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To check if your server has Visual Studio RAD Support installed: 1 Click Add/Remove Windows Components 2 If a check mark is present in the check box next to Internet Information Server, highlight the text and click Details
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3 In the next dialog box, scroll to the bottom of the list The next to the last entry is Visual InterDev RAD Remote Deployment Support If this box is checked, the subcomponent is installed If you installed the subcomponent, you can remove it by uninstalling via this same screen However, Microsoft recommends you still apply the patch to protect yourself if you decide to reinstall this feature at a later date Once applied, the patch ensures the corrected component is present on your system, even if you decide to reinstall the feature at a later time The patch also fixes the fp4aregdll file, but you can manually delete this as well if you aren t running FPSE 2000 In the IIS logs, attacks using fp2000ex look similar to the following:
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Back on the bridge, alarms were shrieking, and the captain knew that they were running out of time The subsea engineer had hit the emergency disconnect for the well, and although the control panel showed that the rig should be free, it wasn t The hydraulics were dead Fire continued to shoot from the top of the derrick The rig had no power, and without power, it had no pumps for the re ghting equipment, no way to shut off the ow of gas from the well, and no way to disconnect the rig from the aming umbilical that had it tethered to the wellhead All they could do was leave The captain gave the order to abandon ship
GET /_vti_bin/_vti_aut/fp30regdll fxaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaa[more a's]aaaaaaaa%cb gb gb gb gb gb gb gb gb gb gb gb gb gb gb gb gbgaaaOut-of-process+ISAPI+extension+request+failed 500
Besides the buffer overflow attacks just described, the most debilitating IIS 4 and 5 vulnerabilities announced in the first part of 2001 were an unrelated pair of file system traversal issues Given a few unrelated security misconfigurations on the same server, exploitation of these vulnerabilities can lead to complete system compromise Thus, although they don t have the same immediate impact of the buffer overflow attacks previously covered, they can be the next best thing The two file system traversal exploits we examine in the following are the Unicode and the double decode (sometimes termed superfluous decode) attacks First, we describe them in detail, and then we discuss some mechanisms for leveraging the initial access they provide into full-system conquest
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