Symantecâ¢ Security Gateways Reference Guide - Sawmill

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328 IDS eventsIntrusion attemptsNimda Worm ABase Event:Details:Response:W32_NIMDA_A_MMThe worm takes advantage of a vulnerability in Microsoft IIS which could enable a remote user toexecute arbitrary commands. This is due to the handling of CGI filename program requests.By default IIS performs two separate actions on CGI requests. The first action decodes the filenameto determine the file type (for example, .exe, .com, and so forth) and the legitimacy of the file. IISthen carries out a security check. The final process decodes the CGI parameters, which determineswhether the file will be processed or not.The final process includes an undocumented third action: not only does IIS identify the suppliedCGI parameters, but it also decodes the previously security check approved CGI filename.Therefore, if a filename composed of escaped characters passes the security check, the secondprocess will unescape the escaped characters contained in the filename, revealing the intendedactions. Depending on what the escaped characters represent, varying actions may be performed.For example,‘..%255c’ represents ‘..\’, so decoding ‘..%255c’ to ‘..\’ could leverage directory traversal attacks.The method by which this vulnerability is exploited could allow the execution of arbitrarycommands.Note that these requests are fulfilled in the context of the IUSR_machinename account. Anattacker exploiting this vulnerability is able to gain access to the host with these privileges. It maybe possible for them to gain further privileges and completely compromise the system from thispoint.It has been reported that various encoding combinations under Microsoft Windows 2000Professional and Server may yield different outcomes.It has also been reported that Personal Web Server 1.0 and 3.0 is vulnerable to this issue.The worm Nimda (and variants) actively exploit this vulnerability.Nimda sends itself out by email, searches for open network shares, attempts to copy itself tounpatched or already vulnerable Microsoft IIS Web servers, and is a virus infecting both local filesand files on remote network shares. The worm uses the Unicode Web Traversal exploit to spread tovictims surfing an already infected Web server. If you visit a compromised Web server, you will beprompted to download an .eml (Microsoft Outlook Express) email file, which contains the worm asan attachment. When the worm arrives by email, the worm uses a MIME exploit allowing the virusto be executed just by reading or previewing the file.Please refer to the following link for more information about the worm itself and possible fixtoolsagainst it:Symantec Write-up for W32.Nimda.A@mmAfter resolving the issue, try:■ Do not accept communications from unknown hosts.■■Dedicating a separate drive or volume for published content.Not running certain services on critical systems, especially those that acceptuntrusted input.
IDS eventsIntrusion attempts329Affected: Microsoft IIS 5.0Microsoft IIS 4.0Microsoft IIS 3.0Microsoft Personal Web Server 3.0Microsoft Personal Web Server 1.0False Positives: None known.<strong>Reference</strong>s: <strong>Security</strong> Focus BID: 1806CVE-2001-0884Symantec Write-up for W32.Nimda.A@mm
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Symantec Security GatewaysReference
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Licensing and registrationContactin
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6 ContentsMail server record ......
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8 ContentsChapter 9Chapter 10Append
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10 Contents
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12 Introducing Symantec security ga
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14 Introducing Symantec security ga
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16 Network security overviewSecurit
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24 Network security overviewManagem
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32 Security gateway fundamentalsRou
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38 Security gateway fundamentalsDom
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44 Understanding accessNetwork prot
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46 Understanding accessNetwork prot
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48 Understanding accessProxiesProxi
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50 Understanding accessProxiesExamp
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52 Understanding accessProxiesThe D
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54 Understanding accessProxiesThe H
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56 Understanding accessProxiesThe N
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58 Understanding accessProxiesThe S
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60 Understanding accessProxiesTable
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62 Understanding accessService grou
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64 Understanding accessRulesTable 4
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66 Understanding accessRulesWhen a
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68 Controlling service accessFilter
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70 Controlling service accessFilter
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72 Controlling service accessConten
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78 Controlling user accessAuthentic
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86 Controlling user accessTime Peri
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88 Understanding VPN tunnelsTunnels
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90 Understanding VPN tunnelsTunnels
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92 Understanding VPN tunnelsIPsec s
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100 Understanding VPN tunnelsGlobal
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102 Monitoring security gateway tra
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114 Preventing attacksAntivirus (ap
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116 Preventing attacksIntrusion det
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118 Preventing attacksLogical netwo
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120 Preventing attacksAddress trans
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126 Preventing attacksAnti-spam mea
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128 Ensuring availabilitySymantec
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130 Ensuring availabilityStateful f
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132 Ensuring availabilityCluster ad
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134 Log messagesInformational messa
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158 Log messagesNotice messages (20
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270 Log messagesEmergency messages
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272 Log messagesEmergency messages
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274 IDS eventsAbout IDS/IPS events
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276 IDS eventsAbout IDS/IPS events
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508 IDS eventsSuspicious activity
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510 IndexIP address spoofing 21Man-
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512 IndexHH.323alias report 105prox
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514 IndexRTSP 57service parameters
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516 Index
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