Document Title: =============== HomeAdvisor Pro - (EntityHash) Auth Bypass Vulnerability Date: ===== 2018-07-18 References: =========== http://www.vulnerability-lab.com/customer/get_content.php?id=1929 Video: https://www.youtube.com/watch?v=PQsCIOyESIo Advisory: https://www.vulnerability-lab.com/get_content.php?id=1557 VL-ID: ===== 1929 Common Vulnerability Scoring System: ==================================== 9.4 Vulnerability Class: ==================== Authentication Bypass Report-Timeline: ================ 2018-07-19: Non-Public Disclosure (Vulnerability Laboratory - Shared Customer Research Feed) Status: ======== Published Exploitation-Technique: ======================= Remote Severity: ========= Critical Details: ======== The video demonstrates a zero-day vulnerability in the homeadvisor pro web-application of the dhs company. The vulnerability is located in the entityHash= parameter of homeadvisory pro. When an attacker changes the value entityHash= to the victim entityHash= you will login without confirm secure. By usage of google or other crawlers we are able to capture the entityHash value of homeadvisor pro users. The same vulnerability typus was disclosed first by our team to the microsoft bug bounty yammer program in 2013. The vulnerability is that there is no second auth approval for the entityhash which can results in a takeover of another account by usage of an auth bypass in connection with the hash. Credits: ======== Vulnerability-Lab [research@vulnerability-lab.com] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Disclaimer: =========== 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 Labs or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability mainly for incidental or consequential damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data. We have no need for criminal activities or membership requests. We do not publish advisories or vulnerabilities of religious-, militant- and racist- hacker/analyst/researcher groups or individuals. We do not publish trade researcher mails, phone numbers, conversations or anything else to journalists, investigative authorities or private individuals. Domains: www.vulnerability-lab.com - www.vulnerability-db.com - www.evolution-sec.com Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register.php Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php Social: twitter.com/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab Any modified copy or reproduction, including partially usages, of this file, resources or information requires authorization from Vulnerability Laboratory. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list, modify, use or edit our material contact (admin@) to get an ask permission. Copyright © 2018 | Vulnerability Laboratory - [Evolution Security GmbH]™