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U SMB Redirection Countermeasures can be mitigated in several ways The risk presented by SMB redirection attacks
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When this HTML renders in IE or Outlook/Outlook Express, the nullgif file is loaded, and the victim will initiate an SMB session with attacker_server The shared resource does not even have to exist Once the victim is fooled into connecting to the attacker s system, the only remaining feature necessary to complete the exploit is to capture the ensuing LM response, and we ve seen how trivial this is using SMBCapture in 5 Assuming that SMBCapture is listening on attacker_server or its local network segment, the NTLM challenge-response traffic will come pouring in One variation on this attack is to set up a rogue SMB server to capture the hashes, as opposed to a sniffer like SMBCapture In 6, we discussed rogue SMB servers like SMBRelay that can capture hashes or even log on to the victim s machine using the hijacked credentials
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One is to ensure that network security best practices are followed Keep SMB services within protected networks: severely restrict outbound SMB traffic at border firewalls, and ensure that the overall network infrastructure does not allow SMB traffic to pass by untrusted nodes A corollary of this remedy is to ensure that physical network access points (wall jacks, and so on) are not available to casual passers-by (Remember that this is made more difficult with the growing prevalence of wireless networking) In addition, although it s generally a good idea to use features built-in to networking equipment or DHCP to prevent intruders from registering physical and network-layer addresses without authentication, recognize that sniffing attacks do not require the attacker to obtain a MAC or IP address They operate in promiscuous mode Second, configure all Windows systems within your environment to disable propagation of the LM and NTLM hashes on the wire This is done using the LAN Manager Authentication Level setting (See s 5 and 6) The best defense for this attack is to Require SMB Packet Signing on your machine Any sessions that are hijacked in the preceding manner won t be able to connect back to your box with this setting enabled (It s in Group Policy Security Settings under Windows 2000)
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MHarvesting NTLM Credentials Using Telnet://
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As if the file:// URL weren t bad enough, Microsoft Internet client software automatically parses telnet://server URLs and opens a connection to server This also allows an attacker to craft an HTML email message that forces an outbound authentication over any port:
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U Countermeasures for Telnet:// Attacksoutbound NTLM authentication traffic be Network security best practices dictate that
Normally, this wouldn t be such a big deal, except that on Win 2000, the built-in telnet client is set to use NTLM authentication by default Thus, in response to the preceding HTML, a Win 2000 system will merrily attempt to log on to evilipaddress using the standard NTLM challenge-response mechanism This mechanism, as we saw in 5, can be vulnerable to eavesdropping and man-in-the-middle (MITM) attacks that reveal the victim s username and password This attack affects a multitude of HTML parsers and does not rely on any form of Active Scripting, JavaScript or otherwise Thus, no IE configuration can prevent this behavior Credit goes to DilDog of Back Orifice fame, who posted this exploit to Bugtraq
blocked at the perimeter firewall However, this attack causes NTLM credentials to be sent over the telnet protocol Make sure to block outbound telnet at the perimeter gateway as well At the host level, configure Win 2000 s telnet client so that it doesn t use NTLM authentication To do this, run telnet at the command prompt, enter unset ntlm, and then exit telnet to save your preferences into the Registry Microsoft has also provided a patch in MS00-067 that presents a warning message to the user before automatically sending NTLM credentials to a server residing in an untrusted zone (MS00-067 can be found at http://wwwmicrosoftcom/technet/treeview/defaultasp url=/technet/security/ bulletin/MS00-067asp) This has also been fixed in Window 2000 SP2 This vulnerability is cataloged as Bugtraq ID 1683 (http://wwwsecurityfocuscom/bid/1683) It s also pertinent to mention here that the LAN Manager Authentication Level setting in Security Policy can make it much more difficult to extract user credentials from NTLM challenge-response exchanges, as discussed in 5 Setting it to Send NTLMv2 Response Only or higher can greatly mitigate the risk from LM/NTLM eavesdropping attacks (This assumes the continued restricted availability of programs that will extract hashes from NTLMv2 challenge-response traffic) Rogue server and man-in-the-middle (MITM) attacks against NTLMv2 authentication are still feasible, assuming that the rogue/MITM server can negotiate the NTMv2 dialect with the server on behalf of the client
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