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computer vulnerability alert CVE-2010-0815

Microsoft Office: code execution via Visual Basic for Applications

Synthesis of the vulnerability

An attacker can invite the victim to open an Office document containing VB code and an ActiveX, in order to execute code on his computer.
Vulnerable products: Office, Access, Excel, Microsoft FrontPage, OneNote, Outlook, PowerPoint, Project, Publisher, Visio, Word.
Severity of this weakness: 3/4.
Consequences of an attack: user access/rights.
Hacker's origin: document.
Creation date: 11/05/2010.
Références of this bulletin: 978213, BID-39931, CERTA-2010-AVI-206, CVE-2010-0815, MS10-031, VIGILANCE-VUL-9636.

Description of the vulnerability

An Office document can contain VB code, which is interpreted by Visual Basic for Applications, managed by the VBE6.DLL library.

Visual Basic for Applications does not correctly manage the loading order of ActiveX. An Office document can thus contain a malicious ActiveX, and a VB code loading this ActiveX, and corrupting one byte in the memory.

An attacker can therefore invite the victim to open an Office document containing VB code and an ActiveX, in order to execute code on his computer.
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