Microsoft Outlook contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.
A vulnerability in Microsoft Outlook could allow an unauthenticated, remote attacker to execute arbitrary code.
The vulnerability is due to improper handling of crafted Secure/Multipurpose Internet Mail Extensions (S/MIME) email messages by the affected software. An attacker could exploit the vulnerability by sending a targeted user an email that is designed to submit malicious input to the affected software. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
Microsoft Outlook versions 2007 SP3 and 2010 (32-bit and 64-bit) SP1 and SP2 are affected.
To exploit the vulnerability, the attacker may provide a crafted email, intended to submit malicious input to the affected software, to a user and use misleading language or instructions to persuade the user to open the provided email message.
Microsoft has resolved the vulnerability by correcting how Outlook handles S/MIME formatted email.
Microsoft has released a security bulletin at the following link: MS13-068
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
The vulnerability is due to improper memory operations performed by the affected software when handling crafted S/MIME email messages and certificates.
An attacker could exploit the vulnerability by sending an email to a targeted user that is designed to submit malicious input to the affected software. When the input is processed, a memory error could occur that the attacker could use to execute arbitrary code. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the user. If the user holds elevated privileges, the attacker could completely compromise the targeted system.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.
Administrators are advised to monitor critical systems.
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.
The security vulnerability applies to the following combinations of products.
2007 SP3 | 2010 SP1, SP2
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