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Revue de presse francophone :
- Appaloosa AppDome nouent un partenariat pour accompagner les entreprises dans le déploiement et la protection des applications mobiles
- D-Link offre une avec un routeur VPN sans fil AC
- 19 mai Paris Petit-Déjeuner Coreye Développer son business à l'abri des cyberattaques
- POYNTING PRESENTE LA NOUVELLE ANTENNE OMNI-291, SPECIALE MILIEU MARITIME, CÔTIER ET MILIEU HUMIDE
- Flexera Software Les utilisateurs français de PC progressent dans l'application de correctifs logiciels, mais des défis de tailles subsistent
- Riverbed lance SD-WAN basé sur le cloud
- Fujitsu multi-récompensé VMware lui décerne plusieurs Partner Innovation Awards à l'occasion du Partner Leadership Summit
- Zscaler Private Access sécuriser l'accès à distance en supprimant les risques inhérents aux réseaux privés virtuels
- QNAP annonce la sortie de QTS 4.2.1
- Une enquête réalisée par la société de cyber sécurité F-Secure a décelé des milliers de vulnérabilités graves, potentiellement utilisables par des cyber criminels pour infiltrer l'infrastru
- Trouver le juste équilibre entre une infrastructure dédiée et cloud le dilemme de la distribution numérique
- 3 juin - Fleurance - Cybersécurité Territoires
- Cyber-assurances Seules 40 pourcents des entreprises françaises sont couvertes contre les violations de sécurité et les pertes de données
- Des étudiants de l'ESIEA inventent CheckMyHTTPS un logiciel qui vérifie que vos connexions WEB sécurisées ne sont pas interceptées
- Les produits OmniSwitch d'Alcatel-Lucent Enterprise ALE gagnent en sécurité pour lutter contre les cyber-attaques modernes

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- DIP, solution de partage d'informations automatisée
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- Renaud Bidou (Deny All): "L'innovation dans le domaine des WAFs s'oriente vers plus de bon sens et d'intelligence, plus de flexibilité et plus d'ergonomie"
- Mises à jour en perspective pour le système Vigik
- Les russes ont-ils pwn le système AEGIS ?
- Le ministère de l'intérieur censure une conférence au Canada
- Saut d'air gap, audit de firmware et (in)sécurité mobile au programme de Cansecwest 2014
- GCHQ: Le JTRIG torpille Anonymous qui torpille le JTRIG (ou pas)
- #FIC2014: Entrée en territoire inconnu
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Revue de presse internationale :
- VEHICLE CYBERSECURITY DOT and Industry Have Efforts Under Way, but DOT Needs to Define Its Role in Responding to a Real-world Attack
- Demand letter served on poll body over disastrous Comeleak breach
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- Hacker With Victims in 100 Nations Gets 7 Years in Prison
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- 2016 Hack Miami Conference May 13-15, 2016
- 8-bit Video Wall Made From 160 Gaming Keyboards
- In An Era Of Decline, News Sites Can t Afford Poor Web Performance
- BeautifulPeople.com experiences data breach 1m affected
- Swedish Air Space Infringed, Aircraft Not Required
- Why cybercriminals attack healthcare more than any other industry
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Annuaire des videos
- FUZZING ON LINE PART THREE
- Official Maltego tutorial 5 Writing your own transforms
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- install zeus botnet
- Eloy Magalhaes
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Revue Twitter
- RT @fpalumbo: Cisco consistently leading the way ? buys vCider to boost its distributed cloud vision #CiscoONE
- @mckeay Looks odd... not much to go on (prob some slideshow/vid app under Linux)
- [SuggestedReading] Using the HTML5 Fullscreen API for Phishing Attacks
- RT @BrianHonan: Our problems are not technical but cultural. OWASP top 10 has not changed over the years @joshcorman #RSAC
- RT @mikko: Wow. Apple kernels actually have a function called PE_i_can_has_debugger:
- [Blog Spam] Metasploit and PowerShell payloads
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- @mikko @fslabs y'all wldn't happen to have lat/long data sets for other botnets, wld you? Doing some research (free/open info rls when done)
- RT @nickhacks: Want to crash a remote host running Snow Leopard? Just use: nmap -P0 -6 --script=targets-ipv6-multicast-mld #wishiwaskidding
- An inexpensive proxy service called is actually a front for #malware distribution -

