GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code - Nessus

Critical Plugin ID: 23762

This page contains detailed information about the GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code 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: 23762
Name: GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code
Filename: gentoo_GLSA-200611-26.nasl
Vulnerability Published: 2006-10-05
This Plugin Published: 2006-12-04
Last Modification Time: 2021-01-06
Plugin Version: 1.15
Plugin Type: local
Plugin Family: Gentoo Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Gentoo/qpkg-list, Host/Gentoo/release, Host/local_checks_enabled

Vulnerability Information

Severity: Critical
Vulnerability Published: 2006-10-05
Patch Published: 2006-11-30
CVE [?]: CVE-2006-5815, CVE-2006-6170, CVE-2006-6171
CPE [?]: cpe:/o:gentoo:linux, p-cpe:/a:gentoo:linux:proftpd

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-200611-26 (ProFTPD: Remote execution of arbitrary code)

Evgeny Legerov discovered a stack-based buffer overflow in the s_replace() function in support.c, as well as a buffer overflow in in the mod_tls module. Additionally, an off-by-two error related to the CommandBufferSize configuration directive was reported. Impact :

An authenticated attacker could exploit the s_replace() vulnerability by uploading a crafted .message file or sending specially crafted commands to the server, possibly resulting in the execution of arbitrary code with the rights of the user running ProFTPD. An unauthenticated attacker could send specially crafted data to the server with mod_tls enabled which could result in the execution of arbitrary code with the rights of the user running ProFTPD. Finally, the off-by-two error related to the CommandBufferSize configuration directive was fixed - exploitability of this error is disputed. Note that the default configuration on Gentoo is to run ProFTPD as an unprivileged user, and has mod_tls disabled. Workaround :

There is no known workaround at this time.

Solution

All ProFTPD users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose '>=net-ftp/proftpd-1.3.0a'

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code vulnerability:

Metasploit: exploit/linux/ftp/proftp_sreplace
[ProFTPD 1.2 - 1.3.0 sreplace Buffer Overflow (Linux)]
Exploit-DB: exploits/linux/remote/16852.rb
[EDB-16852: ProFTPd 1.2 < 1.3.0 (Linux) - 'sreplace' Remote Buffer Overflow (Metasploit)]
GitHub: https://github.com/mudongliang/LinuxFlaw/tree/master/CVE-2006-5815
[CVE-2006-5815]

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

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

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200611-26.
#
# The advisory text is Copyright (C) 2001-2015 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

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

if (description)
{
  script_id(23762);
  script_version("1.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id("CVE-2006-5815", "CVE-2006-6170", "CVE-2006-6171");
  script_xref(name:"GLSA", value:"200611-26");

  script_name(english:"GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-200611-26
(ProFTPD: Remote execution of arbitrary code)

    Evgeny Legerov discovered a stack-based buffer overflow in the
    s_replace() function in support.c, as well as a buffer overflow in in
    the mod_tls module. Additionally, an off-by-two error related to the
    CommandBufferSize configuration directive was reported.
  
Impact :

    An authenticated attacker could exploit the s_replace() vulnerability
    by uploading a crafted .message file or sending specially crafted
    commands to the server, possibly resulting in the execution of
    arbitrary code with the rights of the user running ProFTPD. An
    unauthenticated attacker could send specially crafted data to the
    server with mod_tls enabled which could result in the execution of
    arbitrary code with the rights of the user running ProFTPD. Finally,
    the off-by-two error related to the CommandBufferSize configuration
    directive was fixed - exploitability of this error is disputed. Note
    that the default configuration on Gentoo is to run ProFTPD as an
    unprivileged user, and has mod_tls disabled.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200611-26"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All ProFTPD users should upgrade to the latest version:
    # emerge --sync
    # emerge --ask --oneshot --verbose '>=net-ftp/proftpd-1.3.0a'"
  );
  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:'ProFTPD 1.2 - 1.3.0 sreplace Buffer Overflow (Linux)');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_cwe_id(119);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:proftpd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2006/11/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/12/04");
  script_set_attribute(attribute:"vuln_publication_date", value:"2006/10/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2006-2021 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"net-ftp/proftpd", unaffected:make_list("ge 1.3.0a"), vulnerable:make_list("lt 1.3.0a"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ProFTPD");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/gentoo_GLSA-200611-26.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\gentoo_GLSA-200611-26.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/gentoo_GLSA-200611-26.nasl

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How to Run

Here is how to run the GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code 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 Gentoo Local Security Checks plugin family.
On the right side table select GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code plugin ID 23762.
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 gentoo_GLSA-200611-26.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a gentoo_GLSA-200611-26.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - gentoo_GLSA-200611-26.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 gentoo_GLSA-200611-26.nasl -t <IP/HOST>

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References

GLSA | Gentoo Linux Security Advisory:

200611-26

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:

23757 - Debian DSA-1222-2 : proftpd - several vulnerabilities
23952 - FreeBSD : proftpd -- remote code execution vulnerabilities (3f851b22-89fb-11db-a937-003048116330)
24602 - Mandrake Linux Security Advisory : proftpd (MDKSA-2006:217-1)
27055 - ProFTPD < 1.3.0a Multiple Vulnerabilities
24660 - Slackware 10.0 / 10.1 / 10.2 / 11.0 / 8.1 / 9.0 / 9.1 : proftpd (SSA:2006-335-02)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file gentoo_GLSA-200611-26.nasl version 1.15. For more plugins, visit the Nessus Plugin Library.

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GLSA-200611-26 : ProFTPD: Remote execution of arbitrary code - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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