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Action collective créée le 11/06/17 | 2 adhérant(s) (Adhérer)


Hauts-de-Seine, Le 09/01/2018 à 07:30
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Imagine you host an online forum: people write comments and they're published on the site. But what if the comment has a chunk of JavaScript secreted in it alongside the innocent-looking message:The innocent user's browser will execute the script – and bearing mind that JavaScript can do all kinds of powerful funky stuff the chances are that this will involve connecting to the intruder's server and sending sensitive data that could be used against the genuine user.You've probably spotted that this type of attack is similar to the SQL injection we looked at earlier: so to protect yourself you simply need to ensure that you're escaping any user input so that it doesn't just blindly get whacked into the system and treated as valid code.You wouldn't present a web page that includes back-end information in the query, would you? For example if a user logs in and his internal account ID is 1029345:You do? Hmm, I wouldn't. But if you insist, presumably you do some validation so the user can't just change the account number and see someone else's details:You'd be surprised that this type of daftness exists, but it does. How to avoid it? Use unique, randomised session IDs, never include internal identifiable Ids (account numbers, seqential identifiers, etc) in browser exchanges like this, and verify access permissions with every single page request.
This one covers a vast range of possible system issues, and in the OWASP context it's not actually restricted to configuration in its literal sense because the category also includes problems with out-of-date software (which may have security bugs that are fixed in later releases). The three genuinely configuration-related issues I've seen most over the years are:Leaving diagnostic messages enabled on the server. For instance in an out-of-the box PHP installation you can generally point the browser at http://www.mysite.com/phpinfo.php – which dishes up all the gory information about your server, OS version, database version, PHP version … everything an intruder needs in order to look up your vulnerabilities via Google.

Excessive permissions on back-end systems – usually databases. As with the SQL injection example earlier, the connection from your Web server into the back-end system must have the minimum possible privilege so if someone manages to execute (say) a SQL injection that deletes data it's rejected due to a lack of permissions.
FireEye has admitted that a snafu involving its email filtering technology meant harmless messages were shuffled off to quarantine for no good reason.
The glitch persisted for around two hours during during Monday morning before the problem was resolved, as a statement by the security vendor supplied to El Reg explains.At approximately 10am BST Monday 1 August, FireEye became aware of an issue with a newly released version of the Security Content in its Email Security products that caused certain non-malicious emails to be temporarily quarantined.
A new version of Security Content was released in under two hours, limiting impact and resolving the issue for customers automatically.FireEye deploys rapid updates to Security Content in order to quickly mitigate emerging campaigns, and we will continue to improve our testing and review prior to release.El Reg heard of the “computer says no” issue from a reader – who asked to remain anonymous – and complained that FireEye “crippled email globally for all their customers running email protection”, a comment that doubtless stemmed from understandable personal frustration.
Black Hat video Car hackers Charlie Miller and Chris Valasek have again hacked a 2014 Jeep Cherokee, this time by physically linking a laptop to commandeer its steering and kill the brakes.The duo have captured the hack to be presented at Black Hat Las Vegas this week in video proof-of-concept demonstrations.The compromise requires attackers to be physically present in order to compromise the car.However Miller confirmed this writer's suggestion that the attacks could be carried out using a concealed device which either contains automated and timed commands, or with remote attacks over a wireless link.Such a feat which Miller says were most definitely possible could be considered a vector for targeted, albeit over-engineered, assassination.The localised attack is similar to other CAN bus attacks in which researchers have popped locks, compromised steering, and brakes.There are legitimate uses for tapping CAN buses that have spawned companies which manufacture products that tap into the ports in order to display detailed fuel consumption and engine data to drivers, for example.

