Advisory Details

August 13th, 2013

(Pwn2Own) Microsoft Windows Shared Data ASLR Security Feature Bypass Vulnerability

ZDI-13-192
ZDI-CAN-1836

CVE ID CVE-2013-2556
CVSS SCORE 5.0, (AV:N/AC:L/Au:N/C:P/I:N/A:N)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows 7
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Windows. 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 existence of KUSER_SHARED_DATA. The issue lies in the ability to predict the address of the structure, which can then be used to leak addresses. An attacker can leverage this to bypass ASLR and DEP on the host.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/en-us/security/bulletin/ms13-063
DISCLOSURE TIMELINE
  • 2013-04-26 - Vulnerability reported to vendor
  • 2013-08-13 - Coordinated public release of advisory
CREDIT VUPEN Security [ http://www.vupen.com ]
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