Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information. Updates are available.
Microsoft Office Excel contains a vulnerability that could allow an unauthenticated, remote attacker to access sensitive information.
The vulnerability is due to improper processing of external XML entities in Microsoft Office Excel documents. An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to view a malicious document. If successful, the attacker could access sensitive information on a targeted system.
Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
The following Microsoft software is affected:
Microsoft Excel 2003 SP3 and prior
Microsoft Excel 2007 SP3 and prior
Microsoft Excel 2010 32-bit and 64-bit Editions SP2 and prior
To exploit the vulnerability, the attacker may provide a file to the user and persuade the user to open or execute the file by using misleading language or instructions.
Microsoft has released a security bulletin at the following link: MS13-073
An unauthenticated, remote attacker could exploit this vulnerability to access sensitive information from a targeted system.
The vulnerability is due to improper processing of external XML entities in Microsoft Office Excel documents.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to open a malicious document in the affected application. The processing of XML entities in the document could expose data in local files to the attacker, resulting in a disclosure of sensitive information.
Administrators are advised to apply the appropriate updates.
Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.
Administrators are advised to monitor affected systems.
Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.
Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
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