Advisory Details

August 3rd, 2012

Microsoft Windows TrueType Font Parsing Remote Code Execution Vulnerability (Remote Kernel)

ZDI-12-129
ZDI-CAN-1338

CVE ID CVE-2012-0159
CVSS SCORE 10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Microsoft
Microsoft
Microsoft
AFFECTED PRODUCTS Windows XP SP3
Windows Vista
Windows 7
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code from the contact of kernelspace 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 kernel's support for TrueType font parsing of compound glyphs. A sign extension error exists in win32k.sys when processing compound glyphs having a total number of contours above 0x7FFF. This can be exploited to corrupt kernel heap memory placed below the space allocated for the "flags" buffer and potentially execute arbitrary code in kernel space.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://technet.microsoft.com/en-us/security/bulletin/ms12-039
Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://technet.microsoft.com/en-us/security/bulletin/ms12-039
Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://technet.microsoft.com/en-us/security/bulletin/ms12-039
DISCLOSURE TIMELINE
  • 2011-11-04 - Vulnerability reported to vendor
  • 2012-08-03 - Coordinated public release of advisory
CREDIT Alin Rad Pop (binaryproof)
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