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Repudiation Attack

Revision as of 17:38, 4 July 2007 by Leocavallari (talk | contribs)

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


Repudiation is the act of refuse authoring of something that happened. A repudiation attack happens when an application or system do not adopt controls to properly track and log users actions, thus permitting malicious manipulation or forging the identification of an action. This attack can be used to change the authoring information of malicious actions that are stored on application log files and its usage can be extended to general data manipulation in name of others. If this attack takes place, the data stored on log files can be considered invalid or misleading.


Consider a web application that makes access control and authorization based on SessionId, but register user actions based on user parameter defined on Cookie header, as follows:

POST http://tequila/Upload_file.jsp HTTP/1.1
Host: tequila:8443
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv: Gecko/20070515 Firefox/
Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://tequila/uploads.jsp
Cookie: JSESSIONID=EE3BD1E764CD6EED280426128201131C; user=leonardo
Content-Type: multipart/form-data; boundary=---------------------------263152394310685
Content-Length: 321

And the log file is composed by:

Date, Time, Source IP, Source port, Request, User

Once user information is acquired from user parameter on header, a malicious user could make use of a local proxy (eg:paros) and change it by a known or unknown username.


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