)
Impact Subscore:10.0
Exploitability Subscore:8.0
CVSS Temporal Score:7.4 (High)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:7.4 (High)

Go back to menu.

Plugin Source

This is the servu_9_1_0_0.nasl nessus plugin source code. This script is Copyright (C) 2009-2022 Tenable Network Security, Inc. 

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(42934);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2009-4006", "CVE-2009-4873");
  script_bugtraq_id(36895, 37051);
  script_xref(name:"SECUNIA", value:"37228");

  script_name(english:"Serv-U < 9.1.0.0");

  script_set_attribute(attribute:"synopsis", value:
"The remote FTP server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"According to its banner, the installed version of Serv-U is earlier
than 9.1.0.0, and therefore affected by the following issues :

  - A boundary error in the web administration interface
    when parsing session cookies can result in a stack-based
    buffer overflow. (CVE-2009-4873)

  - A boundary error in the TEA decoding algorithm can
    result in a stack-based buffer overflow when processing
    a long hexadecimal string. (CVE-2009-4006)");
  script_set_attribute(attribute:"see_also", value:"http://www.rangos.de/ServU-ADV.txt");
  script_set_attribute(attribute:"see_also", value:"https://secuniaresearch.flexerasoftware.com/secunia_research/2009-46/");
  script_set_attribute(attribute:"see_also", value:"https://support.solarwinds.com/Success_Center/Serv-U_Managed_File_Transfer_Serv-U_FTP_Server/Serv-U_Documentation/release_notes");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Serv-U version 9.1.0.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Rhinosoft Serv-U Session Cookie Buffer Overflow');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_cwe_id(119);

  script_set_attribute(attribute:"vuln_publication_date", value:"2009/11/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2009/11/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/11/30");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:serv-u:serv-u");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"FTP");

  script_copyright(english:"This script is Copyright (C) 2009-2022 Tenable Network Security, Inc.");

  script_dependencies("servu_version.nasl");
  script_require_keys("ftp/servu");
  script_require_ports("Services/ftp", 21);

  exit(0);
}


include("global_settings.inc");
include("misc_func.inc");
include("ftp_func.inc");


port    = get_ftp_port(default:21);
version = get_kb_item_or_exit('ftp/'+port+'/servu/version');
source  = get_kb_item_or_exit('ftp/'+port+'/servu/source');

if (
  version =~ "^[6-9]\." &&
  ver_compare(ver: version , fix: '9.1', strict: FALSE) == -1
)
{
  if (report_verbosity > 0)
  {
    report = 
      '\n  Version source    : ' + source +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : 9.1.0.0' +
      '\n';
    security_hole(port: port, extra: report);
  }
  else security_hole(port);
}
else exit(0, "The Serv-U version "+version+" install listening on port "+port+" is 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/servu_9_1_0_0.nasl
  • Windows:
    C:\ProgramData\Tenable\Nessus\nessus\plugins\servu_9_1_0_0.nasl
  • Mac OS X:
    /Library/Nessus/run/lib/nessus/plugins/servu_9_1_0_0.nasl

Go back to menu.

How to Run

Here is how to run the Serv-U < 9.1.0.0 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 FTP plugin family.
  6. On the right side table select Serv-U < 9.1.0.0 plugin ID 42934.
  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 servu_9_1_0_0.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a servu_9_1_0_0.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - servu_9_1_0_0.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 servu_9_1_0_0.nasl -t <IP/HOST>

Go back to menu.

References

BID | SecurityFocus Bugtraq ID: Secunia Advisory: CWE | Common Weakness Enumeration:
  • CWE-119 (Weakness) Improper Restriction of Operations within the Bounds of a Memory Buffer
See also: Similar and related Nessus plugins:
  • 146308 - Serv-U FTP Server < 15.2.2 Hotfix 1 Arbitrary File Read/Write
  • 151646 - Serv-U FTP Server <= 15.2.3 Hotfix 1 Memory Escape Vulnerability
  • 34398 - Serv-U 7.x < 7.3.0.1 Multiple Remote Vulnerabilities (DoS, Traversal)
  • 36035 - Serv-U < 8.0.0.1 Multiple Vulnerabilities (DoS, Traversal)
  • 12080 - Serv-U MDTM Command Overflow
  • 12037 - Serv-U SITE CHMOD Command Multiple Vulnerabilities
  • 32032 - Red Hat Administration Server (redhat-ds-admin) Multiple Remote Vulnerabilities
  • 25424 - SNMPc Management Server Login Packet Remote DoS
  • 77704 - Usermin 'miniserv.pl' Arbitrary File Disclosure
  • 108549 - Webmin < 1.250 miniserv.pl Remote Code Execution
  • 21785 - Webmin 'miniserv.pl' Arbitrary File Disclosure
  • 20343 - Webmin 'miniserv.pl' 'username' Parameter Format String

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file servu_9_1_0_0.nasl version 1.16. For more plugins, visit the Nessus Plugin Library.

Go back to menu.