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Top bi-hebdo de la revue Twitter
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XHR, CSRF and bypassing the browser same origin policy

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XHR, CSRF and bypassing the browser same origin policy

Par Writing Secure Software
Le [2011-06-17] à 15:39:15



Présentation : I did a presentation on CSRF for my local OWASP chapter and an interesting question come out about exploiting a CSRF vulnerability while using XMLHttpRequests these are very popular wih Ajax nowdays.. CSRF vulnerabilities exploit the trust that a site has on the browser. In the case of an authenticated session, since the browser does not resend a NEW SessionID to the application as a proof that each HTTP request is authenticated it allow for riding the session with an interleaved malicious HTTP request I like this term better actually because you are really riding an authenticated session.. . If I social engineer phish a victim forcing him to select a web page via webmial for example that has a malicious HTML tag such as iframe with an embedded GET request and if such request is issued by the victim web page selection when an authenticated session with the same application is still valid, then such malicious request will processed by the application. Attack of this nature can eventually force a business transaction such as money bank transfer, denial of service via forced logout, modification of shopping cart credentials to force a purchase with a price and address at the choice of a malicious user. The main root causes of CSRF on the client is the lack of enforcement of the same origin policy. Such policy prevent two different documents loaded on the browser and one potentially being malicious to access each other via javascript. The same origin policy will check that such javascript invocation comes from two different sources and it will deny it. The problem is that such same origin policy does not work for HTML tags an hacker can embed an URL from untrusted source domain in one of the documents serve such document to the victim and the request will still be issued to the site and being authenticated by the application. Contrary to HTML tags, in the case of issuing asynch requests via XmlHttpRequest XHR the same origin policy is enforced on the browser and in-theory a CSRF attack will be mitigated by the browser control. The reality is that if malware is present on the client such as with XSS exploit for example , then you can potentially override this control, simply because XHR relies on client javascript. In other cases if the control is invoked via a flash the same origin policy can be actually disabled to this vulnerability as a configuration management issue. Here are the facts in the details 1 XMLHttpRequest has a same origin policy enforced in both IE and Mozilla 2 Because of the same origin policy you cannot access, a document script loaded from one site of origin from a site from a different origin 3 XMLHttpRequest rely on javascript to issue POSTs such as var post_data 'name value' var xmlhttp new ActiveXObject Microsoft.XMLHTTP xmlhttp.open POST , 'http url path file.ext', true xmlhttp.onreadystatechange function if xmlhttp.readyState 4 alert xmlhttp.responseText xmlhttp.send post_data 4 Since XHR rely on javascript, you can have malware like Samy webworm that exploits both XSS and CSRF installed on the client that can overwrite the javascript function by overriding the constructor XMLHttpRequest By doing so the hacker is bypassing the XHR call and will disables the same origin functionality enforced on XHR 5 The same origin policy can also be bypassed with a flash Adobe Macromedia Flash to issue XHR because cross domain is permitted depending on a rule set in crossdomain.xml file present in the root of the target webserver. So basically like everything else in security, there is no 100pourcents mitigation of the risk. In the case of XHR CSRF browser controls can also be bypassed despite the same origin policy on the browser. The golden rule for security is to rely on multi layer security, XHR with same origin policy but also unique token for each URL and tied to the user session like you can do by using OWASP Guard. To remediate CSRF vulnerabilities every HTTP request not just the one that you login into it that can potentially exploited for unauthorized transactions i.e. HTTP POST of confidential data, high risk transactions need to be authenticated by issuing a new token sessionID or event by requiring a PIN References http taossa.com index.php 2007 02 08 same-origin-policy http www.cgisecurity.com articles csrf-faq.shtml http jeremiahgrossman.blogspot.com 2007 01 preventing-csrf-when-vulnerable-to-xss.html http taossa.com index.php 2007 02 08 same-origin-policy

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