Posts tagged: Facebook Exploit

Oct 27 2011

Facebook Attach EXE Vulnerability

Summary:
When using the Facebook ‘Messages’ tab, there is a feature to attach a file. Using this feature normally, the site won’t allow a user to attach an executable file. A bug was discovered to subvert this security mechanisms. Note, you do NOT have to be friends with the user to send them a message with an attachment.

Description:
When attaching an executable file, Facebook will return an error message stating:
“Error Uploading: You cannot attach files of that type.”

Facebook Error Uploading

When uploading a file attachment to Facebook we captured the web browsers POST request being sent to the web server. Inside this POST request reads the line:

Content-Disposition: form-data; name=”attachment”; filename=”cmd.exe”

It was discovered the variable ‘filename’ was being parsed to determine if the file type is allowed or not.

To subvert the security mechanisms to allow an .exe file type, we modified the POST request by appending a space to our filename variable like so:

filename=”cmd.exe ”

Facebook Post Hack

This was enough to trick the parser and allow our executable file to be attached and sent in a message.

Facebook Hot Stuff

Impact:
Potentially allow an attacker to compromise a victim’s computer system.

Affected Products:
www.facebook.com

Time Table:
09/30/2011 Reported Vulnerability to the Vendor
10/26/2011 Vendor Acknowledged Vulnerability
10/27/2011 Publicly Disclosed

Credits:
Discovered by Nathan Power
www.securitypentest.com

Execution POC:

Oct 15 2010

Facebook Hack – View photo albums of non-friends

A new facebook exploit allows anyone to access any photo album of non-friends as long as you have the link.

Facebook Photo Exploit

By following the simple steps shown in above image, you can bypass the security of Facebook and view photos of others online.