Difference between revisions of "Parameter Delimiter"

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http://www.textzelrelba.com
 
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In order to illustrate this vulnerability, we will use a vulnerability found on Poster V2, a posting system based on PHP programming language.  
 
In order to illustrate this vulnerability, we will use a vulnerability found on Poster V2, a posting system based on PHP programming language.  
  
This application has a dangerous vulnerability that allows inserting data into user fields (username, password, email address and privileges) in “mem.php” file, which is responsible for managing the application user.
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This application has a dangerous vulnerability that allows inserting data into user fields (username, password, email address and privileges) in “mem.php” file, which is responsible for managing the application user.
  
An example of the file “mem.php”, where user Jose has admin privileges and Alice user access:
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An example of the file “mem.php”, where user Jose has admin privileges and Alice user access:
  
 
  <?
 
  <?
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  ?>
 
  ?>
  
When a user wants to edit his profile, he must use the "edit account” option in the “index.php” page and enter his login information. However, using |as a parameter delimiter on email field followed by “admin”, the user could elevate his privileges to administrator. Example:
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When a user wants to edit his profile, he must use the "edit account” option in the “index.php” page and enter his login information. However, using “|” as a parameter delimiter on email field followed by “admin”, the user could elevate his privileges to administrator. Example:
  
 
  Username: Alice
 
  Username: Alice
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  Email: alice@attack.com |admin|  
 
  Email: alice@attack.com |admin|  
  
This information will be recorded in “mem.php” file like this:  
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This information will be recorded in “mem.php” file like this:  
  
 
  Alice|87654321|alice@attack.com|admin|normal|
 
  Alice|87654321|alice@attack.com|admin|normal|
  
In this case, the last parameter delimiter considered is |admin|and the user could elevate his privileges by assigning administrator profile.
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In this case, the last parameter delimiter considered is “|admin|” and the user could elevate his privileges by assigning administrator profile.
  
Although this vulnerability doesn’t allow manipulation of other users' profiles, it allows privilege escalation for application users.
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Although this vulnerability doesn’t allow manipulation of other users' profiles, it allows privilege escalation for application users.
  
 
==Related [[Threat Agents]]==
 
==Related [[Threat Agents]]==

Revision as of 14:59, 22 May 2009

http://www.textzelrelba.com

This is an Attack. To view all attacks, please see the Attack Category page.




Last revision (mm/dd/yy): 05/22/2009

Description

This attack is based on the manipulation of parameter delimiters used by web application input vectors in order to cause unexpected behaviors like access control and authorization bypass and information disclosure, among others.

Risk Factors

TBD

Examples

In order to illustrate this vulnerability, we will use a vulnerability found on Poster V2, a posting system based on PHP programming language.

This application has a dangerous vulnerability that allows inserting data into user fields (username, password, email address and privileges) in “mem.php” file, which is responsible for managing the application user.

An example of the file “mem.php”, where user Jose has admin privileges and Alice user access:

<?
Jose|12345678|jose@attack.com|admin|
Alice|87654321|alice@attack.com|normal|
?>

When a user wants to edit his profile, he must use the "edit account” option in the “index.php” page and enter his login information. However, using “|” as a parameter delimiter on email field followed by “admin”, the user could elevate his privileges to administrator. Example:

Username: Alice
Password: 87654321
Email: alice@attack.com |admin| 

This information will be recorded in “mem.php” file like this:

Alice|87654321|alice@attack.com|admin|normal|

In this case, the last parameter delimiter considered is “|admin|” and the user could elevate his privileges by assigning administrator profile.

Although this vulnerability doesn’t allow manipulation of other users' profiles, it allows privilege escalation for application users.

Related Threat Agents

Related Attacks

Related Vulnerabilities

Related Controls

References