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To reduce the chances of exposure to software flaws like the ones highlighted here, make sure to keep your Internet client software fully updated and patched Of course, the only way to be certain that a site s certificate is legitimate is to manually check the server certificate presented to the browser In most browsers, clicking the little lock icon in the lower part of the browser will perform this function In IE, you can also select File | Properties while visiting an SSL-protected page to display certificate info Figure 12-2 shows IE displaying the certificate for a popular website

ms99-042asp Alternatively, you could disable Active Scripting by using the same mechanism discussed in the earlier section on security zones

Figure 12-2 By double-clicking the lock icon in Internet Explorer, you can view information about

16:

Some sites will not display an SSL lock icon, even though they may protect transactions with SSL Microsoft s Passport Internet authentication service is a good example because the current service uses HTTP POST over SSL to protect the submission of credentials, the initial Passport sign-on page does not register as SSL-protected Two other settings in IE will help users automatically verify whether a server s SSL certificate has been revoked: Check for Server Certificate Revocation and Check for Publisher Certificate Revocation under Tools | Internet Options | Advanced | Security We will discuss additional settings in the section General Microsoft Client-Side Countermeasures, later in this chapter Lastly, we think it s quite humorous to point out that, despite the tremendous security problems faced by IE in recent years, it managed to avoid the homograph attack paradigm entirely due to its lack of support for IDN This is one case where a valid countermeasure is to avoid non-IE browsers

The following attacks demonstrate many different mechanisms for executing commands on the victim s machine Many of these are activated simply by opening the malicious message or previewing it in Outlook/OE s preview pane

Popularity: Simplicity: Impact: Risk Rating: 5 6 10 7

Although they are not purely vulnerabilities unto themselves, we thought it necessary to pause for a moment to describe some of the more common techniques that have been used in the past to launch arbitrary code against users systems following an exploit of an actual vulnerability Perhaps the most adept early practitioner of such techniques was Georgi Guninski, who illustrated time and again the simple effectiveness of dropping a Microsoft Excel (xla) file or compiled HTML help file (chm) into a user s Windows startup folder, where it would be executed at next logon He also was an effective exploiter of the HTML IFRAME mechanism for referencing unexpected content And who can overlook the Run keys in the Windows Registry, leveraged so many times to plant references to executable content that would again get executed at next logon Later practitioners evolved these basic techniques, for example using the showHelp( )method and Microsoft s HTML Help hhexe to launch chm and htm files directly from exploits and dropping malicious links into the IE startup page Registry values To this day, these techniques remain overwhelmingly favored by the hacking and malware community when crafting Internet client exploits The use of so-called autostart extensibility points (ASEPs) to execute code within Windows remains in widespread use today, and it s a theme we will return to frequently in this chapter See http://researchmicrosoftcom/sm/strider/Strider_Gatekeeper_Usenix_LISA_2004pdf for a listing of common ASEPs You can run the msconfig utility on Windows XP to view ASEPs on your own system

Attacks don t get much more deadly than this: all the victim has to do is read the message (or view it in the preview pane if Outlook/OE is configured to do so) No intervention

12:

by the user is required This wonderful nastiness is brought to you again by the Scriptlettypelib ActiveX control that is marked safe for scripting, as discussed in the previous section on ActiveX Eyedogocx could just as easily be used, but this specific exploit is based on Georgi Guninski s proof-of-concept code using Scriptlettypelib at http://wwwnatbg/~joro/scrtlb-deschtml Here is a slightly modified version of his code pasted into a mail hacking capsule: