Zero Day Initiative Advisory 11-139 – This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari Webkit. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the library’s implementation of a frame element.

Zero Day Initiative Advisory 11-138 – This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari Webkit. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the application’s implementation of a Frame element.

The VUPEN Vulnerability Research Team discovered a critical vulnerability in Apple Safari. The vulnerability is caused by a use-after-free error in the WebKit library when processing certain text nodes, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.