Advisory Details

December 8th, 2015

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

ZDI-15-599
ZDI-CAN-3283

CVE ID CVE-2015-6151
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 tracks selected text on a web page. By manipulating a document's elements an attacker can force a CSelectTracker object in memory to be reused after it has been freed. An attacker can leverage this vulnerability to execute 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/en-us/library/security/ms15-124.aspx
DISCLOSURE TIMELINE
  • 2015-09-04 - Vulnerability reported to vendor
  • 2015-12-08 - Coordinated public release of advisory
CREDIT Li kemeng of Baidu Security Lab
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