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weak passwords that were deliberately chosen and begin cracking First let s examine the content and structure of the /etc/passwd file:

The original problem was discovered in early 1997, so unless you have an early version of NetWare 4x or IntraNetWare, you may not be vulnerable But the problem allowed an attacker to execute Perl scripts from anywhere on the volume, including user directories or general access directories like LOGIN and MAIL The risk here is that attackers can create a Perl script to display important files in the browser for example, the autoexecncf or ldremotencf file storing the rconsole password

[praetorian]# cat /etc/passwd root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/bin/sh bin:x:2:2:bin:/bin:/bin/sh sys:x:3:3:sys:/dev:/bin/sh sync:x:4:65534:sync:/bin:/bin/sync man:x:6:12:man:/var/cache/man:/bin/sh lp:x:7:7:lp:/var/spool/lpd:/bin/sh mail:x:8:8:mail:/var/mail:/bin/sh

U NetWare Perl Countermeasure Perl is unfortunately not an ideal one, as you must The countermeasure for the NetWare

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uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh proxy:x:13:13:proxy:/bin:/bin/sh www-data:x:33:33:www-data:/var/www:/bin/sh backup:x:34:34:backup:/var/backups:/bin/sh nobody:x:65534:65534:nobody:/nonexistent:/bin/sh libuuid:x:100:101::/var/lib/libuuid:/bin/sh dhcp:x:101:102::/nonexistent:/bin/false syslog:x:102:103::/home/syslog:/bin/false klog:x:103:104::/home/klog:/bin/false debian-tor:x:104:113::/var/lib/tor:/bin/bash sshd:x:105:65534::/var/run/sshd:/usr/sbin/nologin nathan:x:1000:1000:Nathan Sportsman:/home/nathan:/bin/bash adam:x:1001:1001:Adam Pridgen:/home/adam:/bin/bash praveen:x:1002:1002:Praveen Kalamegham:/home/praveen:/bin/bash brian:x:1003:1003:Brian Peterson:/home/brian:/bin/bash

either disable the service altogether or upgrade to a new version M or L Upgrade the NetWare Web Server to 30 You can download the latest from http://wwwsupportnovellcom From the system console, type unload perl

Quite a bit of information is included for each user entry in the password file For the sake of brevity, we will not examine each field The important thing to note is the password field is no longer used to store the hashed password value and instead stores an x value as a placeholder The actual hashes are stored in the /etc/shadow or /etc/ masterpasswd file with tight access controls that require root privileges to read and write the file For this reason, you will need root level access to view this information This has become common practice on modern UNIX operating systems Now let s examine the contents of the shadow file:

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[praetorian]# cat /etc/shadow root:$1$xjp8B1D4$tyQNzvYCIrf1M5RYhAZlD:14076:0:99999:7::: daemon:*:14063:0:99999:7::: bin:*:14063:0:99999:7::: sys:*:14063:0:99999:7::: sync:*:14063:0:99999:7::: man:*:14063:0:99999:7::: lp:*:14063:0:99999:7::: mail:*:14063:0:99999:7::: uucp:*:14063:0:99999:7::: proxy:*:14063:0:99999:7::: www-data:*:14063:0:99999:7::: backup:*:14063:0:99999:7::: nobody:*:14063:0:99999:7::: libuuid:!:14063:0:99999:7::: dhcp:*:14063:0:99999:7::: syslog:*:14063:0:99999:7::: klog:*:14063:0:99999:7:::

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This FTP vulnerability is present only in the original FTP service from IntraNetWare The default configuration settings give anonymous users File Scan access to SYS:ETC This directory houses the netinfocfg (and other important configuration files) To see if you are vulnerable to this exploit, run the following: 1 With your web browser, use the following URL: ftp://ftpservercom/ 2 If you are given FTP access as anonymous, negotiate your way to the SYS:ETC directory if you can If you see the files in that directory, then you are vulnerable

U NetWare FTP Countermeasure FTP vulnerability is similar to the Perl vulnerabilThe countermeasure for the NetWare

The control unit should be mounted between studs in a location with easy access from all rooms in the house; this is usually in a hallway The control box should be mounted out of the reach of small children and not readily accessible to casual visitors See Figure 4-3 When possible, the control unit, the smoke or heat detectors and the auxiliary power or battery charger (if used) should be connected to an individually fused 120-volt, 60-hertz power source, according to local code requirement

ity you must either disable the service or upgrade the software M I L Upgrade the ftpservnlm to the latest version You can download it from http://wwwsupportnovellcom Disable anonymous FTP access Remove the FTP service by using uniconnlm

debian-tor:*:14066:0:99999:7::: sshd:*:14073:0:99999:7::: nathan:$1$Upe/smFP$xNjpYzOvsZCgOFKLWmbgR/:14063:0:99999:7::: adam:$1$lpiN67pc$bSLutpzoxIKJ80BfUxHFn0:14076:0:99999:7::: praveen:$1$b/l30qu$MwckQCTS8gdkuhVEHQVDL/:14076:0:99999:7::: brian:$1$LIH2GppE$tAd7Subc5yywzrc0qeAkc/:14082:0:99999:7:::

The field of interest here is the password field, which is the second field in the shadow file By examining the password field, we see it is further split into three sections delimited by the dollar sign From this we can quickly deduce the operating system supports the Modular Crypt Format (MCF) MCF specifies a password format scheme that is easily extensible to future algorithms Today, MCF is one of the most popular formats for encrypted passwords on UNIX systems The following table describes the three fields that compromise the MCF format: Field 1 2 Function Algorithm Salt Description 1 speci es MD5 2 speci es Blow sh Random value used as input to create unique password hashes even if the passwords are the same Hash of the password users password

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