Apple WebKit attr() Invalid Attribute Memory Corruption VulnerabilityZDI-09-032: June 8th, 2009
TippingPoint™ IPS Customer ProtectionTippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 8043. For further product information on the TippingPoint IPS:
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple WebKit. User interaction is required to exploit this vulnerability in that the target must visit a malicious page.
The specific flaw exists in the handling of attr() functions in a CSS content object. When a large numerical value is passed as the argument to the attr() function, a memory corruption will occur which can be leveraged to execute arbitrary coder under the context of the current user.
Vendor ResponseApple has issued an update to correct this vulnerability. More details can be found at:
2009-03-26 - Vulnerability reported to vendor
2009-06-08 - Coordinated public release of advisory
CreditThis vulnerability was discovered by: