OpenSSL DTLS Fragment Buffer Overflow DoS - Metasploit


This page contains detailed information about how to use the auxiliary/dos/ssl/dtls_fragment_overflow metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: OpenSSL DTLS Fragment Buffer Overflow DoS
Module: auxiliary/dos/ssl/dtls_fragment_overflow
Source code: modules/auxiliary/dos/ssl/dtls_fragment_overflow.rb
Disclosure date: 2014-06-05
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 4433
List of CVEs: CVE-2014-0195

This module performs a Denial of Service Attack against Datagram TLS in OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h. This occurs when a DTLS ClientHello message has multiple fragments and the fragment lengths of later fragments are larger than that of the first, a buffer overflow occurs, causing a DoS.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

msf > use auxiliary/dos/ssl/dtls_fragment_overflow
msf auxiliary(dtls_fragment_overflow) > show targets
    ... a list of targets ...
msf auxiliary(dtls_fragment_overflow) > set TARGET target-id
msf auxiliary(dtls_fragment_overflow) > show options
    ... show and set options ...
msf auxiliary(dtls_fragment_overflow) > exploit

Required Options

  • RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'

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Msfconsole Usage

Here is how the dos/ssl/dtls_fragment_overflow auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/ssl/dtls_fragment_overflow

msf6 auxiliary(dos/ssl/dtls_fragment_overflow) > show info

       Name: OpenSSL DTLS Fragment Buffer Overflow DoS
     Module: auxiliary/dos/ssl/dtls_fragment_overflow
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2014-06-05

Provided by:
  Juri Aedla <[email protected]>
  Jon Hart <[email protected]>

Check supported:
  No

Basic options:
  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  RHOSTS                    yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT    4433             yes       The target port (UDP)
  VERSION  65279            yes       SSl/TLS version

Description:
  This module performs a Denial of Service Attack against Datagram TLS 
  in OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 
  1.0.1h. This occurs when a DTLS ClientHello message has multiple 
  fragments and the fragment lengths of later fragments are larger 
  than that of the first, a buffer overflow occurs, causing a DoS.

References:
  https://nvd.nist.gov/vuln/detail/CVE-2014-0195
  http://www.zerodayinitiative.com/advisories/ZDI-14-173
  http://www.securityfocus.com/bid/67900
  http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/ZDI-14-173-CVE-2014-0195-OpenSSL-DTLS-Fragment-Out-of-Bounds/ba-p/6501002
  http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Once-Bled-Twice-Shy-OpenSSL-CVE-2014-0195/ba-p/6501048

Module Options

This is a complete list of options available in the dos/ssl/dtls_fragment_overflow auxiliary module:

msf6 auxiliary(dos/ssl/dtls_fragment_overflow) > show options

Module options (auxiliary/dos/ssl/dtls_fragment_overflow):

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   RHOSTS                    yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT    4433             yes       The target port (UDP)
   VERSION  65279            yes       SSl/TLS version

Advanced Options

Here is a complete list of advanced options supported by the dos/ssl/dtls_fragment_overflow auxiliary module:

msf6 auxiliary(dos/ssl/dtls_fragment_overflow) > show advanced

Module advanced options (auxiliary/dos/ssl/dtls_fragment_overflow):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   CHOST                       no        The local client address
   CPORT                       no        The local client port
   VERBOSE    false            no        Enable detailed status messages
   WORKSPACE                   no        Specify the workspace for this module

Auxiliary Actions

This is a list of all auxiliary actions that the dos/ssl/dtls_fragment_overflow module can do:

msf6 auxiliary(dos/ssl/dtls_fragment_overflow) > show actions

Auxiliary actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the dos/ssl/dtls_fragment_overflow auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(dos/ssl/dtls_fragment_overflow) > show evasion

Module evasion options:

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------

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References

See Also

Check also the following modules related to this module:

Authors

  • Juri Aedla <asd[at]ut.ee>
  • Jon Hart <jon_hart[at]rapid7.com>

Version

This page has been produced using Metasploit Framework version 6.2.29-dev. For more modules, visit the Metasploit Module Library.

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