For many, the Portable Document Format (PDF) has become the de-facto standard for exchanging documents. In using PDFs, some wish to sidestep the risks of malware-prone Microsoft Office documents. But with the announcement of six new PDF-related vulnerabilities in several security forums last week, we should all now be more careful with PDFs.

The first five of these new vulnerabilities have to do with the Adobe Reader plugin. Attacks that exploit these flaws may result in one of more of these results: HTTP-response splitting, cross-site scripting, session forgery, session riding, denial of service, memory corruption, or code execution. This scary list of attack results notwithstanding, a user would have to open a malicious web URL for an attack to occur. Adobe has issued Adobe Reader 8 that remedies these flaws.

The sixth new PDF vulnerability is also the sixth of the Month of Apple Bugs (MoAB) installment. If a malicious PDF document crafted to exploit this flaw were opened by a user, it would corrupt memory and could lead to code execution. Landon Fuller has posted or referred to temporary fixes for all eight MoAB flaws so far. The fix for the MoAB PDF flaw can be found here. Thank you, Landon!

Please stay secure against the PDF vulnerabilities, as we continue to protect our customers against such threats.