module
Hashtable Collisions
| Disclosed | Created |
|---|---|
| 12/28/2011 | 05/30/2018 |
Disclosed
12/28/2011
Created
05/30/2018
Description
This module uses a denial-of-service (DoS) condition appearing in a variety of
programming languages. This vulnerability occurs when storing multiple values
in a hash table and all values have the same hash value. This can cause a web server
parsing the POST parameters issued with a request into a hash table to consume
hours of CPU with a single HTTP request.
Currently, only the hash functions for PHP and Java are implemented.
This module was tested with PHP + httpd, Tomcat, Glassfish and Geronimo.
It also generates a random payload to bypass some IDS signatures.
programming languages. This vulnerability occurs when storing multiple values
in a hash table and all values have the same hash value. This can cause a web server
parsing the POST parameters issued with a request into a hash table to consume
hours of CPU with a single HTTP request.
Currently, only the hash functions for PHP and Java are implemented.
This module was tested with PHP + httpd, Tomcat, Glassfish and Geronimo.
It also generates a random payload to bypass some IDS signatures.
Authors
Alexander KlinkJulian WaeldeScott A. CrosbyDan S. WallachKrzysztof KotowiczChristian Mehlmauer
References
Module Options
To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:
msf > use auxiliary/dos/http/hashcollision_dos
msf /(s) > show actions
...actions...
msf /(s) > set ACTION < action-name >
msf /(s) > show options
...show and set options...
msf /(s) > run
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