Advisory Details

April 15th, 2015

Microsoft Word Use-After-Free Remote Code Execution Vulnerability

ZDI-15-132
ZDI-CAN-2686

CVE ID CVE-2015-1650
CVSS SCORE 6.8, (AV:N/AC:M/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Word
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Word. 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 processing of abstract number elements in numbering.xml. By adding unexpected nodes within an abstractNum node, the attacker can cause memory to be used after it is freed, leading to arbitrary code execution in the context of the Word 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/ms15-033.aspx
DISCLOSURE TIMELINE
  • 2015-01-27 - Vulnerability reported to vendor
  • 2015-04-15 - Coordinated public release of advisory
CREDIT 3S Labs
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