===================================================================== CERT-Renater Note d'Information No. 2011/VULN373 _____________________________________________________________________ DATE : 11/05/2011 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Systems running Microsoft PowerPoint, Microsoft Office, Open XML File Format Converter for Mac, Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2. ====================================================================== KB2545814 http://www.microsoft.com/technet/security/bulletin/MS11-036.mspx ______________________________________________________________________ Microsoft Security Bulletin MS11-036 - Important Vulnerabilities in Microsoft PowerPoint Could Allow Remote Code Execution (2545814) Published: May 10, 2011 Version: 1.0 General Information Executive Summary This security update resolves two privately reported vulnerabilities in Microsoft PowerPoint. The vulnerabilities could allow remote code execution if a user opens a specially crafted PowerPoint file. An attacker who successfully exploited either of these vulnerabilities could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Installing and configuring Office File Validation (OFV) to prevent the opening of suspicious files blocks the attack vectors for exploiting the vulnerabilities described in CVE-2011-1269 and CVE-2011-1270. See the section, Frequently Asked Questions (FAQ) Related to This Security Update, for more information about how the Office File Validation feature can be configured to block the attack vectors. This security update is rated Important for all supported editions of Microsoft PowerPoint 2002, Microsoft PowerPoint 2003, Microsoft PowerPoint 2007, Microsoft Office 2004 for Mac, and Microsoft Office 2008 for Mac. The security update is also rated Important for all supported versions of Open XML File Format Converter for Mac and Microsoft Office Compatibility Pack. For more information, see the subsection, Affected and Non-Affected Software, in this section. The update addresses the vulnerabilities by correcting the way that PowerPoint handles memory when parsing specially crafted PowerPoint files. Affected Software Microsoft PowerPoint 2002 Service Pack 3 Microsoft PowerPoint 2003 Service Pack 3 Microsoft PowerPoint 2007 Service Pack 2 Microsoft Office 2004 for Mac Microsoft Office 2008 for Mac Open XML File Format Converter for Mac Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2 Presentation Memory Corruption RCE Vulnerability - CVE-2011-1269 A remote code execution vulnerability exists in the way that Microsoft PowerPoint handles specially crafted PowerPoint files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1269. Mitigating Factors for Presentation Memory Corruption RCE Vulnerability - CVE-2011-1269 Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation: In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker's Web site, and then convince them to open the specially crafted PowerPoint file. The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Presentation Buffer Overrun RCE Vulnerability - CVE-2011-1270 A remote code execution vulnerability exists in the way that Microsoft PowerPoint handles specially crafted PowerPoint files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1270. Mitigating Factors for Presentation Buffer Overrun RCE Vulnerability - CVE-2011-1270 Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation: In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker's Web site, and then convince them to open the specially crafted PowerPoint file. The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 23 - 25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================