Microsoft has released 11 security bulletins to address 24 vulnerabilities in Windows, Internet Explorer, Office and Exchange. Among them is the fix for the TIFF file vulnerability in Windows Vista and Windows Server 2008, Microsoft Office 2003 to 2010, and all supported versions of Microsoft Lync. However a fix for the zero-day vulnerability in Windows XP, which is being actively exploited in the wild via a malicious PDF file, is missing.
MS13-096 fixes the publicly disclosed vulnerability that can allow remote code execution if a user views content that contains specially crafted TIFF files. According to Microsoft an attacker who successfully exploits this vulnerability can execute arbitrary code with the privileges of the user who viewed the TIFF file.
The vulnerability is currently being exploited in the wild and targeting PC users mainly in the Middle East and South Asia. The attack uses an email with a specially crafted Word attachment. However the security bulletin points out that this isn’t the only possible attack vector. The vulnerability can be exploited in a web-based attack scenario, where an attacker creates a website that is designed to exploit this vulnerability and then convinces a user to view the website, or via email.
Another Critical rated fix is MS13-097, a cumulative update for Internet Explorer. The patch resolves seven privately reported vulnerabilities in IE, the most severe vulnerabilities could allow remote code execution if a user views a specially crafted webpage. The update affects Internet Explorer 6 through to Internet Explorer 11.
MS13-099 resolves a vulnerability in Microsoft Scripting Runtime Object Library that could allow remote code execution if a user visits a specially crafted website. The update is rated as Critical for Windows Script 5.6, Windows Script 5.7, and Windows Script 5.8 where affected on all supported releases of Microsoft Windows.
Security Bulletin MS13-106 fixes a publicly disclosed vulnerability in a Microsoft Office shared component that is currently being exploited in the wild. The problem exists because hxds.dll in Microsoft Office 2007 SP3 and 2010 SP1 and SP2 do not implement the ASLR protection mechanism, which makes it easier for remote attackers to execute arbitrary code via a crafted COM component on a web site that is visited with IE. The security feature bypass by itself does not allow arbitrary code execution. However, an attacker could use this ASLR bypass vulnerability in conjunction with another vulnerability, such as a remote code execution vulnerability that could take advantage of the ASLR bypass to run arbitrary code.
The other Critical bulletins are:
- MS13-098 - Resolves a privately reported vulnerability in Microsoft Windows that could allow remote code execution if a user or application runs or installs a specially crafted, signed portable executable (PE) file on an affected system.
- MS13-105 – Resolves three publicly disclosed vulnerabilities and one privately reported vulnerability in Microsoft Exchange Server. The most severe of these vulnerabilities exist in the WebReady Document Viewing and Data Loss Prevention features of Microsoft Exchange Server.
The Important bulletins from Microsoft are:
- MS13-100 - Resolves multiple privately reported vulnerabilities in Microsoft Office server software. These vulnerabilities could allow remote code execution if an authenticated attacker sends specially crafted page content to a SharePoint server.
- MS13-101 - Resolves five privately reported vulnerabilities in Microsoft Windows. The more severe of these vulnerabilities could allow elevation of privilege if an attacker logs on to a system and runs a specially crafted application.
- MS13-102 - Addresses a privately reported vulnerability in Microsoft Windows that could allow elevation of privilege if an attacker spoofs an LRPC server and sends a specially crafted LPC port message to any LRPC client.
- MS13-104 - Resolves a privately reported vulnerability in Microsoft Office that could allow information disclosure if a user attempts to open an Office file hosted on a malicious website.