PNGƒJƒEƒ“ƒ^+—pƒƒO‰ƒXƒNƒŠƒvƒg remote commands execution vulnerability

From: <blahplok_at_yahoo.com>
Date: 7 Jul 2005 14:02:21 -0000

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Vendor URL : http://www.aurora.dti.ne.jp/~zom/Counter/
Vulnerability : Remote Command Execution
Risk : High

==================================================================
An attacker may exploit this vulnerability to execute commands on
the remote host by adding special parameters to Kaiseki.cgi script.

Problem:

There is no filtering special character when open file in sub ReadLog.
Vulnerable code :

sub ReadLog
{
.......
.......

        $imaLog = $$log;
        if(!open(IN, "./$main::logdir/$imaLog"))
        {
.......
.......
}

Fix :

add :
$$log =~ s/[;<>\*\|'&\$!?#\(\)\[\]\{\}:'"\\]//go;

before :
$imaLog = $$log;
if(!open(IN, "./$main::logdir/$imaLog"))
{
.....
}

Example exploitasion :

http://[target]/cgi-bin/kaiseki.cgi?file.exetension|command|
or
http://[target]/cgi-bin/kaiseki.cgi?|command|

June 2005 : bug found
July 7 2005 : vendor contact
July 7 2005 : Vendor respon
July 2005 : ----------

==================================================================

by blahplok
Received on Jul 07 2005