Regular Expression Denial of Service

2009.09.23
Credit: Alex Roichman
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-134

Checkmarx Research Lab presents a new attack vector on Web applications. By exploiting the Regular Expression Denial of Service (ReDoS) vulnerability an attacker can make a Web application unavailable to its intended users. ReDoS is commonly known as a ?bug? in systems, but Alex Roichman and Adar Weidman from Checkmarx show how serious it is and how using this technique, various applications can be ?ReDoSed?. These include, among others, Server-side of Web applications and Client-side Browsers. The art of attacking the Web by ReDoS is by finding inputs which cannot be matched by Regexes and on these Regexes a Regex-based Web systems get stuck. For further reading: http://www.checkmarx.com/NewsDetails.aspx?id=23&cat=3 AlexRoichman Chief Architect, Checkmarx Ltd. Mobile: +972 547745198 Fax: +972-3-6870794 Website: www.Checkmarx.com

Referencje:

http://www.securityfocus.com/archive/1/archive/1/506419/100/0/threaded
http://www.checkmarx.com/Upload/Documents/PDF/Checkmarx_OWASP_IL_2009_ReDoS.pdf


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