#1 Trusted Cybersecurity News Platform Followed by 3.45+ million
The Hacker News Logo
Subscribe to Newsletter

OAuth Flaw | Breaking Cybersecurity News | The Hacker News

Hackers Using Malicious OAuth Apps to Take Over Email Servers

Hackers Using Malicious OAuth Apps to Take Over Email Servers

Sep 23, 2022
Microsoft on Thursday warned of a consumer-facing attack that made use of rogue OAuth applications deployed on compromised cloud tenants to ultimately seize control of Exchange servers and spread spam. "The threat actor launched credential stuffing attacks against high-risk accounts that didn't have multi-factor authentication (MFA) enabled and leveraged the unsecured administrator accounts to gain initial access," the Microsoft 365 Defender Research Team said. The unauthorized access to the cloud tenant permitted the adversary to register a malicious OAuth application and grant it elevated permissions, and eventually modify Exchange Server settings to allow inbound emails from specific IP addresses to be routed through the compromised email server. "These modifications to the Exchange server settings allowed the threat actor to perform their primary goal in the attack: sending out spam emails," Microsoft  said . "The spam emails were sent as part of a
Facebook SDK Vulnerability Puts Millions of Smartphone Users' Accounts at Risk

Facebook SDK Vulnerability Puts Millions of Smartphone Users' Accounts at Risk

Jul 03, 2014
Security researchers from MetaIntell, the leader in intelligent led Mobile Risk Management (MRM), have discovered a major security vulnerability in the latest version of Facebook SDK that put millions of Facebook user's Authentication Tokens at risk. Facebook SDK for Android and iOS is the easiest way to integrate mobile apps with Facebook platform, which provides support for Login with Facebook authentication, reading and writing to Facebook APIs and many more. Facebook OAuth authentication or ' Login as Facebook ' mechanism is a personalized and secure way for users to sign into 3rd party apps without sharing their passwords. After the user approves the permissions as requested by the application, the Facebook SDK implements the OAuth 2.0 User-Agent flow to retrieve the secret user's access token required by the apps to call Facebook APIs to read, modify or write user's Facebook data on their behalf. ACCESSING UNENCRYPTED ACCESS TOKEN It is important that
Security breach at OAuth based applications can cause Social Media Disaster

Security breach at OAuth based applications can cause Social Media Disaster

Oct 28, 2013
With all the popular social networking websites there on the web, managing them from several different internet browser tabs or windows can get frustrated very quickly. Besides our own Facebook Page, Twitter account, and Google+ profile, I also manage several others and, YES, I feel the " time management " pain! To make social media management and monitoring easier for users, some very innovative desktop applications and mobile apps were developed to help organize multiple platforms and information sharing across selected networks. Using online tools like TweetDeck, Seesmic, Hootsuite , Feedly, Twuffer and Buffer App for scheduling and posting directly from a web page has become an absolute necessity especially where Twitter is concerned. Additionally these apps gives you the ability to post on one or all of your connected accounts together i.e Multiple Facebook, Twitter or Google+ profiles. These applications don't require your passwords for social me
Buffer hacked; Twitter, Facebook flooded with Spam Weight-loss links

Buffer hacked; Twitter, Facebook flooded with Spam Weight-loss links

Oct 27, 2013
If you're a user of the Buffer app, the social-media management service that let you cross-posting to various social networks, be aware that the service got hacked yesterday, with spam messages going out over Facebook.  " Buffer was hacked around 1 hour ago, and many of you may have experienced spam posts sent from you via Buffer. I can only understand how angry and disappointed you must be right now. " Buffer team said, in an email sent to users and also posted to Buffer's blog . It's not yet clear how many of Buffer's 1 million or so users were affected by the hack, but buffer maintains that user passwords are safe nor has any "billing or payment information been affected or exposed" . Photo Credit : The Next Web It appears that Buffer's Facebook and Twitter spam messages were first sent at around 2:20 p.m. ET. Hackers have used the exploit to spam user accounts on Facebook, Twitter, Google+, and other sites. Just recently, Instagram saw a viral wa
Hacking Instagram Accounts using OAuth vulnerability

Hacking Instagram Accounts using OAuth vulnerability

May 02, 2013
' Nir Goldshlager ' known as Facebook hacker and founder of Break Security  , who reported many critical bugs in Facebook OAuth mechanism in past few months, today disclose a critical  vulnerability in Instagram Oauth that allow an attacker to hack any account. Succesful hack allows attacker to access private photos, ability to delete victim's photos and to edit comments and also the ability to post new photos. Hacker explained that there are two ways to hack Instagram accounts using OAuth, first via Hijack Instagram accounts using the Instagram OAuth or Hijack Instagram accounts using the Facebook OAuth Dialog. During his bug hunting Nir found loopholes in Instagram's security parameters i.e redirect_uri , that allows  attacker to pass the access token to his own domain with mx as suffix i.e code straight to breaksec.com.mx . POC :  https://instagram.com/oauth/authorize/?client_id=33221863eec546659f2564dd71a8a38d&redirect_uri=https://breaksec
URL Redirection flaw in Facebook apps push OAuth vulnerability again in action

URL Redirection flaw in Facebook apps push OAuth vulnerability again in action

Apr 04, 2013
In earlier posts, our Facebook hacker ' Nir Goldshlager ' exposed two serious Facebook oAuth Flaws. One, Hacking a Facebook account even without the user installing an application on their account and second, various ways to bypassing the regex protection in Facebook OAuth. This time, Nir illustrated a scenario attack  " what happens when a application is installed on the victim's account and how an attacker can manipulate it so easily " According to hacker, if the victim has an installed application like Skype or Dropbox, still hacker is able to take control over their accounts.  For this, an attacker required only a url redirection or cross site scripting  vulnerability on the Facebook owner app domain i.e in this scenario we are talking about skype facebook app. In many bug bounty programs URL redirection is not considered as an valid vulnerability for reward i.e Google Bug bounty Program. Nir also demonstrated that an attacker is even able to ga
Facebook hacking accounts using another OAuth vulnerability

Facebook hacking accounts using another OAuth vulnerability

Mar 13, 2013
Remember the last OAuth Flaw in Facebook , that allow an attacker to hijack any account without victim's interaction with any Facebook Application, was reported by white hat Hacker ' Nir Goldshlager '. After that Facebook security team fixed that issue using some minor changes. Yesterday Goldshlager once again pwn Facebook OAuth mechanism by bypassing all those minor changes done by Facebook Team. He explains the complete Saga of hunting Facebook  bug in a blog post. As explained in last report on The hacker News , OAuth URL contains two parameters i.e.  redirect_uri &   next , and using Regex Protection (%23xxx!,%23/xxx,/) Facebook team tried to secure that after last patch. In recent discovered technique hacker found that next parameter allow  facebook.facebook.com domain as a valid option and multiple hash signs is now enough to bypass Regex Protection. He use facebook.com/l.php file (used by Facebook to redirect users to external links) to redirect victims to
More Resources

Sign up for free and start receiving your daily dose of cybersecurity news, insights and tips.