Re: Regular Expression Denial of Service
Alex Roichman wrote:
> 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 臓ug鐠in systems, but Alex Roichman and Adar Weidman
> from Checkmarx show how serious it is and how using this technique, various
> applications can be 壮eDoSed鐮 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
Alex, nice work. Thank you for sharing it with us.
I'd recommend taking a look at Ilja van Sprundel's work with regular
expression bugs in his Unusual bugs presentation.
.... Where he played a bit with Google Code Search back in 2007, I think.
He helped Google out by giving them his research, of course.
I found two versions online:
http://www.ruxcon.org.au/files/2006/unusual_bugs.pdf
http://www.slideshare.net/amiable_indian/unusual-bugs
Ilja and I later discussed creating a real regex fuzzer to discover
vulnerabilities, but I at least never had the time to play with it. He
might have, I am CC:ing him.
My best to Adar,
Gadi Evron,
http://www.gadievron.com/
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