Advisory Details

August 11th, 2015

Microsoft Internet Explorer COrphanedStyleSheetArray Use-After-Free Remote Code Execution Vulnerability

ZDI-15-385
ZDI-CAN-2963

CVE ID CVE-2015-2451
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Internet Explorer
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Internet Explorer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The vulnerability relates to how Internet Explorer processes CSS stylesheets associated with HTML documents. By manipulating a document's elements an attacker can cause a COrphanedStyleSheetArray object in memory 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 Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/library/security/MS15-079
DISCLOSURE TIMELINE
  • 2015-05-28 - Vulnerability reported to vendor
  • 2015-08-11 - Coordinated public release of advisory
CREDIT 0016EECD9D7159A949DAD3BC17E0A939
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