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Security researchers warn of LinkedIn exploit
July 24, 2007
Vulnerability Discovery and Analysis (VDA) Labs, founded in April by Jared DeMott, notifies software vendors of security bugs found in their software, as do many other security researchers.
But as part of VDA's business model, vendors are asked to pay for the bugs it discovers, or its consulting services, otherwise VDA threatens to sell the bug to a third party or make the details of the security flaw public.
DeMott, who has done work for the National Security Agency among other places, describes his business model as "edgy," while other security researchers see it as more akin to "extortion." The practice, in either case, veers from the more traditional ways bug hunters have worked with software vendors and security firms.
Just two weeks ago, LinkedIn, the popular social-networking site, got a taste of VDA's business practices, when the Michigan security company claimed it had found a critical security flaw in the LinkedIn Internet Explorer Toolbar.
"We've discovered an attack against the LinkedIn toolbar. If you are interested in the bug, we would like to give first right of refusal to purchase it. We'd also like to perform a more complete security audit of your products. We can help make the LinkedIn products more secure," DeMott stated in e-mail sent to LinkedIn on July 10, as viewed by CNET News.com.
The e-mail continues: "If you wouldn't like to buy it then we are happy to resell or release as a full disclosure to help prevent security issues arising on end users servers. We strongly believe in keeping users safe. We are unique in that we give vendors a first chance at the bugs we discover rather than selling to a third-party or releasing publicly. Please find the VDA Labs Value add document attached. If you'd like to buy the bug we will provide working attack code, so that you can verify the bug, before you send the check."
VDA set a deadline of July 17 and requested a payment of $5,000.
After failing to receive a response from LinkedIn, DeMott sent two e-mails on the eve of the deadline. One served as a reminder that the deadline was looming, and the other stated the price had increased to $10,000.
"Just developed the attack into a working exploit ($10K) now. Call me," DeMott wrote in the e-mail.
Two days after the deadline passed and details of the security flaw and how to exploit it were published, DeMott sent another e-mail to LinkedIn.
"So, if your company policy is to not buy bug reports, would you be willing to sign up for consulting (with VDA) then? We could include this bug as part of the final report. I really just had to irresponsibly release this exploit," DeMott said in the e-mail.
LinkedIn declined to comment. The company has since patched the exploit identified by VDA.
DeMott, who confirmed he sent the e-mails, defended his company's business practices and noted it's done to protect users by issuing them a heads-up, and by prompting vendors to take action to patch the flaw.
He also pointed to the VDA Value document, which outlines his company's services and pricing.
"Our business model is a little edgy, but we never saw it as extortion or thought of it that way," DeMott said. "We wanted to do something that would really grab the vendor. The vendors don't make money patching products. They're more interested in selling products. We were afraid they would try to put us on the back burner."
Some software companies, for example, do not work with security researchers as a matter of policy, and only act on vulnerabilities if flagged by their customers.
Other security researchers are critical of VDA's business model.
"Anytime you have someone saying they have this, and that unless you give them money, they'll do that, that's extortion," said Frederick Doyle, director of VeriSign/iDefense Research Lab and a former police officer in the state of New York.
Johannes Ullrich, chief research officer for the Sans Institute, expressed similar sentiments.
"I think this is extortion, particularly if he threatens to release the bug publicly if he's not paid," Ullrich said. "You should not hold a bug hostage."
VDA is not alone in its business practices, said Terri Forslof, manager of Security Response for Tipping Point, which is owned by 3Com.
Forslof, who previously worked as security program manager for the Microsoft Security Response Center, said she came across similar situations about a dozen times during her stint at the software giant between 2000 to 2005.




Although I agree that bug hunters who discover critical flaws in software and systems should be compensated for their work, the means in which VDA goes about it's business seems like something out of a bad Mafia type movie.
What is the difference?
The fact is, software companies will release half-baked products and shoddy products because they can. All teh economic incentive is built in releasing unfinished product. Someone has to put the incentive back in for them to fix and clean up their products BEFORE they're released.
That having been said, offering exploits for a fee seems like a perfectly legitimate transaction to propose. After all, the knowledge of the exploit has value, and the public benefits when there is an incentive to find them so they can be fixed. I'm just not impressed with the methods used in this case.
buy for $60 then pay $20 monthly or it will let viruses eat your comp
Or am I missing something in the JS code?
A good programmer at LinkedIn could find it, patch it, and test it in an hour. Unless that person is making $5000-$10000 per hour, I agree with LinkedIn's decision.
Forcing them to pay to gain access to the flaws which are inherient in their software.
Threatening to go public if they don't ransom up!
Sad news if you ask me... but the problem lies not so much in their tactics as it does in the fact that it doesn't currently pay very much to divulge security flaws to the manufacturer.
Thus I understand the concept of trying to make that a more profitable solution... but the tactics stink to high heaven.
Walt
I am surprised why LinkedIn did not sue VDA! They should! I bet VDA would run for their life if sued!
Sharing knowledge on bugs is not a bad thing. Too bad someone did not share knowlede about the bad state of repair (bugs) of the bridge that collapsed.
If you drive over the speed limit you get a ticket, makes sense to fine the sloppy software maker. Why should they get the feed back for free.
of extortion:
http://dictionary.law.com/definition2.asp?
selected=75&bold=|||| says:
blackmail
n. the crime of threatening to reveal embarrassing, disgraceful
or damaging facts (or rumors) about a person to the public,
family, spouse or associates unless paid off to not carry out the
threat. It is one form of extortion (which may include other
threats such as physical harm or damage to property).
See also: extortion
http://www.lectlaw.com/def/b105.htm says: BLACKMAIL - A
criminal act of extortion, malicious threatening to do injury to
another to compel him to do an act against his will. Usually
involves the threat to release information, often true, about the
person that will defame his reputation or bring criminal actions
against him.
The criminality lies not in the release of the information - at
least if true - but in the extortionate aspects of the threat to do
so.
In fact, this business model may also violate Federal RICO (anti-
racketeering) regulations.
I see no difference between VDA's actions and that of the Mafia.
Anyone presented with a threat by this company should contact
their local FBI field office: http://www.fbi.gov/contact/fo/fo.htm
Charles R. Whealton
Charles Whealton @ pleasedontspam.com