Feeds

PDF security hole opens can of worms

Proof of concept out

Protecting against web application threats using SSL

The security perils of PDF files have been further highlighted by new research illustrating how a manipulated file might be used to infect other PDF files on a system.

Jeremy Conway, an application security researcher at NitroSecurity, said the attack scenario he has discovered shows PDFs are "wormable". Computer viruses are capable, by definition, of overwriting other files to spread. Conway's research is chiefly notable for illustrating how a benign PDF file might become infected using features supported by PDF specification, not a software vulnerability as such, and without the use of external binaries or JavaScript.

The "wormable PDF" research comes days after another security researcher, Didier Stevens, showed how it was possible to both embed malicious executables in PDFs and manipulate pop-up dialog boxes to trick victims into running a malicious payload. Both Adobe and FoxIT are working on a fix against the security shortcomings in their respective PDF viewing packages illustrated by the research.

Conway, who last week published an advisory and proof of concept video demo on wormable PDFs, said he was inspired to hunt for related vulnerabilities in the PDF specification by Stevens' research. A fix capable of blocking the security loophole discovered by Stevens ought to also prevent the possibility of 'worming' PDFs. "If the vendors figure out a method to prevent Didier’s example this same fix will stop this proof of concept as well," Conway writes.

A follow-up blog post by Conway explains the implications of the security shortcomings of PDF files in greater depth.

"I chose to infect the benign PDF with another, and launch a hack that redirected a user to my website, but this could have just as easily been an exploit pack and or embedded Trojan binary," Conway explains. "Worse yet this dynamic infection vector could be utilised to populate all PDFs for some new O-day attack, thereby multiplying an attackers infection vehicles while still exploiting user systems ('worm-able')."

An informative blog post by Mikko Hypponen, chief research officer at net security firm F-Secure, explains how all sorts of unexpected content is supported by the PDF specification.

Media files, JavaScript and forms that upload data a user inputs to an external web server are all supported by the PDF specification in addition to embedded executables. These little-known features go a long way towards explaining both why PDF applications such as Adobe Reader takes ages to load and why the file format has become such a firm favourite with hackers over the last year or so, Hypponen notes. ®

Reducing the cost and complexity of web vulnerability management

More from The Register

next story
Spies would need SUPER POWERS to tap undersea cables
Why mess with armoured 10kV cables when land-based, and legal, snoop tools are easier?
Apple Pay is a tidy payday for Apple with 0.15% cut, sources say
Cupertino slurps 15 cents from every $100 purchase
Critical Adobe Reader and Acrobat patches FINALLY make it out
Eight vulns healed, including XSS and DoS paths
Israeli spies rebel over mass-snooping on innocent Palestinians
'Disciplinary treatment will be sharp and clear' vow spy-chiefs
YouTube, Amazon and Yahoo! caught in malvertising mess
Cisco says 'Kyle and Stan' attack is spreading through compromised ad networks
Hackers pop Brazil newspaper to root home routers
Step One: try default passwords. Step Two: Repeat Step One until success
Microsoft to patch ASP.NET mess even if you don't
We know what's good for you, because we made the mess says Redmond
NORKS ban Wi-Fi and satellite internet at embassies
Crackdown on tardy diplomatic sysadmins providing accidental unfiltered internet access
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Security and trust: The backbone of doing business over the internet
Explores the current state of website security and the contributions Symantec is making to help organizations protect critical data and build trust with customers.