Advisory Details

August 11th, 2015

(Pwn2Own) Microsoft Windows TrueType Fonts Out-Of-Bounds Write Remote Code Execution Vulnerability

ZDI-15-388
ZDI-CAN-2818

CVE ID CVE-2015-2455
CVSS SCORE 10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Windows
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 processing of the IUP instruction (opcode 0x31) in TrueType fonts. A crafted font can cause point patching to modify arbitrary addresses in the Windows kernel. This can be leveraged by an attacker to run arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://technet.microsoft.com/library/security/MS15-080
DISCLOSURE TIMELINE
  • 2015-03-18 - Vulnerability reported to vendor
  • 2015-08-11 - Coordinated public release of advisory
CREDIT KeenTeam's Jihui Lu and Peter Hlavaty
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