Another IE Bug Goes Critical
Microsoft this week again upped the severity rating of a flaw in Internet Explorer.Microsoft Corp. this week again changed the severity rating of a recently discovered vulnerability after a security researcher showed the company that the problem was more serious than Microsoft officials originally thought. The company last week upgraded the severity rating of a different flaw in Internet Explorer. The vulnerability in question this time around lies in the way that IE handles PNG (Portable Network Graphics) images. The browser fails to correctly check the parameters of PNG files when it opens them, which can result in a buffer overrun. Other Microsoft applications, including the Office products, use IE to render PNG images and exploiting this vulnerability against one of these applications would allow an attacker to run code on a users machine.
In its original advisory on Nov. 20, Microsoft gave this vulnerability a rating of "important," but on Thursday escalated it to "critical," the highest rating. The change was spurred by research from eEye Digital Security Inc., which discovered that it was possible to run code on remote users systems.