Advisory Details

July 12th, 2016

Adobe Flash StyleSheet Use-After-Free Remote Code Execution Vulnerability

ZDI-16-426
ZDI-CAN-3744

CVE ID CVE-2016-4174
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Adobe
AFFECTED PRODUCTS Flash
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 24736. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Adobe Flash. 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 StyleSheet objects. By calling the parseCSS method of the StyleSheet object from within a specific callback function, an attacker can force a dangling pointer to be reused after it has been freed. An attacker can leverage this vulnerability to execute arbitrary code under the context of the current process.

ADDITIONAL DETAILS Adobe has issued an update to correct this vulnerability. More details can be found at:
https://helpx.adobe.com/security/products/flash-player/apsb16-25.html
DISCLOSURE TIMELINE
  • 2016-05-09 - Vulnerability reported to vendor
  • 2016-07-12 - Coordinated public release of advisory
CREDIT Kai Kang (a.k.a 4B5F5F4B)
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