BugTraq
Regular Expression Denial of Service Sep 10 2009 02:23PM
Alex Roichman (Alexr Checkmarx com) (3 replies)
Re: Regular Expression Denial of Service Sep 13 2009 07:35PM
Pavel Kankovsky (peak argo troja mff cuni cz)
Re: Regular Expression Denial of Service Sep 13 2009 06:32PM
Pavel Kankovsky (peak argo troja mff cuni cz)
Re: Regular Expression Denial of Service Sep 11 2009 04:21PM
Gadi Evron (ge linuxbox org) (1 replies)
Re[2]: Regular Expression Denial of Service Sep 11 2009 05:06PM
Thierry Zoller (Thierry zoller lu) (2 replies)
Hi ,

With all due respect - this is known to be a vulnerability class since
over a century. Just because it doesn't have a acronym à la XSS
doesn't mean it's not known to be a vulnerability. Can we please stop
the attitude of inventing acronyms for vulnerabilites, making it look
like it's something new and funky.

It's the impact of something that makes it a vulnerability no the
name.

GE> 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 ?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

GE> Alex, nice work. Thank you for sharing it with us.

GE> I'd recommend taking a look at Ilja van Sprundel's work with regular
GE> expression bugs in his Unusual bugs presentation.
GE> ... Where he played a bit with Google Code Search back in 2007, I think.
GE> He helped Google out by giving them his research, of course.

GE> I found two versions online:
GE> http://www.ruxcon.org.au/files/2006/unusual_bugs.pdf
GE> http://www.slideshare.net/amiable_indian/unusual-bugs

GE> Ilja and I later discussed creating a real regex fuzzer to discover
GE> vulnerabilities, but I at least never had the time to play with it. He
GE> might have, I am CC:ing him.

GE> My best to Adar,

GE> Gadi Evron,
GE> http://www.gadievron.com/

--
http://blog.zoller.lu
Thierry Zoller

[ reply ]
Re: Re[2]: Regular Expression Denial of Service Sep 11 2009 09:35PM
Jeffrey Walton (noloader gmail com)
Re: Regular Expression Denial of Service Sep 11 2009 09:10PM
Gadi Evron (ge linuxbox org)


 

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