Eight Microsoft Security Bulletins are being pushed out this month, MS13-096 through MS13-106. Five of them are rated "Critical" and another six are rated "Important". The top priorities to roll out this month are the critical GDI+ (MS13-096), Internet Explorer (MS13-097), and Scripting Runtime (MS13-099) updates.
Several of the vulnerabilities have been actively exploited as a part of targeted attacks around the world, and one of them is known to be ItW for at least six months or so.
The GDI+ update patches memory corruption vulnerability CVE-2013-3906, which we have been detecting as Exploit.Win32.CVE-2013-3906.a http://www.securelist.com/en/blog/8139/CVE_2013_3906_another_0_day_for_Microsoft_Office . We have seen a low number of ITW variations on exploitation of this vulnerability as a malformed TIFF file, all dropping backdoors like Citadel, the BlackEnergy bot, PlugX, Taidoor, Janicab, Solar, and Hannover. The target profile and toolset distribution related to these exploit attempts suggest a broad array of likely threat actors that got their hands on it since this July, and a wide reaching distribution chain that provided the exploit around the world. Considering the variety of uses and sources, this one may replace cve-2012-0158 as a part of targeted attacks in terms of overall volume.
The Internet Explorer Bulletin fixes seven different elevation of privilege and memory corruption vulnerabilities, any one of which effects Internet Explorer 6 on Windows XP SP 3 through Internet Explorer 11 on Windows Server 2012 R2 and Windows RT 8.1.