Fortinet Discovers Microsoft Office Word Double Free Vulnerability
Fortinet's FortiGuard Labs has discovered a double free vulnerability in Microsoft Office Word.
Microsoft Office is an office suite of applications, servers and services. It was first announced by Microsoft in 1988. The first version of Office contained Microsoft Word, Microsoft Excel and Microsoft PowerPoint. Over the years, Office applications have grown substantially closer with shared features such as a common spell checker, OLE data integration and Visual Basic for Applications scripting language. Microsoft also positions Office as a development platform for line-of-business software under the Office Business Applications brand.
A double free vulnerability was discovered in Microsoft Word when it fails to validate that a pointer was already released before attempting to release it again, causing conditions that attackers could leverage to achieve remote code execution scenarios. The underlying problem involves an internal structure that gets released without resetting the address to NULL. This causes Excel to release the pointer twice on certain resource consumption cases when it is running out of memory.
SolutionsFortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:
Released Nov 30, 2015
Users should apply the solution provided by Microsoft.
This vulnerability was discovered by Kai Lu of Fortinet's FortiGuard Labs.