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In one of the proof-of-concept videos Miller sits in the back of the Jeep with a lead connecting his laptop to the CAN bus above the dashboard.
Valasek cruises at low speed through a cornfield road until Miller causes the steering wheel of the Jeep to lock 90 degrees to the right sending it off road.The attack affects the same Jeep which was patched after the duo remotely hacked it last year killing the engine during a live demonstration on US highway I-64.
The pair attacked the Jeep's electronic control units disabling one by sending it into a maintenance mode and using another to send spoofed commands.Cruise control speed can also be set but drivers can quickly regain control by tapping brakes.
The pair say they've penned a paper, to be revealed at Black Hat, in which they recommend vehicle manufacturers should better lock down CAN buses. To help auto-makers along, the pair have built an intrusion detection system that can detect their attacks. Black Hat Neil Wyler and Bart Stump are responsible for managing what is probably the world’s most-attacked wireless network.The two friends, veterans among a team of two dozen, are at the time of writing knee deep in the task of running the network at Black Hat, the security event where the world reveals the latest security messes.
The event kicks off with three days of training, then unleashes tempered anarchy as the conference proper gets under way.Wyler, better known as Grifter (@grifter801), heads the NoC – the network operations centre – at Black Hat, an event he has loved since he was 12 years old. “I literally grew up among the community,” he says.Wyler's day job is working for RSA's incident response team while Stumper is an engineer with Optiv, but their Black Hat and DEF CON experience trumps their professional status. Wyler has worked with Black Hat for 14 years and DEF CON for 17 years, while Stump has chalked up nine years with both hacker meets.Together with an army of capable network engineers and hackers, they have operated two of the few hacker conference networks that delegates and journalists are advised to avoid.Rightly so; over the next week the world’s talented hacker contingent will flood Las Vegas for Black Hat and DEF CON, the biggest infosec party week of the year. The diverse talents – and ethics – of the attending masses render everything from nearby ATMs to medical implants potentially hostile and not-to-be-trusted.

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Some 23 network and security types operate the Black Hat NoC and are responsible for policing that particular conference's network, which they helped create. Come August each member loosens the strict defensive mindset they uphold in their day jobs as system administrators and security defenders to let the partying hackers launch all but the nastiest attacks over their network.“We will sit back and monitor attacks as they happen, Wyler tells The Register from his home in the US. It's not your average security job.The crew operates with the conference din as a background, sometimes to cheers as speakers pull off showy hacks or offer impressive technical demos in rotating shifts. In the Black Hat NoC, some laugh, some sleep, and all work in a darkness broken by the glow of LEDs and computer screens. Their score is a backdrop of crunching cheese Nachos, old hacker movies, and electronic music.Picture it in the movies, and that's what it's like, Stump says, commiserating with your Australia-based scribe's Vegas absence. It'll be quite a sight, you'll be missing something.
Delegates need not. The Black Hat NoC will again be housed in The Fish Bowl, a glass den housing the crew and mascots Lyle the stuffed ape and Helga the inflatable sheep. Delegates are welcome to gawk.The Black Hat NoC operators need to check their defensive reflexes at the door in part to allow a user base consisting almost entirely of hackers to pull pranks and spar, and in part to allow presenters to legitimately demonstrate the black arts of malware.When you see traffic like that, you immediately go into mitigation mode to respond to that threat, Wyler says. Black Hat is a very interesting network because you can't do that – we have to ask if we are about to ruin some guy's demonstration on stage in front of 4,000 people.Stump recalls intruding on a training session to claim the scalp of a Black Hat black hat slinging around the infamous Zeus banking trojan on the network: The presenter says 'it's all good, we are just sending it up to AWS for our labs' and we had a laugh; I couldn't take the normal security approach and simply block crazy shit like this.Flipping malware will get you noticed and monitored by one of the Black Hat NoC's eager operators who will watch to see if things escalate beyond what's expected of a normal demonstration.If legitimate attacks are seeping out of a training room, the sight of Wyler, Stump, or any other NoC cop wordlessly entering with a walkie-talkie clipped to hip and a laptop under arm is enough for the Black Hat activity to cease. It is part of the fun for us, Wyler says. Being able to track attacks to a location and have a chat.

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