Mozilla Firefox | File Stealing Exploit
Earlier this week, Mozilla Security researcher Cody Crews discovered a malicious advertisement on a Russian news site that steals local files from a system and upload them to a Ukrainian server without the user ever knowing.
Mozilla versions of Firefox that do not contain the PDF Viewer, such as Firefox for Android, are not affected by the "Same origin violation and local file stealing via PDF reader" vulnerability.
All an attacker need to do is load the page with this exploit and sit back and relax. The exploit will silently steal files in the background.
According to Mozilla lead security researcher Daniel Veditz, the exploit specifically searches for:
- FTP configuration files, subversion, s3browser, Filezilla, libpurple and other account information on Windows systems.
- Global configuration files and user directories on Linux systems.
Any files encountered by the exploit are uploaded to a server in Ukraine.
Mac users are currently safe from this exploit, but researcher warned that another payload could potentially exploit the same vulnerability to target Mac systems.
All versions of Firefox are affected, but the good news is that Mozilla has fixed the issue in its software. So, users are recommended to update browsers to Firefox 39.0.3 to protect against the exploit. Enterprise users can patch to 38.1.1.
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